AmeriDendro 2013 registration is open: follow the link on the Overview page.
13-17 May 2013
Tucson, Arizona
US/Arizona timezone
Home > Contribution List
Displaying 231 contributions out of 231
Type: Oral Presentation Session: Climate of Recent Millennia I
Track: Climate of recent millennia
We present two reconstructions of annual average temperature over temperate North America: a tree-ring based reconstruction at decadal resolution (1200–1980 CE) and a pollen-based reconstruction at 30-year resolution that extends back to 480 CE. The tree-ring based reconstruction was calibrated against instrumental temperatures, was then reduced to a lower resolution and used as a calibration t ... More
Presented by Dr. Valerie TROUET on 14 May 2013 at 14:50
Type: Oral Presentation Session: Dendroecology I
Track: Dendroecology
A persistent challenge in tree-ring analysis is the extraction of a specific signal in the presence of other embedded signals. Overcoming this challenge is particularly important in closed-canopy forests where a substantial change in light availability between understory and overstory environments, in addition to growth and climate signals, affects tree growth rates. This presentation introduces ... More
Presented by Dr. Daniel DRUCKENBROD on 14 May 2013 at 11:15
Type: Poster Presentation Session: Poster Session + Reception
The Tropical Pacific region in Colombia is the rainiest in America. Short and scarce instrumental meteorological data are a frequent drawback in South America. Tropical dendrochronology can potentially provide long-term climatic records extremely needed considering first, the lack of climatic data for feeding the global climate models for this region, and second, the high ecosystem and population ... More
Presented by Dr. Laia ANDREU-HAYLES on 15 May 2013 at 18:00
Type: Invited Talk Session: Invited Speaker + Plenary Session (Decison Making)
Track: Science and decision making
South America is the only landmass in the Southern Hemisphere that extends from the tropics through the mid-latitude Westerlies to the subantarctic domains at ~55˚S. Stretching N-S over a 65° latitudinal transect, dendrochronological records in South American offer unique opportunities to study the interlinked low- and high-latitude processes influencing climate in the Southern Hemisphere and ... More
Presented by Dr. Ricardo VILLALBA on 15 May 2013 at 08:00
Type: Poster Presentation Session: Poster Session + Reception
In central New York State, southeast of Lake Ontario, the relationship between summer temperature and relative humidity recorded in tree rings and their 13C isotope content indicate oscillations between a dry-cold regime and a wet-cool regime at the end of the Younger Dryas. This record corroborates with that found in boreal environments today, with the exception of frequency - the seesaw in the Y ... More
Presented by Carol GRIGGS on 15 May 2013 at 18:00
Type: Oral Presentation Session: Dendroclimatology I
Track: Dendroclimatology
A vital component of dendroclimatology is the validation of reconstructions. Given the scant instrumental data prior to the 20th century, the validation of dendroclimatological reconstructions largely depends on other proxy-inferred climate reconstructions. Here we compare a three-century tree-ring inferred central Minnesota moisture reconstruction based upon sites in Minnesota (e.g. Itasca Park) ... More
Presented by Dr. Jeannine-Marie ST. JACQUES on 15 May 2013 at 10:00
Type: Poster Presentation Session: Poster Session + Reception
With the goal of better managing land used by the Indiana Bat (Myotis sodalis), we study both tree-level and stand-level characteristics on a mitigation property in Plainfield, Indiana. In this study we explore factors in the life of trees that might affect their quality as a roosting site (e.g. time since mortality, season of mortality, and type of mortality event such as senescence or disturban ... More
Presented by Mr. Joseph PETTIT on 15 May 2013 at 18:00
Type: Oral Presentation Session: Climate Growth Relations II
Track: Climate-growth relationships
Climate-growth relationships have typically been described for mean chronologies at the stand or larger spatial scales, either as a basis for subsequent reconstruction of past climatic variability, or to better understand environmental controls on tree growth. However, accurately forecasting forest responses to future climate change may require a better understanding of variability in tree growth ... More
Presented by Dr. David W. PETERSON on 14 May 2013 at 10:55
Type: Poster Presentation Session: Poster Session + Reception
Reconstruction of past climate using standardized ring measurements enables an examination of the modern climate in the context of the last several hundred, and in some cases, thousand years. We have generated the first precipitation reconstruction for the Upper Arkansas River basin from Pinus aristata (Rocky Mountain Bristlecone Pine) at Black Mountain in central Colorado. The reconstruction, whi ... More
Presented by Kyle R. MILLER on 15 May 2013 at 18:00
Type: Oral Presentation Session: Network Analysis
Track: Tree-ring network analysis
The Fire and Climate Synthesis (FACS) project is a collaboration of about 50 fire ecologists to compile and synthesize fire and climate data for western North America. We have compiled nearly 900 multi-century fire-scar based fire histories from the western United States, Canada, and Mexico. The resulting tree-ring based fire history is the largest and most spatially extensive in the world, consis ... More
Presented by Dr. Donald FALK on 15 May 2013 at 17:10
Type: Oral Presentation Session: Fire Ecology III
Track: Fire ecology
Recent extreme wildfires have grown larger and burned more severely in forests adapted to frequent, low-severity fire. To investigate the spatial fuel-topography linkages which may influence extreme wildfire size, we reconstructed fire history using fire-scarred trees in a ponderosa pine forest in Black Canyon/Little Tesuque Watershed, Sangre de Cristo Mountains, New Mexico. We compared fire inter ... More
Presented by Laura MARSHALL on 16 May 2013 at 13:00
Type: Poster Presentation Session: Poster Session + Reception
Recently yew (Taxus baccata) has shown promising potential to be used in dendrochronological and dendroclimatological analysis in Ireland, western Himalaya and England. So far however, few studies on yew dendrochronology and dendroclimatology exist. The potential for obtaining long yew chronology with strong response to climatic variables are the main reasons of this research. Yew is native to Eur ... More
Presented by Ms. Beheshteh AGIN on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Drought has significant impacts on domestic use, agriculture, and ecosystems in Tanzania and is a major seasonally occurring stress factor in water resources management. Water shortage is projected to increase with globally rising temperatures and this will likely be one of the major limitations for future development in Tanzania. Instrumental records of drought variability are sparse in Tanzania ... More
Presented by Ms. Zakia Hassan KHAMISI on 15 May 2013 at 18:00
Type: Oral Presentation Session: Dendroclimatology I
Track: Dendroclimatology
In a closed-canopy forest, stand dynamics play an important role in shaping the forest, and it has been hypothesized that dense forests are not sufficiently limited by climate to warrant climate reconstruction. We sample Quercus prinus ring-widths from a dense forest in the Appalachians, and after removal of stand dynamics and age trends we find strong correlations between the developed chronology ... More
Presented by Andria DAWSON on 15 May 2013 at 10:20
Type: Oral Presentation Session: Wood Anatomy
Track: Wood anatomy
Human auditory perception can be used to exploit and understand natural time series with sound. Dendrochronology is uniquely equipped with methods and abundant time sensitive data for translating science with acoustic illustrations. The neurology of human hearing offers distinct advantages in perceiving scientific data and analyses when compared to graphic illustration. Perceiving time series of ... More
Presented by Prof. Richard GUYETTE on 15 May 2013 at 11:20
Type: Poster Presentation Session: Poster Session + Reception
Track: Science and decision making
Successful dissemination of scientific knowledge in a format accessible to the general public is a major contemporary concern, especially concerning issues that impact all people such as wildfire and climate change. This knowledge gap creates a divide between scientific communities and educational systems, limiting dialogue concerning viable environmental solutions. In 2012, LTRR initiated colla ... More
Presented by Mr. Joshua FARELLA on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Previously reported dendrochemical data showed temporal variability in concentration of tungsten (W) and cobalt (Co) in tree rings of Fallon, Nevada, US. Since then, intertree variability was calculated for each measured element across trees within subsites and time periods. For W and Co, the metals of highest interest in Fallon, inter-tree variability was always higher within versus outside of Fa ... More
Presented by Dr. Paul R. SHEPPARD on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
A historic barn near Edmonton, Alberta, is thought to have contained extant timbers from Fort Edmonton, the Hudson Bay Trading Post constructed in 1795 and dismantled in 1915. When the barn was demolished a few years ago, the Alberta Royal Museum salvaged and archived these timbers. In 2012, they contracted the University of Regina Tree-Ring Lab to determine the age of the timbers, as further evid ... More
Presented by Mr. James DICKENSON on 15 May 2013 at 18:00
Type: Oral Presentation Session: Climate Growth Relations II
Track: Climate-growth relationships
Previous research shows that droughts lead to multi-year decreases in the growth of western Canadian aspen forests. We postulated that this is partly a consequence of aspen responding directly to slow variation in the water content of deep soils in this dry region. To address this hypothesis, a soil moisture (SM) model was developed that requires only basic climatic inputs. The model successfull ... More
Presented by Dr. E.H. (Ted) HOGG on 14 May 2013 at 11:15
Type: Oral Presentation Session: Invited Speaker + Plenary Session (Decison Making)
Track: Science and decision making
Our network of 170 moisture-sensitive tree-ring chronologies is the basis for millennial reconstructions of surface water levels across Canada’s western interior, where water is limiting ecologically and economically. This paleohydrology undermines fundamental assumptions about the reliability and stationarity of water supplies, by revealing scales and extremes of hydroclimatic variability outs ... More
Presented by Dr. Dave SAUCHYN on 15 May 2013 at 09:20
Type: Poster Presentation Session: Poster Session + Reception
A method based on a feature of wood anatomy: tree-ring eccentricity was developed to analyze the spatial and temporal variability of landslide activity. The degree of eccentricity is used as an indicator of the intensity of the mechanical stress affecting a stem in a certain year. The uneven distribution of strains in a stem of Norway spruce tilted by ground instability causes more intensive growt ... More
Presented by Ms. Małgorzata WISTUBA on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Studies on long-term sea cliff morphology typically use historical maps, aerial photographs or Lidar data to determine cliff retreat. In this study, anatomical changes in 58 exposed roots of Pinus halpensis were used to quantify retreat of decametric sandstone cliffs on Porquerolles Island (France). At the plot scale, average medium-term soil erosion rates derived from exposed roots was 20 mm yr ... More
Presented by Dr. Christophe CORONA on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Araucaria angustifolia is a native subtropical coniferous species of southern Brazil. Previously published 14C measurements on selected annual growth rings confirmed the overall profile of the Southern Hemisphere (SH) of the “bomb-pulse”, suggesting that using an annual resolution of this long-lived species for the construction of a calibration chronology curve was promising. This work reports ... More
Presented by Dr. Guaciara M. SANTOS on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Dendrogeomorphology has been demonstrated to be a valuable tool for studying hydrogeomorphic processes in ungauged or poorly catchment. However, an appropriate knowledge of the response of trees to these processes is crucial for proper interpretation of dendrochronological signal. In this communication, we present results from the study of damages riparian trees (Alnus glutinosa, Fraxinus angustif ... More
Presented by Dr. Juan Antonio BALLESTEROS CANOVAS on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
In the central rainforest of Peru, the tree rings have not been used to obtain data from tree growth, although their application may be useful for forest management. The objective of this study was to determine the Biological Harvesting Rotation of Juglans neotropica from the analysis of tree-rings growth. For this purpose samples were collected from 64 trees from the forests of the Native Communi ... More
Presented by Ms. Janet Gaby INGA GUILLEN on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
The root system is often neglected in the study of the effect of commercial thinning, even though it plays a great part in the success of the treatment. The research aims to compare the growth response in the stem and roots after commercial thinning. Six black spruce (Picea mariana) stems and their root system were sampled within three commercial thinning stands in the boreal forest. Thinning occu ... More
Presented by Audrey LEMAY on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
This poster shows the study design and preliminary results of a fire history and stand dynamics study in a Great Basin bristlecone pine forest at Mount Washington, Nevada. This forest has experienced a recent high severity fire enables us to directly examine fire effects in bristlecone pine. The research plan includes mapping fire boundaries via ground mapping and remote sensing, measuring vegetat ... More
Presented by Mackenzie KILPATRICK on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Large, old western redcedar trees provide a wide range of ecological functions and are an integral part of coastal First Nations’ culture in British Columbia. Redcedar bark is commonly removed from tree trunks and used in baskets, hats and clothing. The surviving tree forms a permanent scar that can be crossdated to determine the year of past cultural modifications. We have developed multi-cen ... More
Presented by Ashley DOBKO on 15 May 2013 at 18:00
Type: Invited Talk Session: Invited Speaker + Plenary Session (Dendroecology)
Track: Dendroecology
Xylogenesis can provide valuable insight into the causal link between wood production, phenological traits of trees, and environment by gathering specific and detailed information like (1) the onset or (2) ending of cambial activity and xylem cell differentiation, (3) changes in cell number, size and shape, and (4) rates of change of the processes. The variability in the growth timings and dynamic ... More
Presented by Dr. Annie DESLAURIERS on 16 May 2013 at 08:00
Type: Oral Presentation Session: Dendrohydrology
Track: Dendrohydrology
Tilted trees have been widely used to date past hydrogeomorphic events. However, their usefulness to derive flood discharge has never been explored. We present a mechanical tree deformation–flood depth model to reconstruct flood peak discharge based on the rotational stem deformation. We combined dendrogeomorphic techniques, mechanic-structural and hydraulic approaches for this purpose. In addit ... More
Presented by Dr. Juan Antonio BALLESTEROS CáNOVAS on 17 May 2013 at 11:50
Type: Oral Presentation Session: Isotopes in Dendrochronolgy
Track: Isotopes in dendrochronology
A geochemical model involving meteorological parameters that govern physiochemical fractionation of carbon isotopes during cellulose production in tree rings has been developed. This model is able to extend the atmospheric partial pressure of carbon dioxide (Ca) data in the tropics and northern sub-tropics at 10 sites to the first decade of the last century where no Ca data were available before 1 ... More
Presented by Ms. Trina BOSE on 17 May 2013 at 09:10
Type: Poster Presentation Session: Poster Session + Reception
A network of 73 upper elevation white spruce chronologies was developed from treeline sites across the Yukon Territory. PCA of standard ring-width chronologies indicate a strong common growth pattern (50 sites, 57.3% of variance) loading on PC1 during the 1900-1950 period but varied patterns over the 1951-2000 interval when 22, 19 and 14 chronologies load on the first 3 PCs respectively (67.8% cu ... More
Presented by Mr. David S. MORIMOTO on 15 May 2013 at 18:00
Type: Oral Presentation Session: Fire Ecology II
Track: Fire ecology
We have compared fire history and forest dynamics in the East versus West Kootenay areas of southeastern British Columbia. In both areas, fire regimes varied significantly with steep elevational gradients. At high elevations, stand-replacing fires burned every 150-300 years according to our fire scar, forest age structure and lake sediment records. In the lower-elevation forests, low-severity fire ... More
Presented by Lori DANIELS on 16 May 2013 at 10:40
Type: Poster Presentation Session: Poster Session + Reception
Given the expected sensitivity of radial growth of trees near altitudinal treeline to global warming, we examined recent variability in growth of Nothofagus pumilio in monospecific stands near altitudinal treeline on Choshuenco Volcano (40oS latitude) in Chile. Preliminary results based on a chronology of 99 tree-ring series for the period from 1768 to 2010 yielded a mean series intercorrelation ... More
Presented by Mr. Claudio ALVAREZ on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Documenting historical fire regimes provides an unparalleled view of ecosystem function across spatiotemporal scales. We analyzed fire-scars and tree demography in a multiscale dendrochronological study from a network of sites in central and eastern Oregon. We sampled over 6000 trees for tree-establishment dates in ponderosa pine, dry and mesic mixed conifer, and lodgepole-ponderosa pine communiti ... More
Presented by Dr. Donald FALK on 15 May 2013 at 18:00
Type: Oral Presentation Session: Dendroecology I
Track: Dendroecology
Outbreaks of the western spruce budworm (WSB) often occur synchronously over broad regions of western North America. In spite of the ecological and economic significance of this species, the mechanisms controlling its population dynamics are still not fully understood. In this study, dendrochronological methods were used to reconstruct multi-century records of WSB outbreaks at thirteen sites along ... More
Presented by Ms. Aquila FLOWER on 14 May 2013 at 11:55
Type: Poster Presentation Session: Poster Session + Reception
The aim of this study is to evaluate the relationships between apical (primary) and radial (secondary) growth as well as the influences of climate variations on both apical and radial growth in a native forest of Nothofagus pumilio in the north Patagonia Andes. Ring widths and the lengths and number of internodes per annual shoot for the interval 2001-2010, were measured in 40 individuals of N. pu ... More
Presented by Mr. Amaru MAGNIN on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
With the objective to increase the network of climate-sensitive chronologies in Mexico, the dendroclimatic potential of Pinus cooperi a conifer species distributed in the western section of Durango, Mexico was analyzed. Increment cores were taken from selected trees along an altitudinal gradient (2300 to 2900 m). Increment core samples were successfully dated by standard dendrochronological techni ... More
Presented by Ms. Julián CERANO-PAREDES on 15 May 2013 at 18:00
Type: Oral Presentation Session: Network Analysis
Track: Tree-ring network analysis
A network of ten ring-width chronologies of Pinus hartwegii a treeline species was developed from conifer stands at the Eastern Sierra Madre (ESM) and the Trans-Mexican Volcanic Belt (TVB) in the Valley of Mexico where the species was present. The PCA grouped the chronologies into two main components, PC1 for TVB and PC2 for ESM chronologies. ENSO in its warm phase (El Niño) and cold phase (La Ni ... More
Presented by Dr. Jose VILLANUEVA-DIAZ on 14 May 2013 at 16:10
Type: Poster Presentation Session: Poster Session + Reception
Quercus douglasii (blue Oak) tree-ring cellulose δ18O in southern California contains a memory of the interannual variability in precipitation δ18O via soil water δ18O. Combined, soil water δ18O and cellulose δ18O provide insights into regional hydrologic variability that may be caused by distinct atmospheric dynamics. In the late 20th century, years with uniquely low cellulose δ18O are as ... More
Presented by Dr. Lisa KANNER on 15 May 2013 at 18:00
Type: Oral Presentation Session: Fire Ecology I
Track: Fire ecology
Piñon-juniper (PJ) fire regimes are described as infrequent and high severity, but data for PJ savannas are lacking. The goal of my research was to reconstruct the history of fire and forest structure on a 30,000 ha PJ-dominated, savanna landscape. I crossdated 112 fire-scarred trees (8% Juniperus scopulorum, 17% Pinus edulis, and 74% P. ponderosa) containing 630 fire scars that burned during 87 ... More
Presented by Dr. Ellis MARGOLIS on 14 May 2013 at 10:10
Type: Poster Presentation Session: Poster Session + Reception
Long-term demographic datasets of tree populations improve our understanding of forest response to climatic fluctuation and change. Excellent preservation of remnant wood on the Tavaputs Plateau in northeastern Utah provides the opportunity to investigate population dynamics of Colorado pinyon (Pinus edulis), and its relation to climate variability over multiple centuries. From a sample of 597 p ... More
Presented by Dr. Troy KNIGHT on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Non-random sampling protocols and differences in mortality between trees of different growth rates has been suggested to cause widespread, systematic bias in dendrochronological reconstructions of tree growth, a phenomenon known as modern sample bias. By making explicit the model of tree growth used in regional curve standardization, it becomes evident that tree ring data can be stored and manipul ... More
Presented by Mr. Jacob CECILE on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Fire scars in tree rings are commonly used to reconstruct fire frequency, but reconstructing spatial variability of fire regimes can be challenging. Spatially explicit fire models provide a great new opportunity to study fire at landscape scales, but can rarely be tested against real fires. In this study, I corroborate tree-ring reconstructed and modeled conditional burn probability for a 30,000 ... More
Presented by Dr. Ellis MARGOLIS on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Permineralized (fossilized or 'petrified') wood from many sites around the world can exhibit an incredible degree of preservation, including intact cell structure and sub-cellular features. Yet previous attempts to use traditional dendrochronology on such material have met with only limited success. Here we present the results of ring width analyses of fossil wood samples from two mid-Miocene loca ... More
Presented by William WRIGHT on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
The indigenous use of bark and cambium harvested from trees has been documented world-wide for centuries, especially in northern latitudes and in western regions of North America, including the Pacific Northwest, the Southwest, and portions of western Montana, Idaho, and Canada. However, there remain substantial portions of western North American where indigenous use of tree resources is largely u ... More
Presented by Marcy REISER on 15 May 2013 at 18:00
Type: Oral Presentation Session: New World Dendroarchaeology
Track: New World dendroarchaeology
The indigenous use of trees has been well-documented in western North America, but not in northern Colorado. We present data from 37 trees likely peeled by Native Americans between 1605 and 1812 CE, based on dendrochronological analysis of scars. All trees were ponderosa pines between 1740 and 2788 m elevation and were located serendipitously during the course of fire history studies. They occured ... More
Presented by Ms. Marcy REISER on 16 May 2013 at 13:20
Type: Oral Presentation Session: New World Dendroarchaeology
Track: New World dendroarchaeology
Brush structures are the remains of traditional housing used by the Southern Tutchone people in the forests of the South West Yukon. They are frameworks of wooden poles, usually ca. 10-25cm diameter cut from the trunks of local spruce trees and provided temporary shelter for families or small itinerant groups. Five groups of structures were examined on the alluvial fan of Vulcan Creek, a tributary ... More
Presented by Dr. Brian LUCKMAN on 16 May 2013 at 13:40
Type: Poster Presentation Session: Poster Session + Reception
The Bridger Antelope Trap is an archaeological site in southwestern Wyoming that was used by American Indians while hunting antelope (Antilopcapra americana). The trap is a large corral constructed from Utah juniper (Juniperus osteosperma) covering 110,000 m2. The primary purpose of the project was to provide information about when the trap was built and used. The juniper wood contained numerous m ... More
Presented by Dr. Jim SPEER on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
A 570-year floating tree-ring-width chronology was built from samples of in situ forests and detrital logs of 27 trees from a tributary valley of Wachusett Inlet in Glacier Bay National Park and Preserve. Calibrated radiocarbon dates provide absolute ages for the ring-width series and stratigraphic analyses show that the trees were killed by a series of ice advance-related sedimentation events at ... More
Presented by Sarah APPLETON on 15 May 2013 at 18:00
Type: Oral Presentation Session: Recent Growth Trends and Tree Mortality
Track: Recent growth changes and tree mortality
In California’s southern Sierra Nevada, air pollution in the form of ozone is a major ecosystem stressor. Additionally, climatic shifts are expected to exacerbate drought in the region, including in forests throughout Sequoia/Kings Canyon National Parks. In order to describe response to these compound stressors, our study asks: is the growth signature of drought in pine forests detectable, consi ... More
Presented by Stella COUSINS on 16 May 2013 at 15:40
Type: Oral Presentation Session: New World Dendroarchaeology
Track: New World dendroarchaeology
Recent research in the Bolivian Altiplano of the Central Andes has yielded a network of Polylepis tarapacana chronologies that go back to the 13th century. This wood was regularly used by local populations in pre-Columbian times as raw material for beams, lintels, hooks and other architectural features in houses, chambers, and sepulchers. This study evaluated the potential of P. tarapacana samples ... More
Presented by Dr. Mariano MORALES on 16 May 2013 at 14:20
Type: Poster Presentation Session: Poster Session + Reception
Almost 100 years ago, the astronomer Andrew Ellicott Douglass of the University of Arizona received archaeological tree-ring samples from archaeologists working in northwestern New Mexico. Although it took Douglass—in collaboration with many archaeologists—another 15 years, he ultimately laid the foundation for the most accurate and precise prehistoric cultural chronology in the world. Since D ... More
Presented by Ronald TOWNER on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Dendroarchaeology was used to interpret the history of two historic structures in the Valles Caldera National Preserve of New Mexico. Historical documents date some structures in the preserve, but a commissary cabin and a salt barn were lacking conclusive construction dates. Two tree species, Abies concolor (white fir) and Pseudotsuga menziesii (Douglas-fir), were represented by the cores extracte ... More
Presented by Kristen DE GRAAUW on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
In past dendrogeomorphological research on pines growing around the Mexican cinder cone called Parícutin, it was noticed that most of the trees sampled showed reduced ring widths from 1970 to 1974. That tree-ring signal was due not to the volcano but rather to an outbreak of an insect defoliator. Dendrochemistry was tried on selected tree-ring samples to see if the known defoliation caused chan ... More
Presented by Dr. Paul R. SHEPPARD on 15 May 2013 at 18:00
Type: Oral Presentation Session: New World Dendroarchaeology
Track: New World dendroarchaeology
Although dendrochronology has been used to date ships throughout the world, it has not yet been used in South American nautical archaeology. In 2008, workers digging foundations of an apartment complex in Puerto Madero, Buenos Aires, uncovered the remains of a wooden-hulled vessel. Archaeological evidence indicated that this vessel might be an 18th century Spanish ship. Dendrochronology was used t ... More
Presented by Dr. Ignacio MUNDO on 16 May 2013 at 14:00
Type: Poster Presentation Session: Poster Session + Reception
On July 2010, archaeologists encountered the intact remains of a ship’s hull in lower Manhattan. Because the date of construction and origin of the timbers were unknown, samples from different parts of the ship were for dendrochronological dating and provenancing. After building a floating chronology from the extracted white oak samples, absolute dating and provenance was evaluated against 21 oa ... More
Presented by Dr. Dario MARTIN-BENITO on 15 May 2013 at 18:00
Type: Oral Presentation Session: Old World Dendroarchaeology
Track: Old World dendroarchaeology
Mining on copper ore in the Northern Alps of Austria has been well known for a long time. Trace element analyses on metallic artefacts prove that copper from this region was important for whole central Europe during Bronze Age. However, accurate dating of the mining activities was poor both regarding absolute age determination and duration of mining at a certain place, i.e. dating was based on fin ... More
Presented by Dr. Kurt NICOLUSSI on 16 May 2013 at 16:20
Type: Poster Presentation Session: Poster Session + Reception
The presented preliminary studies are a part of interdisciplinary project on recognition of mechanisms and effects of human influence and natural factors on the alpine ecosystems in context of continental arid climate of Central Asia. The study area is located in the Fann Mts, at the contact of the Zarafshan and the Gissar ranges, Western Pamir-Alay. Based on field reconnaissance the following spe ... More
Presented by Dr. Magdalena OPAłA on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
As a result of a favorable preservation and the ancient Egyptian practice of ritually provisioning individuals for the afterlife, hundreds of tons of wood have been recovered from archaeological excavations in Egypt. Ancient ships, coffins, furniture and architectural timbers provide a potentially robust source of material for dendrochronological investigations. As early as 1932, A.E. Douglass was ... More
Presented by Rebecca CAROLI on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
In August of 1964 a large bristlecone pine (Pinus longaeva) in the Snake Range of Nevada was cut down by Donald Currey, then a graduate student at the University of North Carolina. In the immediate aftermath of this unfortunate incident a counting of rings indicated the tree to be of record setting age: 4,844 years (later revised by D. Graybill to 4,862 years). However, these were estimates based ... More
Presented by Matthew SALZER, Chris BAISAN on 15 May 2013 at 18:00
Type: Oral Presentation Session: Fire Ecology III
Track: Fire ecology
We reconstructed the fire history in three tributary basins of the San Juan Mountains in Colorado. Fire-scarred trees and age-structure data yielded a chronology of surface fire years, along with estimates of high-severity burned area for the past ~ 400 years. In each basin, fire history and forest composition were strongly influenced by aspect. The south-facing slopes were dominated by pondero ... More
Presented by Ms. Erica BIGIO on 16 May 2013 at 13:20
Type: Oral Presentation Session: Network Analysis
Track: Tree-ring network analysis
Dendroclimatic analyses are being conducted on over 200 tree-ring width and density chronologies collected from subalpine fir (Abies lasiocarpa), mountain hemlock (Tsuga mertensiana), and white spruce ( Picea glauca) trees from high elevation sites located throughout the Coast Mountains of British Columbia, Canada. The data are assessed to evaluate spatiotemporal variability in the strength and na ... More
Presented by Ms. Bethany COULTHARD on 14 May 2013 at 16:50
Type: Oral Presentation Session: Dendroecology II
Track: Dendroecology
Despite decades of tree-ring research, it is not evident how anthropogenic climate change will impact the growth of most species. We cored 953 Pinus rigida trees from 27 seed sources planted in New Jersey as a part of a long-term provenance study. Dendroecological analyses of these sources, derived from Maine to Georgia, are being used to help develop tools for the selection and management of futu ... More
Presented by Caroline LELAND on 14 May 2013 at 15:10
Type: Oral Presentation Session: Welcome + Plenary Session (Ecology)
Track: Dendroecology
The roots of dendrochronology reflect the essential nature of our field. In 1929 an astronomer interested in solar variability and its influence on terrestrial processes (A.E. Douglass) made a great breakthrough in archaeological dating, and thereby established a method subsequently applied worldwide in archaeology, climatology, geology, and ecology. The relevance and need for multi-disciplinary a ... More
Presented by Prof. Thomas SWETNAM on 14 May 2013 at 08:55
Type: Poster Presentation Session: Poster Session + Reception
Changing climatic conditions and volcanic activity on the Kamchatka Peninsula have triggered a large number of devastating volcanic debris flows (lahars), which have the potential to develop considerable reach and devastate populated areas. While there are complete records of the past decades for volcano eruptions around the village of Klyuchi, lahars have only been recorded when infrastructure wa ... More
Presented by Mrs. Annina SORG on 15 May 2013 at 18:00
Type: Oral Presentation Session: Dendrohydrology
Track: Dendrohydrology
The northern foothills of the Tatra Mountains are among the most densely populated regions in Poland, but also the source area of the large floods of the recent past. In this contribution, we reconstruct a detailed database on the history, magnitude and triggers of floods. The dendrogeomorphic work presented focuses on four streams, in which six sectors have been sampled with more than 1100 increm ... More
Presented by Dr. Ryszard Jerzy KACZKA on 17 May 2013 at 11:10
Type: Oral Presentation Session: Dendrogeomorphology
Track: Dendrogeomorphology
Historical ice front recession and downwasting of glaciers in the in the Monarch Icefield area has exposed landforms covered until recently by glaciers. Jacobsen Glacier is a large northeast flowing outlet glacier that has retreated over 6 km since 1915. In July 2010 the remnants of standing forests overwhelmed and buried by the mid-Holocene expansion of Jacobsen Glacier were located close to ice ... More
Presented by Jill HARVEY on 17 May 2013 at 14:10
Type: Oral Presentation Session: Dendroecology II
Track: Dendroecology
To estimate the potential changes global warming will impose on the structure and growth of Nothofagus pumilio forests along elevational gradients and different aspect. Structural traits and tree-ring growth patterns were analyzed at three elevational points with different exposures. Along gradient, height and diameter decreased. Tree growth trends over the past 120 years show that low-elevation f ... More
Presented by Dr. Ana SRUR on 14 May 2013 at 14:50
Type: Poster Presentation Session: Poster Session + Reception
Tangential rows of traumatic resin ducts (TRDs) are reliable indicators of injury from geomorphic disturbance in conifer species such as Pseudotsuga, Picea and Larix, but very limited research on Abies species suggests that they produce TRDs only rarely and very close to the wound. We documented the strength, tangential (%) and radial (years) extent, and position within the growth ring of TRDs in ... More
Presented by Dr. Matthew BEKKER on 15 May 2013 at 18:00
Type: Oral Presentation Session: Isotopes in Dendrochronology II
Track: Isotopes in dendrochronology
We established annual tree-ring δ18O and δ13C chronologies using Tianshan spruce (Picea schrenkiana) in the central Tianshan Mountains of China. Temperature has positive effect on tree-ring δ18O and δ13C in study area, while precipitation and relative humidity have negative effects. The standardized precipitation-evapotranspiration index (SPEI) considered all of these effects and was significa ... More
Presented by Dr. Guobao XU on 17 May 2013 at 11:50
Type: Oral Presentation Session: Old World Dendroarchaeology
Track: Old World dendroarchaeology
We present the first annually resolved and absolutely dated dendroarchaeological findings of four water well constructions from East Germany that survived in a waterlogged environment for 7200 years. The completely excavated well linings reveal an unexpectedly high caliber of carpentry skill. Our results, based on a total of 151 oak timbers that represent the oldest man-made wooden constructions ... More
Presented by Willy TEGEL on 16 May 2013 at 16:00
Type: Oral Presentation Session: Wood Anatomy
Track: Wood anatomy
Previously, mean earlywood vessels lumen area (VLA) in ring-porous species has been shown to contain strong environmental signals. The aim of this study was to determine the response of VLA and tree-ring width (TRW) to climate in two ring-porous species in in Latvia (Europe). VLA was measured from core images (2400 dpi) using WinCELL 2007a program. Monthly precipitation sum and mean monthly temper ... More
Presented by Dr. Didzis ELFERTS on 15 May 2013 at 10:40
Type: Poster Presentation Session: Poster Session + Reception
This study, as part of the 22nd annual North American Dendroecological Fieldweek (NADEF), contributed to a new network of monsoon-sensitive latewood width (LW) chronologies in north-central New Mexico while also providing hands-on experience for NADEF participants to learn the fundamental skills of dendrochronology. Participants developed the first EW/LW chronology for Pinus ponderosa in the Jeme ... More
Presented by Christopher GUITERMAN on 15 May 2013 at 18:00
Type: Oral Presentation Session: Dendroclimatology II
Track: Dendroclimatology
The environment influences tree growth on sub-hourly to multi-centennial scales, making mechanistic knowledge of tree-ring formation across this spectrum essential to accurately evaluate response to environmental change. We established a network to observe physiological responses of two conifer species along a 6°C natural warming gradient through weekly assessment of bud phenology and cellular de ... More
Presented by Mr. Gregory KING on 16 May 2013 at 10:00
Type: Poster Presentation Session: Poster Session + Reception
Glacier and treeline fluctuations in the subalpine region of the southern Coast Mountains have been reconstructed using dendroecologic methods. Glaciers in Garibaldi Provincial Park and the Pemberton Icefield allow detailed reconstructions of fluctuations during the past millennium. Glaciers advanced as early as the 11th, reached maxima in the 12th, and retreated in the 13th century. Glaciers reac ... More
Presented by Johannes KOCH on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Since early 20th century, Glaciar Moreno’s experienced successive advances and retreats. During advances it closes the drainage of southern arms of Lago Argentino. Increases in water levels flood Nothofagus forests’ coast and subsequently kills the submerged trees. During ruptures of ice front, the stored water flows rapidly, exposing vast areas to re-colonization. Tree-rings from standing dea ... More
Presented by Ms. Claudia Marcela GUERRIDO on 15 May 2013 at 18:00
Type: Oral Presentation Session: Dendroclimatology II
Track: Dendroclimatology
In order to correctly integrate tree growth parameters at multiple temporal scales in arid and semi-arid mountains, there is now a renewed demand for clearly understanding the physiological mechanisms that control the climatic response of high-elevation conifers. Cellular-level dendroclimatology has already shown great promise, but studies of wood formation are still lacking in the Great Basin. Th ... More
Presented by Dr. Boris DUFOUR, Dr. Franco BIONDI on 16 May 2013 at 10:20
Type: Oral Presentation Session: Climate Growth Relations I
Track: Climate-growth relationships
Tree life-history processes like establishment, growth, and mortality are partially controlled by climate. Even relatively small shifts in climate can influence these processes and may result in shifts of species distributions. Climate change models that address ecosystem impacts simulate these distribution shifts at coarse spatial scales. However, this information lacks utility for resource man ... More
Presented by Mrs. Christina RESTAINO on 14 May 2013 at 09:30
Type: Oral Presentation Session: Recent Growth Trends and Tree Mortality
Track: Recent growth changes and tree mortality
Red spruce (Picea rubens Sarg.) diameter growth in the northeastern United States has decreased since the 1960s due to a combination of factors, including foliar winter injury predisposed by acidic deposition-induced calcium depletion. We assessed the influence of a severe region-wide winter injury event in 2003 on radial growth decline and the subsequent rebound of red spruce growth in stands i ... More
Presented by Ms. Alexandra KOSIBA on 16 May 2013 at 16:00
Type: Oral Presentation Session: Wood Anatomy
Track: Wood anatomy
The western spruce budworm (WSB) is the most destructive defoliator of coniferous forests in western North America. Although numerous studies have reconstructed WSB outbreaks, there has been no prior research on how outbreaks affect the anatomical structure of the stem. In this study we examine the response of Douglas-fir to sustained WSB outbreaks, hypothesizing that anatomical characteristics, e ... More
Presented by Jodi AXELSON on 15 May 2013 at 11:00
Type: Oral Presentation Session: Fire Ecology III
Track: Fire ecology
Fires that injure but do not kill trees cause scars used as proxies for the reconstruction of wildfire history. Understanding about these wildfires – and their relationship to vegetation dynamics and climate –has profoundly affected wildfire and land management policy globally. To better understand scarring in the context of wildfire behavior, landscape and biological processes, and tree spe ... More
Presented by Dr. E.K. SUTHERLAND on 16 May 2013 at 14:20
Type: Oral Presentation Session: Dendroclimatology II
Track: Dendroclimatology
False rings are commonly encountered in conifer species throughout the Southwest and have played an integral part in Southwestern dendrochronology. Indeed, crossdating was developed, in part, to ensure the correct dating of tree-ring samples in the presence of false rings. However, an extensive analysis of potential climate drivers of false-ring formation in Southwest has not yet been conducted. ... More
Presented by Dr. Kiyomi MORINO on 16 May 2013 at 11:00
Type: Poster Presentation Session: Poster Session + Reception
We aim to assess the dendrochronological potential of Pinus oocarpa in eastern Guatemala in semiarid areas and investigate the intra-annual meteorological phenomena that might explain the formation of intra-annual rings. These results are based on the hypothesis that P. oocarpa is producing evident annual tree-rings due to climatic seasonality. This study was located at low latitudes 14º35´ N to ... More
Presented by Mr. Paul SZEJNER on 15 May 2013 at 18:00
Type: Oral Presentation Session: Network Analysis
Track: Tree-ring network analysis
We introduce a novel data set, with unparalleled spatial density, for use as climate proxy data. A subset of ~500 Douglas-fir and pinyon pine tree-ring series collected on a systematic sampling grid by the Forest Inventory and Analysis Program (FIA data) were tested to determine their feasibility as climate proxies. First, we found strong temporal coherence between the FIA data and previously publ ... More
Presented by Dr. R. Justin DEROSE on 14 May 2013 at 16:30
Type: Poster Presentation Session: Poster Session + Reception
Track: Fire ecology
Pine forests of the Southwestern United States were characterized historically by high-frequency low-severity surface fire events evident in the tree-ring record. Twentieth century fire suppression has disrupted these fire regimes in US forests leading to recent unprecedented fire severity and behavior across the Western US. Forests of Northwestern Mexico are similar in both species composition an ... More
Presented by Mr. Alexis ARIZPE on 15 May 2013 at 18:00
Type: Oral Presentation Session: Fire Ecology II
Track: Fire ecology
Wildfires in the boreal forests of Siberia may significantly contribute to global warming through feedbacks related to greenhouse gas emissions. How future warming will affect boreal fire regimes remains uncertain due to a lack of knowledge on the climatic controls of fire. Here we present fire-climate relationships derived from a new set of tree-ring reconstructions of fire history for the Sakha ... More
Presented by Christopher GUITERMAN on 16 May 2013 at 11:20
Type: Oral Presentation Session: Invited Speaker + Plenary Session (Dendroecology)
Track: Dendroecology
We developed a fire history of a portion of the Boundary Waters Cane Area Wilderness in northern Minnesota, USA using more than 70 remnant Pinus resinosa stumps collected within an historic canoe travel corridor in Lac La Croix. Our search builds on the efforts of Heinselman to better understand the relative influence of climate and Ojibwe occupancy patterns on the area’s fire regime. Crossdate ... More
Presented by Dr. Kurt KIPFMUELLER on 16 May 2013 at 09:20
Type: Poster Presentation Session: Poster Session + Reception
In central Canada, information on fire history remains largely anecdotic and long-term reconstructions are rare. In a context where both anthropogenic and climate influences on fire regime have changed (fire suppression remaining the dominant management paradigm) the Canadian National Parks have for mandate to maintain ecological integrity. We present a fire reconstruction derived from jack pine t ... More
Presented by Prof. Jacques TARDIF on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Track: Fire ecology
Little is known about drivers and trends of historic fire regimes in the Araucaria araucana forests of southwestern Argentina. Fire history in these forests was reconstructed by the analysis of 246 fire-scarred partial cross-sections collected at 10 sites in northern Patagonia. Fire chronologies showed an increase in fire occurrence during the nineteenth century and a sharp decrease since the earl ... More
Presented by Dr. Ignacio MUNDO on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Fire is an important process in the boreal forest. Reconstructing fire history is necessary for development of appropriate management strategies. Two approaches well suited to fire history reconstructions are analysis of tree-rings and of lake sediment-charcoal records. In this study, the fire record stored in these two proxies will be analyzed and calibrated to reconstruct recent to millennial fi ... More
Presented by Mr. Justin WAITO on 15 May 2013 at 18:00
Type: Oral Presentation Session: Fire Ecology I
Track: Fire ecology
We reconstructed historical stand structures and fire regimes in mixed conifer forests between 2300 m and 2800 m elevation, spanning the last 1000 years. A mixed-severity disturbance regime maintained a spatial and temporal landscape mosaic. Dominance fluctuated between ponderosa pine and lodgepole pine. Before ~1350 C.E., higher elevations were dominated by ponderosa pine and surface fire regimes ... More
Presented by Ms. Laurie HUCKABY on 14 May 2013 at 09:30
Type: Poster Presentation Session: Poster Session + Reception
The partial cross-section (PCS) method is a proven technique to obtain fire-scar samples while ensuring the trees survive, as long as specific perimeter and cross-sectional area thresholds are not exceeded. In this study, we examine the success of the PCS method in obtaining fire scar information from trees. Using a GIS, we digitized 230 images of full cross-sections from fire scarred western larc ... More
Presented by Gregory GREENE on 15 May 2013 at 18:00
Type: Oral Presentation Session: Fire Ecology II
Track: Fire ecology
Fire is a major disturbance agent in North American forests. Fires injure trees when heat transfer through the bark partially kills the cambium and the compartmentalization process results in a fire scar. Dendrochronologists use these scars in the xylem to reconstruct fire regimes. However, little information exists on the wood anatomy of fire scars. Consequently, this study quantifies changes in ... More
Presented by Dr. Estelle ARBELLAY on 16 May 2013 at 10:20
Type: Oral Presentation Session: Dendrohydrology
Track: Dendrohydrology
Flash floods represent significant natural hazards in the Patagonian Andes causing destruction of buildings and infrastructure. In this region, historical records of past events tend to be short, scarce and fragmentary. This lack of information results in a higher regional vulnerability against flash floods. Dendrogeomorphology is an accurate method for spatially and temporally reconstructing torr ... More
Presented by Dr. Alejandro CASTELLER on 17 May 2013 at 11:30
Type: Poster Presentation Session: Poster Session + Reception
Riverine floods have been analyzed using a variety of floodplain-based and dendrogeopmorphic approaches. This study takes a "mechanistic" weather-based approach to explore the degree to which flood events are detectable in time series of observed and reconstructed mean annual streamflow in the Salt and Verde watersheds of the Lower Colorado River Basin. Results indicate that the detectable cont ... More
Presented by Dr. Katherine HIRSCHBOECK on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Nearly all reconstructions of the large-scale temperature history of the Common Era rely on tree-ring proxies. Estimates of past climate variability and the sensitivity of the ocean-atmosphere system to changes in solar and volcanic forcing are likewise informed by these reconstructions. In concert with ice cores proxies tree-rings provide one of the primary means for identifying the timing of ( ... More
Presented by Dr. Kevin ANCHUKAITIS on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
The precise study of the variability of winter temperature in recent centuries is critical, due to the fact that the increase in the prevalence of warm winters is regarded as clear evidence of climate warming in Poland. The study was conducted in the Silesia Region, located at the south of Poland, eastern Europe. The investigated region is particularly favorable for historical climate studies than ... More
Presented by Dr. Magdalena OPAłA on 15 May 2013 at 18:00
Type: Oral Presentation Session: Dendrogeomorphology
Track: Dendrogeomorphology
The evolution of gully retreat has often been addressed through short-term field monitoring of headcuts or the interpretation of aerial photographs, but rarely studied with dendrogeomorphology. Pinus pinaster roots spanning incised gullies are found in sandy badlands in Spain, where retreat rates of 0.53 m yr–1 have been observed through repeat surveying. The advantage of this case-study site li ... More
Presented by Prof. Markus STOFFEL on 17 May 2013 at 13:50
Type: Poster Presentation Session: Poster Session + Reception
Tree rings are a reliable source of information for studying past climate variability. In this sense, frost events can be recorded in the annual rings of tree as frost rings. We analysed samples from five Araucaria araucana forests in northern Patagonia, Argentina and classified the position of frost damage within tree rings. A regional frost ring chronology of 700 years was developed. The most ge ... More
Presented by Mr. Martín HADAD on 15 May 2013 at 18:00
Type: Oral Presentation Session: Climate of Recent Millennia I
Track: Climate of recent millennia
We developed earlywood and latewood chronologies of frost-damaged rings (frost rings) from three lower forest border Douglas fir (Pseudotsuga menzeisii Mirb. Franco) sites in central Idaho, USA spanning AD 1281-2009. In these records, frost rings occur more frequently in earlywood than in latewood, tree age does not significantly affect whether or not a tree records a frost event, and some weak tr ... More
Presented by Christopher J. CRAWFORD on 14 May 2013 at 15:30
Type: Oral Presentation Session: Climate Growth Relations II
Track: Climate-growth relationships
Juniperus excelsa and Picea smithiana from three sites of Hunza valley were sampled to develop chronologies. Juniperus excelsa from Morkhun showed extremely narrow rings. Ring-width measurements were detrended using the standardization method to preserve as much climatic signals as possible. EPS, SNR, and Rbar values were higher in Juniperus excelsa. To determine whether climate was the main facto ... More
Presented by Dr. Moinuddin AHMED on 14 May 2013 at 11:55
Type: Poster Presentation Session: Poster Session + Reception
Various studies have described the application of tree rings to seismological research. While most of these studies have focused on the growth response of species adjacent to the fault, very few have examined the spatial variation of the response at a moderate distance from the disturbance. In this study, Douglas-fir (Pseudotsuga menziesii) cores were examined from four sites at a distance of up t ... More
Presented by Ms. Kayla PENDERGRASS on 15 May 2013 at 18:00
Type: Oral Presentation Session: Tropical Dendrochronology
Track: Tropical dendrochronology
In subtropical northwestern Argentina (22-20°S; 64-66°W), changes in forest composition reflect the large diversity of environmental conditions resulting from interactions between topography and regional climate. The dominant patterns of interannual variations in 15 tree-ring chronologies (including four subtropical species: Juglans australis, Cedrela lilloi, Alnus acuminata and Schinopsis lore ... More
Presented by Dr. María Eugenia FERRERO on 17 May 2013 at 09:30
Type: Poster Presentation Session: Poster Session + Reception
This study describes the most prominent anatomical features associated with the presence of annual growth bands in eight species from the tropical Bolivian Cerrado forest: Amburana cearensis, Cedrela fissilis, Platimiscium ulei, Centrolobium microchaete, Hymenaea courbaril, Anadenanthera colubrina and Ficus boliviana. In six from the eight species, marginal parenchyma is the most common pattern de ... More
Presented by Dr. Lopez Callejas LIDIO, Dr. Villalba RICARDO on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
We present two chronologies of dead and weakened Quercus ilex trees from declining open woodlands of Southern Andalusia and discuss climate's implication in the current widespread mortality in these ecosystems. Basal area increments were used to find out periods of growth decline preceding death. Absent rings became frequent since the 1970s, coinciding with increasing drought. Negative pointer yea ... More
Presented by Dr. Reyes ALEJANO on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Research has shown growth-climate associations for Quercus alba and Q. rubra are similar and consistent across their geographic range. Correlations between growth and early growing season water balance variables were spatially replicated, evidence for cause-effect relationships. This analysis was expanded to Q. prinus, Q. velutina, Q. macrocarpa, and Q. stellata and includes 116 sites. Correlat ... More
Presented by Dr. David LEBLANC on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
The highly waterdependent semiarid Andes of Chile and Argentina (CChA) are characterized by extremely variable annual precipitation regimes. The existing hydroclimate instrumental records from CChA provide a spatially dense network but only for the last 40-80 years. During recent decades our tree-ring studies in Austrocedrus chilensis have demonstrated the usefulness of this conifer to reconstruct ... More
Presented by Dr. Carlos LEQUESNE on 15 May 2013 at 18:00
Type: Oral Presentation Session: Tropical Dendrochronology
Track: Tropical dendrochronology
Central America sits at the center of a virtual crosshairs of predicted declines in precipitation due to anthropogenic climate change. Understanding patterns of past, present, and future rainfall variability in the region is not simply a question of climatology, but of the potential human consequences of climate change. Here, we demonstrate crossdating and identify a climate signal in high-elevat ... More
Presented by Dr. Kevin ANCHUKAITIS on 17 May 2013 at 09:10
Type: Poster Presentation Session: Poster Session + Reception
In montane forests of Jasper National Park, Canada, 20th century land use altered fire frequency and resulted in changes to forest structure and composition that render low and high elevation forests more similar. We tested whether historical fires in Jasper included high and moderate severity fires comprising a mixed-severity fire regime. Cross-dated, annually-resolved fire-scar records were comb ... More
Presented by Raphael D CHAVARDES on 15 May 2013 at 18:00
Type: Oral Presentation Session: Fire Ecology I
Track: Fire ecology
The high-elevation forests of Grand Canyon´s North Rim have supported the most severe fires in the Park´s recorded history. Since 2000, 11,650 acres have burned with high severity, occasionally in patches exceeding 1,000 acres. Information about the historical arrangement in time and space of severely burned forests is valuable for comparison to the modern fire regime, allowing managers to confi ... More
Presented by Larissa YOCOM on 14 May 2013 at 09:50
Type: Poster Presentation Session: Poster Session + Reception
The scientific study of tree rings – the modern field of dendrochronology – dates to the early 20th century with the pioneering research of Douglass at Arizona. Since that time, it has become a respected field, with training and research laboratories, specialized journals, diverse applications to other areas of science, scientific societies, and a worldwide network of researchers. Even though ... More
Presented by Prof. James CAPSHEW on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Wildfire history and climate change were investigated over the middle part of the Chinese Loess Plateau. High-resolution analysis of charcoal and sediment in combination with OSL dating were carried out in a complete eolian loess-soil profile. The results indicate that wildfires occurred frequently during the last glacial through to the early Holocene under the dry climate. Wildfires were reduced ... More
Presented by Prof. Chunchang HUANG on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Unlike other geomorphic processes, each injury recorded in trees growing on a rockfall slope will typically be considered one rockfall event. Reconstructed rockfall activity and fluctuations thereof will thus heavily depend on sample depth and the spatial distribution of sampled trees. In addition, fewer events will normally be recorded the farther one goes back in time due to decreasing sample de ... More
Presented by Mr. Daniel TRAPPMANN on 15 May 2013 at 18:00
Type: Oral Presentation Session: Wood Anatomy
Track: Wood anatomy
Partial cutting is known to enhance the growth of residual stems. However, a significant radial increase can lead to a lesser wood quality in regard of anatomy and density parameters. Our research aims to evaluate black spruce growth and wood quality within various partial cutting treatments in Quebec. We evaluated the annual yield and the wood quality by examining tree-ring density and anatomical ... More
Presented by Ms. Émilie PAMERLEAU-COUTURE on 15 May 2013 at 10:20
Type: Poster Presentation Session: Poster Session + Reception
Flood risk management decisions require the rational assessment of mitigation strategies. Here, we present a study case where tree-rings have been used for including past flood dating into a cost-benefit methodology to compare structural alternatives for flood-risk mitigation in Navaluenga (Ávila, Spain). Uncertainties have been assessed by comparing the flood frequency obtained with a hydrologic ... More
Presented by Dr. Juan Antonio BALLESTEROS CANOVAS on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Modeling carbon uptake by terrestrial ecosystems (Gross Primary Production (GPP)) is important because plants transfer approximately 120Gt of Carbon, annually, from the atmosphere to the biosphere. This sequesters a portion of the anthropogenic carbon being released to the atmosphere. However, GPP models are inaccurate due to the difficulty of measuring all carbon within the system. Here, we in ... More
Presented by M Ross ALEXANDER on 15 May 2013 at 18:00
Type: Oral Presentation Session: Fire Ecology II
Track: Fire ecology
In Mongolia, mean annual temperature has increased by 2OC and forest and steppe fires have increased in temporal and spatial scales in recent decades. We developed a network of fire-scar chronologies across forests in northern Mongolia to place this recent fire history and associated fire climatology into their longer term historical context, and to assess relationships between historical fires an ... More
Presented by Byambagerel SURAN on 16 May 2013 at 11:00
Type: Poster Presentation Session: Poster Session + Reception
The summer school objectives were to sharpen and broaden the dendrochronology skills of the participants, stimulate ideas for future dendrochronological research, and foster collaboration of tree-ring researchers around the world. The course was hosted by the National Center for Environmental Education at the Valsaín Forest (Spain). The course had 14 participants from three countries (Spain, Alg ... More
Presented by Dr. Juan Antonio BALLESTEROS CANOVAS, Prof. Ramzi TOUCHAN, Mr. Dave MEKO on 15 May 2013 at 18:00
Type: Oral Presentation Session: Invited Speaker + Plenary Session (Dendroecology)
Track: Dendroecology
The invasion of European earthworms into North American temperate forests is profoundly and fundamentally changing the dynamics of these ecosystems. Immediately upon invasion, forest soils are compacted, native plant communities are reduced in diversity and abundance, the fine root systems of trees and their associated mycorrhizal communities are disrupted, carbon fluxes increase, nitrogen is mine ... More
Presented by Dr. Evan LARSON on 16 May 2013 at 08:40
Type: Poster Presentation Session: Poster Session + Reception
During the last Ice Age earthworms were eradicated from the Great Lakes Region. Earthworms present today are invasive, were introduced by European settlers, and have since spread via migration widespread dispersal by people. Earthworms alter the structure, composition, and nutrient cycling of forest communities. We examined how earthworm invasion effects tree growth and productivity. We sampled ea ... More
Presented by Ms. McKaylee DUQUAIN on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Fourteen moisture sensitive tree-ring sites, (37 chronologies; annual, earlywood, and latewood) were developed to create robust multi-proxy reconstructions of annual water year and summer streamflow for four gauges within the Souris River Basin. Multiple linear regressions were able to account for ~76% and ~67% of the instrumental variance for water-year and summer flows, respectively. Spectral a ... More
Presented by Jessica VANSTONE on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Six water emergencies have occurred since 1981 for the New York City region (NYC) despite: 1) 30 yrs of water conservation policies and 2) meteorological data showing little severe or extreme drought since 1970. We reconstruct 472 years of moisture availability to place these emergencies in long-term context. Thirty-two chronologies comprised of 12 species account for up to 66.2% of the average Ma ... More
Presented by Neil PEDERSON on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Track: Recent growth changes and tree mortality
The current climate change involves an increase in droughts events. We analyze the impact of drought on the radial growth and vigor of two pine species (Pinus sylvestris, Pinus nigra) in a semi-arid mountain at southeastern Spain near of their rear edge limit. We used dendrochronological methods, defoliation records, linear mixed and logistic models for growth and defoliation, respectively, to qua ... More
Presented by Dr. Raul SáNCHEZ-SALGUERO on 15 May 2013 at 18:00
Type: Oral Presentation Session: Climate of Recent Millennia I
Track: Climate of recent millennia
High elevation tree-ring widths from Great Basin bristlecone pine (Pinus longaeva) are a particularly useful proxy to infer temperatures prior to the instrumental record in that the tree-rings are annually dated and extend for millennia. We have created a very long (4500+ years) annually resolved record of ring width, and an estimate of past treeline elevation for the Great Basin, USA. These recor ... More
Presented by Matthew SALZER on 14 May 2013 at 15:10
Type: Oral Presentation Session: Dendrogeomorphology
Track: Dendrogeomorphology
This study focuses on the reconstruction of spatio-temporal patterns of past snow avalanche events in forested paths of the Queyras massif (southeast French Alps). Analysis based on tree-ring series from 163 heavily affected multi-centennial Larix decidua Mill. trees growing near or next to the avalanche path. A total of 514 growth disturbances were identified pointing to 38 destructive snow avala ... More
Presented by Dr. Christophe CORONA on 17 May 2013 at 14:30
Type: Oral Presentation Session: Invited Speaker + Plenary Session (Decison Making)
Track: Science and decision making
The need for science to inform decision making, particularly in the light of the need to adapt to a changing environment, has provided opportunities for scientists to engage with resource managers. Tree-ring scientists are well-positioned to respond to these needs. Planning requires some knowledge of what may occur in the future, and somewhat ironically, looking into the past is a key source of t ... More
Presented by Connie WOODHOUSE on 15 May 2013 at 08:40
Type: Poster Presentation Session: Poster Session + Reception
We collected fire scars from Ponderosa pine (Pinus ponderosa) to characterize the fire frequency and severity of a stand in the Valles Caldera National Preserve in New Mexico. We developed a master-tree chronology using Douglas- fir (Pseudotsuga menziesii) cores to cross-date fire scars to detect precise fire years. After identifying fire event years, we qualitatively assessed seasonality of fire ... More
Presented by Mrs. Christina RESTAINO on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Fire scars are visible evidence of compartmentalization and closure processes that contribute to tree survival after fire injury. Preliminary observations of dissected fire scars from trees injured within the last decade showed centripetal development of wound-initiated discoloration (WID) through 2-3 decades of former sapwood in Larix occidentalis and Pseudotsuga menziesii. Although the WID reach ... More
Presented by Dr. Kevin T. SMITH on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
A phenomenal late Pliestocene (interglacial or interstadial) faunal assemblage has been collected from the Snowmastedon site (2270 m) in central Colorado. The assemblage contains several thousand bones from dozens of species, including many individual mammoths and mastodons. An equally impressive number of wood fossils have been collected. Many of the fossils, especially the largest logs (~40-6 ... More
Presented by Dr. Peter BROWN on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Trees affected by mass movements record the evidence of geomorphic disturbance in their growth-ring series, thereby providing a precise geochronological tool for the reconstruction of past process activity. Identification of activity was typically based on the presence of growth anomalies in affected trees and focused on the presence of scars, tilted or buried trunks as well as on apex decapitatio ... More
Presented by Prof. Markus STOFFEL on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Abstract There is a small but substantial literature showing mean sensitivity to be a poor statistic for describing the properties of tree-ring data. Yet, it continues to be widely used. We show in a logical and straightforward way that mean sensitivity is an inefficient estimator of the coefficient of variation and that mean sensitivity can be expressed as a function of the variance and first-ord ... More
Presented by Dr. Andrew BUNN on 15 May 2013 at 18:00
Type: Oral Presentation Session: Climate of Recent Millennia II
Track: Climate of recent millennia
The dendroclimatology of Pinus longaeva tree rings has six decades of history. The attractions are clear: the longevity of the trees (~5000 years), the persistence of relict wood (~10,000 years), and their strong cross-dating. The work is complex however, as the high, cold, dry growth conditions can make it hard to disentangle temperature and moisture signals. Further, confusion has been unwitting ... More
Presented by Prof. Malcolm HUGHES on 15 May 2013 at 17:10
Type: Oral Presentation Session: Invited Speaker + Plenary Session (Dendroecology)
Track: Dendroecology
We examined the surface fire regime in a ponderosa pine-dominated forest on the Hualapai tribal lands in Arizona. Using 113 fire-scarred trees from five 25-ha sites, we inferred spatio-temporal attributes and regulators of the fire regime over three land-use periods (historical, suppression, modern) between 1702 and 2007. Fire frequency and synchroneity patterns were similar, but fire seasonality ... More
Presented by Amanda STAN on 16 May 2013 at 09:00
Type: Oral Presentation Session: Isotopes in Dendrochronology II
Track: Isotopes in dendrochronology
Approximately half of the annual precipitation in Southern Arizona comes from the summer monsoon season in July-September. Natural and human systems in the U.S. Southwest profoundly benefit from delivery of this summer moisture, and knowledge of the variability in precipitation through time provides a baseline for water planning and assessing climate changes. Established linkage between stable-c ... More
Presented by Prof. Steven LEAVITT on 17 May 2013 at 11:10
Type: Oral Presentation Session: Climate of Recent Millennia II
Track: Climate of recent millennia
Long-term records of atmospheric pressure and circulation patterns are needed to understand the drivers of past droughts and to evaluate how future climate changes may impact hydroclimatic systems. We utilized 500hPa geopotential height (GPH) data from the Twentieth Century Reanalysis (V2) project and existing tree-ring chronologies from the International Tree-Ring Data Bank to reconstruct a multi ... More
Presented by Erika WISE on 14 May 2013 at 16:50
Type: Oral Presentation Session: Fire Ecology II
Track: Fire ecology
Forest fires are one of the main disturbance agents in boreal and temperate ecosystems. To decipher large-scale temporal and spatial patterns of past fire activity in Scandinavia, we analyzed the synchronicity of dendrochoronologically reconstructed fire events in a large network of sites covering a wide geographical gradient (56.5 - 67.0 º N and 9.3 - 20.5 º E) over AD 1400-1900. We identified ... More
Presented by Dr. Igor DROBYSHEV on 16 May 2013 at 10:00
Type: Oral Presentation Session: Dendrohydrology
Track: Dendrohydrology
A multi-species network of tree ring-width and ring-density measurements from new and archived tree-ring chronologies collected in west central British Columbia. Using this network, models were constructed allowing for reconstructions of Pacific salmon abundance and July-August mean runoff for the Skeena and Atnarko rivers. Our models describe intervals of below-average runoff during the early to ... More
Presented by Dr. Dan SMITH on 17 May 2013 at 10:50
Type: Oral Presentation Session: Dendroecology II
Track: Dendroecology
Landscapes are dynamic and complex, shaped by natural and anthropogenic processes operating on a variety of spatial and temporal scales. This study employs a multi-scale, multisource, cross-referential analysis to better understand the complex ecological landscape history at Zena Forest, Willamette Valley, Oregon between 1850 and 1935, prior to the availability of aerial imagery. We used the hist ... More
Presented by Ms. Kelsey COPES-GERBITZ on 14 May 2013 at 14:30
Type: Poster Presentation Session: Poster Session + Reception
One of the latest applications of proxies related to tree-ring is the use of the image analysis of blue reflectance (BR). This study presents the analysis of BR for sixe coniferous spices which grow in Tatra Mountains, Carpathians within subalpine (Larix decidua Mill., Picea abies (L.) Karst., Pinus Cembra (L.), Pinus mugo Turra) and montane (Abies alba (L.) Karst., Pinus sylvestris (L.)) zones, c ... More
Presented by Dr. Ryszard Jerzy KACZKA, Mrs. Barbara CZAJKA on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Wildfire is an important disturbance agent in western Canadian forests, and land management and fire exclusion strategies have made the modern record of fires unrepresentative of the natural disturbance regime resulting in apparent landscape homogenization. This research uses a multiproxy fire history approach to reconstruct wildfire history in the Alberta Foothills, a landscape believed to be cha ... More
Presented by Ms. Vanessa STRETCH on 15 May 2013 at 18:00
Type: Oral Presentation Session: Climate Growth Relations II
Track: Climate-growth relationships
We developed new longleaf pine (Pinus palustris R. Mills) chronologies from living trees and remnant stumps from two sites in central Florida to determine the relationship between tree-growth and climate near its southern range margin and to determine the potential to inform water resource managers through hydrologic reconstructions. The chronologies extended from 1551–2006 and 1536–2006 with ... More
Presented by Nicholas FLINNER on 14 May 2013 at 11:35
Type: Oral Presentation Session: Climate of Recent Millennia II
Track: Climate of recent millennia
The North American monsoon is a major focus of modern and paleoclimate research, but relatively little is known about interannual- to decadal-scale monsoon moisture variability in the pre-instrumental era. This study draws from a new network of sub-annual tree-ring latewood width chronologies and presents a 470-year reconstruction of monsoon (June-August) standardized precipitation for southwester ... More
Presented by Mr. Daniel GRIFFIN on 14 May 2013 at 16:30
Type: Poster Presentation Session: Poster Session + Reception
Crown dieback is frequently observed in most Nothofagus pumilio forests located in relatively dry environments of the north Patagonian Andes. Seven stands of N. pumilio showing external evidence of crown decline were sampled to determine the relationships between radial growth patterns and crown dieback. In each stand, Principal Component Analyses were applied to ring width and basal area increme ... More
Presented by Ms. Milagros RODRIGUEZ CATóN on 15 May 2013 at 18:00
Type: Oral Presentation Session: Climate Growth Relations I
Track: Climate-growth relationships
Limited understanding of forests’ climate sensitivity contributes to widely divergent estimates of their past and future carbon sink capacity in current vegetation models. Hence, extensive empirical archives are needed to link forest growth to climate variability at large spatiotemporal scales. Here, we compile and classify close to 1000 tree-ring records for all major European tree species and ... More
Presented by Mr. Flurin BABST on 14 May 2013 at 10:10
Type: Oral Presentation Session: Climate of Recent Millennia I
Track: Climate of recent millennia
Turquoise, parrots, and other goods appear to have been exchanged between the ancient Southwest and central Mexico during the Classic and Post-Classic Eras. Exchange along the ‘Turquoise Road’ brought at least some Mesoamerican ideas into the Southwest, notably at Casas Grandes, Chihuahua (Paquime), and Chaco Canyon, New Mexico. Major questions remain about the importance, timing, and climat ... More
Presented by Dr. David STAHLE on 14 May 2013 at 14:30
Type: Poster Presentation Session: Poster Session + Reception
Tree rings result from the total number of woody cells formed under various positive and negative environmental influences prevailing prior to and during a growing season. That is why it is assumed that cell-anatomical variables such as lumen area or wall thickness may have ‘archived’ some environmental information. Most studies up to now were made with deciduous tree species such as oak and b ... More
Presented by Prof. Martin WILMKING on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Our study was designed to identify the relationships between climate parameters, such as precipitation, and δ18O values of tree ring α-cellulose extracted from exactly dated tree rings of Pterocarpus angolensis growing in the arid to semiarid Mzola region of western Zimbabwe. We applied the Modified Brendel technique to isolate α-cellulose from raw wood samples extracted from two P. angolensis ... More
Presented by Ms. Kerry MCLERAN on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
We investigated relationships between climatic variability and historical wildfires in Florida Keys pine rocklands using tree-ring samples from the canopy dominant Pinus elliottii var densa (South Florida slash pine). We compared a new set of crossdated fire-scar chronologies spanning the period 1707–2010 CE to measured values of ENSO (NIÑO3.4), PDO, and regional temperature and precipitation. ... More
Presented by Dr. Grant HARLEY on 15 May 2013 at 18:00
Type: Oral Presentation Session: Dendroclimatology II
Track: Dendroclimatology
The discovery of non-permineralized (mummified) wood fossils within Canadian Arctic kimberlites (62°N paleolatitude) has invited a paleoclimatic study of the Paleocene-Eocene transition, a time of extreme global warmth (12 – 15°C above modern temperatures). Kimberlite eruptions (dated at 55.5 and 53.3 ±0.7 Ma) buried wood in pyroclastic debris, thus entombing them within an anaerobic enviro ... More
Presented by Mr. Benjamin HOOK on 16 May 2013 at 11:20
Type: Oral Presentation Session: Old World Dendroarchaeology
Track: Old World dendroarchaeology
We use tree-ring records of temperature and water to illuminate the role of energy and water in the evolution of the Mongol Empire. Because water and energy are tightly linked in human and natural systems, studying their synergies and interactions make it possible to integrate knowledge across disciplines and human history, yielding important lessons for modern societies. We focus on the role of e ... More
Presented by Ms. Amy HESSL on 16 May 2013 at 15:00
Type: Poster Presentation Session: Poster Session + Reception
Despite the progress made during the past 20 years searching dendrochronological potential in tropical and subtropical tree-species, tropical dendrochronology is still in a development stage. The aim of this research was to determine the potential of Cedrella. odorata for dendrochronological studies in the Selva Central of Peru. The tree-ring anatomical characteristics were carefully examined and ... More
Presented by Ms. Manuel Jesús PEREYRA ESPINOZA, Dr. Mariano SANTOS MORALES on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Water resources of the southwestern Canadian Prairies are limited and sensitive to changes in climate and land cover. An increasing demand for water resources has increased vulnerability to hydrological drought. Because few instrumental records exceed 100 years, climate proxies are used to extend the historical record of natural variability. Fifteen moisture sensitive tree-ring chronologies (Pi ... More
Presented by Ms. Samantha KERR on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Tree-ring samples were collected from trees growing on the flanks of various volcanoes of the central Andes Volcanic Range, on the border of Argentina and Chile. The species sampled were Araucaria, which appear to be up to 800 years in age, and Austrocedrus, which are about 150 years in age. The Araucaria samples have extremely narrow rings for hundreds of years in a row, and strictly speaking c ... More
Presented by Dr. Paul R. SHEPPARD on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
A network of more than a thousand tree-ring chronologies across the Northern Hemisphere provides precisely dated annual resolution data on past droughts and pluvials spanning the last two thousand years (the Common Era). Hydroclimate reconstructions using these proxies consistently reveal epochs of anomalously dry and wet conditions of substantially greater magnitude and duration than those record ... More
Presented by Dr. Kevin ANCHUKAITIS on 15 May 2013 at 18:00
Type: Oral Presentation Session: Invited Speaker + Plenary Session (Decison Making)
Track: Science and decision making
Pinus species from around the world exhibit various adaptations to fire as an evolutionary force. Adaptations such as cone serotiny or thick bark are widespread in Pinus, such that Mirov in his classic volume The Genus Pinus (1967) devoted more attention to fire than on any other physiological or ecological factor affecting various species of the genus. In this talk, I focus on how dendroecologi ... More
Presented by Dr. Peter BROWN on 15 May 2013 at 08:20
Type: Oral Presentation Session: Recent Growth Trends and Tree Mortality
Track: Recent growth changes and tree mortality
Austrocedrus chilensis forests in northern Patagonia experience stand-level growth decline and mortality. While this disturbance has been subject of detailed study, the role of contributing factors such as climate variation and processes associated with stand development has just begun to be understood. We studied the influence of climatic variation and stand development on the radial growth decli ... More
Presented by Dr. Mariano AMOROSO on 16 May 2013 at 15:00
Type: Poster Presentation Session: Poster Session + Reception
Quantitative data on historical forest structure (tree composition, densities, basal areas, size distributions, and spatial arrangements) are rare for Colorado Front Range forests dominated by ponderosa pine. The Front Range Forest Reconstruction Network was initiated in spring, 2012, to develop these metrics to better inform ecological restoration efforts, and to examine changes in forests and f ... More
Presented by Dr. Peter BROWN on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
The current mountain pine beetle (mpb) epidemic has killed lodgepole pines throughout their range in Colorado, including above 3077 m. Prevailing opinion suggests that mpb activity at such high elevation is unprecedented. We selected old stands above 3077 m and examined remnant wood for signs of mpb attack: visible galleries, exit holes, frass, larval galleries and pupal chambers; stems broken 13 ... More
Presented by Ms. Laurie HUCKABY on 15 May 2013 at 18:00
Type: Oral Presentation Session: Isotopes in Dendrochronolgy
Track: Isotopes in dendrochronology
Improving the understanding of past climate in the Mediterranean basin is still a challenge due to the very distinct seasonality and high climatic variability inherent to this region. Studying the climate of the Iberian Peninsula is particularly complicated because of the complex orography and the atmospheric circulation patterns composed by the influence of three climatic regimes: Atlantic, conti ... More
Presented by Dr. Laia ANDREU-HAYLES on 17 May 2013 at 09:50
Type: Oral Presentation Session: Tropical Dendrochronology
Track: Tropical dendrochronology
Dendrochronological studies are an important tool to provide important paleoclimatic data. In the tropics, however, dendroecology is still a rather young science and little is known about how climate affects the development of these sensitive ecosystems. We present the first tree-ring chronology of a dry forest and a humid forest in southern Ecuador and compare it with the ENSO index. Therefore ... More
Presented by Ms. Darwin Alexander PUCHA COFREP on 17 May 2013 at 08:50
Type: Poster Presentation Session: Poster Session + Reception
The present study used three species (Picea smithiana, Juniperus excelsa and Pinus gerardiana) ring-width chronologies to investigate palaeo-temperature history in Gilgit valleys Northern Pakistan. Picea smithiana Jutial chronology was used to reconstruct March-June temperatures back to A.D. 1523. The calibration model explained 38.16% of the variance in temperature. The reconstructed temperature ... More
Presented by Mr. Muhammad ZAFAR on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Compared to the western United States, there is a relative paucity in the understanding of historic fire regimes in the wet and cool north eastern United States. We investigated historic fire frequencies at three different sites in the Pine Creek valley of north central Pennsylvania. Fire scarred living trees and remnant materials were dated using dendrochronological methods. Considering all s ... More
Presented by Mr. Joseph MARSCHALL on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
We developed a 750-year tree-ring chronology from Piñon pine trees growing near Grandview Campground (GVP) in the White Mountains to refine the Methuselah Walk bristlecone pine precipitation reconstruction (MWK) which failed to capture five of the ten driest years during its calibration period. GVP was significantly correlated with MWK over 1500–2009 (r = 0.7, p < 0.001) and tracked precipitati ... More
Presented by Thomas WILDING on 15 May 2013 at 18:00
Type: Oral Presentation Session: Invited Speaker + Plenary Session (Dendroecology)
Track: Dendroecology
In humid, broadleaf forests, gap-dynamics are thought to be the prevailing disturbance regime. Paleoecology, however, shows regional-scale changes forest alteration with climatic change. We used 76 tree-ring collections and 5.3k tree recruitment dates to investigate the potential for regional-scale disturbance in a temperate, humid forest. Growth-release analysis indicates coherent and intense can ... More
Presented by Neil PEDERSON on 16 May 2013 at 08:20
Type: Oral Presentation Session: Dendroecology I
Track: Dendroecology
Dendrochronological studies are mainly focused on stem, but rarely includes roots. It is well known that the root system achieves essential tasks such as tree anchorage, water and mineral absorbtion. This study focused on growth response in roots and stem after commercial thinning for black spruce exhibiting root grafting. The study site was located in the boreal forest of Canada. Radial growth wa ... More
Presented by Prof. Cornelia KRAUSE on 14 May 2013 at 10:55
Type: Poster Presentation Session: Poster Session + Reception
Traumatic resin ducts form in xylem and phloem tissue of conifers in response to abiotic wounding, fungal invasion, and insect attack. Little is known about resin duct characteristics in the wood of fire-scarred trees. The aim of this study is to quantify changes in traits of both axial and radial resin ducts, along with those of associated epithelial cells and fusiform rays, in 2 individuals each ... More
Presented by Dr. Estelle ARBELLAY on 15 May 2013 at 18:00
Type: Oral Presentation Session: Isotopes in Dendrochronolgy
Track: Isotopes in dendrochronology
Rising atmospheric CO2, nitrogen (N) deposition and changing precipitation patterns in the northeastern U.S. can influence tree growth and water use efficiency (WUE) through effects on plant water and nutrient relations, productivity, and photosynthetic capacity. To assess these impacts, we collected increment cores from the dominant tree species Quercus velutina from the Chronic Nitrogen Amendmen ... More
Presented by Katie JENNINGS on 17 May 2013 at 08:30
Type: Poster Presentation Session: Poster Session + Reception
Trees are excellent recorders of rockfall activity in terms of their spatio-temporal activity and possible changes thereof. Rockfall depends, among others, on freeze-thaw cycles and the melting of winter ice in clefts. Its temporal frequency and magnitude will likely be altered at higher elevations due to on-going climatic changes. Here we focus on rockfalls triggered from a rock glacier in the Sw ... More
Presented by Prof. Markus STOFFEL on 15 May 2013 at 18:00
Type: Oral Presentation Session: Dendroecology II
Track: Dendroecology
Air pollution emissions were not continually monitored in the Upper Silesian Industrial District (USID), Poland, and data is only available for the last 20 years. Long-lasting and severe tree ring reductions in pines growing 5–20 km north of the USID area recorded particularly high levels of air pollution emissions from 1950 to 1990. Especially high amounts of reductions and many missing rings w ... More
Presented by Dr. Ireneusz MALIK on 14 May 2013 at 15:30
Type: Poster Presentation Session: Poster Session + Reception
We developed a 700-yr, spatially-explicit fire history from 344 crossdated samples and a 1,100-yr estimation of summer precipitation from Pinus sylvestris trees growing across two nature reserves in mid Sweden to examine patterns of fire activity and fire-climate relationships in the context of varying land use. Shifts in the frequency, area, and variance of fire events occurred synchronously in t ... More
Presented by Dr. Evan LARSON on 15 May 2013 at 18:00
Type: Oral Presentation Session: Dendroclimatology I
Track: Dendroclimatology
Tree-rings play an important role in reconstructing past temperature in high-latitude and high-elevation regions. However, little tree-ring research has been done in the subtropical southeastern China. Recent studies show that coniferous tree growth there is limited by temperatures in prior winter and the current growing season. Higher temperature in the dormant season means less damage to leaves ... More
Presented by Dr. Jiangfeng SHI on 15 May 2013 at 11:20
Type: Oral Presentation Session: Old World Dendroarchaeology
Track: Old World dendroarchaeology
In the Early Modern Age (1400-1800) the construction of ocean-going ships was a crucial element of European expansion in what has become known as the Age of Discovery. The shipbuilding industries in the Old World placed unprecedented demands on forests for the supply of timber, while wood resources from the New World served to enlarge European fleets overseas to facilitate domestic transport and c ... More
Presented by Marta DOMINGUEZ-DELMAS on 16 May 2013 at 15:40
Type: Poster Presentation Session: Poster Session + Reception
Blue Intensity (BI) has the potential to provide information on past summer temperatures of a similar quality to maximum latewood density (MXD) at a substantially lower cost. As part of the Scottish Pine Project, BI chronologies have been generated for 17 woodlands from a wider ~50 site Scots pine network around the Scottish Highlands. Focussing on two sites in the Cairngorms National Park, Scotla ... More
Presented by Dr. Rob WILSON on 15 May 2013 at 18:00
Type: Oral Presentation Session: Dendrogeomorphology
Track: Dendrogeomorphology
Trees have long been the dominant life-form used in dendrochronology. In the last few years, however, dendroecology of shrubs comprises a rapidly expanding and vigorous field, especially in arctic, subarctic and alpine regions. But shrubs are not simply small trees, rather a different life strategy to cope with strong environmental variations. For example, issues of crown architecture, resource al ... More
Presented by Prof. Martin WILMKING on 17 May 2013 at 13:30
Type: Poster Presentation Session: Poster Session + Reception
We investigated the sensitivity of sugar maple (Acer saccharum) annual radial growth to climatic variability in Algonquin Provincial Park, south-central Ontario, Canada, using dendroecological techniques. Site chronologies were developed from 19 stands of sugar maple across a range of edaphic conditions and stand properties, but within a small geographical area. Specific sites varied in their re ... More
Presented by Ms. Kerry SCHUTTEN on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Since its discovery in the west courtyard of the Chacoan great house of Pueblo Bonito, the “rooted tree” labeled JPB-99 has captivated the imaginations of archaeologists and the public alike. It stands alone in the archaeological record of the Southwest as the only non-architectural timber unearthed within a ruin. Ideas abound regarding its relevance to the design, location, and ritual practic ... More
Presented by Christopher GUITERMAN on 15 May 2013 at 18:00
Type: Oral Presentation Session: Isotopes in Dendrochronology II
Track: Isotopes in dendrochronology
The North American Monsoon dominates climate in the U. S. Southwest, with discrete cool season and warm season phases. North American Monsoon forcings influence ecosystem synchronization in the U.S. southwest, yet spatial information is almost nonexistent about shifts in the proportions of cool season and warm season precipitation in soil moisture available for plant growth. The influence of the w ... More
Presented by Dr. William WRIGHT on 17 May 2013 at 11:30
Type: Oral Presentation Session: Dendroclimatology I
Track: Dendroclimatology
Spatial modes of tree-growth in a newly developed network of 78 chronologies are summarized by S-mode principal components analysis (PCA), using varimax rotation of components. The network, representing eleven species and five countries, is intended for climatic reconstruction. Runs of PCA on two periods are described: 1) 1923-2000 CE (common period for all 78 chronologies), 2) 1251-2000 CE (tim ... More
Presented by Prof. Ramzi TOUCHAN on 15 May 2013 at 11:00
Type: Oral Presentation Session: Dendroecology I
Track: Dendroecology
The Pinaleño Mountains of southeastern Arizona contain the southernmost spruce-fir forest in North America. Contemporary disturbance events in this forest include bark beetle outbreaks in the 1950s and late 1990s, endemic defoliator and exotic aphid outbreaks in the mid-1990s, and a stand-replacing fire in 2004. Using dendrochronology, we reconstructed the disturbance events and stand dynamics ... More
Presented by Mr. Christopher O'CONNOR on 14 May 2013 at 11:35
Type: Poster Presentation Session: Poster Session + Reception
Mongolia has recently focused on agricultural initiatives to improve food security under the uncertainty of climate change. We used a network of tree-ring chronologies to reconstruct May-September Yeruu River streamflow (1680-2001) to better understand historical climate variability in the ‘eastern’ part of the Mongolian Breadbasket. Model calibration from 1959-1987 captured 60.8% of the instr ... More
Presented by Caroline LELAND on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
To understand how the future climate will affect the boreal forest, we studied growth responses to climate variability in black spruce (Picea mariana) and trembling aspen (Populus tremuloides) two major co-occurring boreal tree species of the eastern Canadian boreal forest. We analysed climate growth interaction during (i) periods of non-anomalous growth and (ii) in years with strong growth anomal ... More
Presented by Dr. Igor DROBYSHEV on 15 May 2013 at 18:00
Type: Oral Presentation Session: Isotopes in Dendrochronology II
Track: Isotopes in dendrochronology
Little is known of past climate in northern New England (USA) from tree-ring proxies aside from drought. A preliminary stable carbon isotope ratio chronology (1849-2010) from eastern hemlock (Tsuga canadensis) trees was developed to explore other climate relationships at a moist mid-latitude site. Significant correlations with maximum growing season temperature (r=0.53, P<0.01) and spring cloud ... More
Presented by Prof. Shelly RAYBACK on 17 May 2013 at 10:50
Type: Poster Presentation Session: Poster Session + Reception
We present the first annual δ13C analyses from Fitzroya cupressoides, one of the oldest tree species in the world. Preliminary results from four series (since 1900) from trees growing in the Coastal (2) and Andean cordillera (2) indicate a significant increasing trend in intrinsic water use efficiency that is especially strong during the last 50 years. Tree growth data from tree-ring chronologies ... More
Presented by Mrs. Rocio URRUTIA JALABERT on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Stable carbon and oxygen isotopic analyses are presented from 14C dated living Acacia tortilis (Forssk.) Hayne trees sampled with the aim of exploring the stable isotope palaeoclimatic potential of this species in xeric regions of northern Africa. Trees were sampled at Gebeit (Red Sea State, Sudan) under the auspices of the ACACIA Project. Stable carbon isotopic ratios were assigned calendar dates ... More
Presented by Dr. Mary GAGEN on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
As part of the 2012 North American Dendroecological Field Week (NADEF), we reconstructed stand dynamics of a depression on a lava flow in the Valles Caldera National Preserve, New Mexico. Our study area presented a unique opportunity to assess stand dynamics as related to aspect. Within each of five plots (N, S, E, W slopes and depression center) we collected tree-ring data from 10 live or dead ... More
Presented by Mr. Joseph PETTIT on 15 May 2013 at 18:00
Type: Oral Presentation Session: Dendrohydrology
Track: Dendrohydrology
Ring widths of 394 Populus deltoides, ssp. monilifera trees from a relatively undisturbed setting in the North Unit of Theodore Roosevelt National Park, North Dakota, are analyzed for potential use in reconstructing the flow of the Little Missouri River. Results indicate that a single well-replicated age-curve-standardized (ACS) (similar to regional-curve standardization) cottonwood chronology ex ... More
Presented by David MEKO on 17 May 2013 at 10:30
Type: Poster Presentation Session: Poster Session + Reception
We developed a streamflow reconstruction of the Biobío River, located on the limit of influence of Mediterranean and wet-temperate climate. We compared it with previous reconstructions from the Temperate (Puelo-River) and Mediterranean (Maule-River) climates. The present trend of reduced flow in both Biobío and Puelo Rivers seems to be part of a low frequency cycle (>80 years) shared by these r ... More
Presented by Dr. Ariel MUñOZ on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Across much of its native range, eastern hemlock (Tsuga canadensis L.) is threatened by the invasive forest pest, hemlock woolly adelgid (HWA) (Adelges tsugae Annand). In West Virginia, the Wildlife Diversity Unit (WDU) has listed hemlock forest systems as a “very high” conservation priority due to the extrinsic threat of HWA infestation and declining quality of these systems. Eight permanen ... More
Presented by Dr. Tom SALADYGA on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Effects of recent warming and fire suppression have created unprecedented changes in fire behavior and severity of wildland fires in some forests of the Western US. Wildland urban interfaces (WUIs) are particularly vulnerable in the context of these changes. One of the best resources we have for informing future fire management and understanding the interactions of climate, humans and wildfires ... More
Presented by Mr. Joshua FARELLA on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
The 8.2 ka event has been recognized as one of the most significant cooling periods during the Holocene in the north Atlantic realm. However, clear evidence for an 8.2 ka event-related reaction of Alpine glaciers was missing for a long time. In the light of dendrochronological analyses for more than 30 tree remains found in front of the Mont Miné Glacier, Swiss Alps, we present evidence for such ... More
Presented by Dr. Kurt NICOLUSSI on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Track: Tree-ring network analysis
The DCCD is a dendrochronological data repository for Humanities-based research (http://dendro.dans.knaw.nl). It uses the International Tree-Ring Data Standard (TRiDaS), software library TRiCYCLE for ingesting/exporting data in many digital formats, and Access (MS) system TRiDaBASE for exporting/ingesting metadata. The repository contains all heritage-related tree-ring research performed in the Ne ... More
Presented by Dr. Peter BREWER on 15 May 2013 at 18:00
Type: Oral Presentation Session: Fire Ecology III
Track: Fire ecology
Fire is starting to be recognized as a major disturbance that helps to maintain the diverse mosaic of vegetation in the Eastern Deciduous Forest, although the ability to reconstruct fire occurrence in hardwood trees still lags far behind our expertise in reconstructing fire from conifers. This study examines the fidelity of fire scaring in multiple tree species in the Central Hardwood Region of t ... More
Presented by Dr. Jim SPEER on 16 May 2013 at 14:00
Type: Oral Presentation Session: New World Dendroarchaeology
Track: New World dendroarchaeology
Archaeological sites in the American Southwest are some of the best dated in the world because of the widespread availability and applicability of dendrochronology, and the fact that the science has been successfully applied in the region since 1929. Even in reasonably well-dated regions, however, systematic bias is present in very large, regional databases of archaeological tree-ring dates. This ... More
Presented by Dr. Stephen NASH on 16 May 2013 at 13:00
Type: Oral Presentation Session: Dendroclimatology I
Track: Dendroclimatology
We reconstructed tupelo honey yield-per-hive from 1800–2010 using tree-ring data from the nectar-source species, Nyssa ogeche. The composite N. ogeche radial growth chronology and honey yield-per-hive were significantly correlated, suggesting optimal growth conditions are coincident with increased nectar production and that tree-ring data can be used to reconstruct crop history. Tupelo honey yi ... More
Presented by Dr. Justin MAXWELL on 15 May 2013 at 10:40
Type: Oral Presentation Session: Climate of Recent Millennia II
Track: Climate of recent millennia
The living pine network across the Scottish Highlands is now numbered at ~50 sites with almost complete representation of all remnant semi-natural pine woodlands. Due to human impact in the 18th/19th centuries most of the sites are only well replicated back for ~200-250 years. Extension of these chronologies is only possible using both historical and/or sub-fossil material. Sub-fossil samples have ... More
Presented by Dr. Rob WILSON on 14 May 2013 at 16:10
Type: Poster Presentation Session: Poster Session + Reception
Cedars (Thuja occidentalis) that grow on the Niagara Escarpment cliff face provide a unique opportunity to examine the paleoclimate of eastern North America: they are the oldest trees east of the Rockies, they bisect Canada’s population centre, and transect the northwestern limit of tropically originating hurricane tracks – which reach southwestern Ontario approximately once per decade. Thes ... More
Presented by Ze'ev GEDALOF on 15 May 2013 at 18:00
Type: Oral Presentation Session: Isotopes in Dendrochronolgy
Track: Isotopes in dendrochronology
We present a new cellulose extraction, where alpha cellulose is extracted directly from 1mm-thick laths. We prepared 1mm-thick cross sections using diamond saws (Leica SP1600) from wood of teak, fir, beech etc. The laths were enclosed in custom designed cases made of Teflon (Teflon punching sheets, thickness 0.5mm, hole size 1.5mm, pitch 3mm, TIC Corporation, Tokyo, Japan). The small holes of the ... More
Presented by Dr. Akira KAGAWA on 17 May 2013 at 09:30
Type: Poster Presentation Session: Poster Session + Reception
Oregon white oak (Quercus garryana) is an integral part of the ecosystem in the Willamette Valley, Oregon. Human activities including fire suppression and land use change have resulted in the dominance of Douglas fir, making native oak habitat in the region rare. Understanding the relative importance of human vs. climate impacts on Quercus garryana growth will inform conservation techniques for la ... More
Presented by Dr. Karen ARABAS on 15 May 2013 at 18:00
Type: Oral Presentation Session: Invited Speaker + Plenary Session (Decison Making)
Track: Science and decision making
Tree-ring reconstructions of hydroclimate variables such as streamflow, precipitation, and drought indices are increasingly used by water managers and others in risk analyses intended to capture their system’s behavior under paleo-variability. While these users are generally informed about the uncertainty around the reconstructed values—which implies multiple plausible realizations of past var ... More
Presented by Jeffrey LUKAS on 15 May 2013 at 09:00
Type: Poster Presentation Session: Poster Session + Reception
We examined the influence of landscape structure on disturbance, succession, and the duration of legacies initiated by fire across a naturally fragmented boreal forest in northern Sweden. We inventoried 2,038 trees, of which 1,249 were cored and dated, and collected 128 soil samples on 16 distinct forested islands. Several stand characteristics were significantly correlated with island size, inclu ... More
Presented by Ms. Sarah SCOTT on 15 May 2013 at 18:00
Type: Oral Presentation Session: Fire Ecology III
Track: Fire ecology
We estimated subalpine forest productivity over the past 300 years in the Wallowa Mountains of northeastern Oregon using basal area increment (BAI) data from 462 trees across 13 stands of varying age, setting, and successional status. We examined this record in the context of climate variability and disturbance. Landscape-scale BAI was significantly correlated with annual temperatures over the ins ... More
Presented by Ms. Sara ALLEN on 16 May 2013 at 13:40
Type: Poster Presentation Session: Poster Session + Reception
For ancient Egypt, a fundamental concept remains unresolved: time. Despite being the focus of nearly 200 years of research, thousands of archaeological excavations, and despite survival of an extensive written record, the chronology of Egypt has been based on a fragmented copy of a 3rd century BC historian’s chronicle of the pharaonic period. To refine this framework, Egyptologists have relied o ... More
Presented by Dr. Pearce Paul CREASMAN on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Traumatic resin ducts (TRDs) in trees are commonly associated with insect of fungal attacks, mechanical injury or fire damage during the growing season. Here we present records of TRDs from Red fir (Abies magnifica var. shastensis) at five sites along the central Pacific Coast of the western United States. The ratio of rings with TRDs to undamaged rings is highest in the south, and more TRDs are o ... More
Presented by Max TORBENSON on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
In 1946, 25 Castor canadensis pairs were introduced in Tierra del Fuego Island. Today more than 100,000 individuals of this species are distributed in several islands in the southern Patagonia archipielagos and even in the South American continent. The advances of the beaver populations were not systematically registered. We collected 200 dendrochronological samples in seven sites in the continen ... More
Presented by Ms. Giorgia GRAELLS on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Assessing the effects of sunspots on the tree growth was the very first application for which dendrochronology was used. The founder of the scientific use of tree rings, A. E. Douglass began the long development of this method by posing the question of relationship between the Sun activity and the tree growth. The first conclusions drawn from the analysis have not been decisive due to an early sta ... More
Presented by Mrs. Aneta RZEPECKA, Mrs. Karolina JANECKA on 15 May 2013 at 18:00
Type: Oral Presentation Session: Tropical Dendrochronology
Track: Tropical dendrochronology
We present results of recently conducted tree ring research on tropical tree species from Mozambique. We have developed new ring-width chronologies of two tropical hardwood species (Millettiia stuhlmannii, Panga panga and Vitex payos, Chocolate berry) from central Mozambique and use these chronologies to investigate the history of climate variability (principally seasonal drought) in the region. I ... More
Presented by Matthew THERRELL on 17 May 2013 at 08:30
Type: Poster Presentation Session: Poster Session + Reception
In most cases, gauged river flow records in southern South America extend for only a few decades, hampering the detection of long-term cycles and trends. In northern Patagonia, Argentina, the Río Neuquén has great importance for local and national socio-economic activities. We reconstructed the October–June mean streamflow for the period 1346–2000 AD based on a network of 43 tree-ring chrono ... More
Presented by Dr. Ignacio MUNDO on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Tree-rings provide high-resolution records of past climate variations. Five regional tree-ring chronologies from Nothofagus pumilio, the dominant subalpine species in Southern Patagonia, were developed in Santa Cruz, Argentina. Sampling sites were located between 47° and 53°S along both elevation (600-1200 m) and precipitation gradients (west-to-east; 4000 to 1000 mm). In this study, we focus on ... More
Presented by Mrs. Aliénor LAVERGNE on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Insect outbreaks from Ormiscodes anphimone are easily recognized in the Patagonian landscape due to changes in color of Nothofagus pumilio forests in response to strong tree defoliation. In this study we use 26 N. pumilio tree-ring chronologies along a S-N transect from El Chaltén (49º25’S) to Laguna del Desierto (49º00’S) in southern Patagonia to reconstruct past Ormiscodes outbreaks over ... More
Presented by Dr. Mariano MORALES on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
We investigate climate interannual variance and decadal variability in tree rings from the periphery of the retreating Laurentide Ice Sheet to understand how the warming atmosphere affected tree growth and how changes in atmospheric circulation altered high-frequency modes of climate variability. The Great Lakes region provides geological circumstances that favored preservation of ancient wood in ... More
Presented by Dr. Irina PANYUSHKINA on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
This work presents the first tree-ring reconstructions of hydroclimate for the Upper Klamath River basin, which stretches from northern California into southern Oregon. The extended record provides a centuries-long perspective on the region’s hydroclimatic variability and context for water-related political issues that have erupted in recent years. Reconstructions of water year precipitation for ... More
Presented by Steven MALEVICH on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Asian monsoon circulation might be better inferred from tree-ring oxygen stable isotope ratios than ring widths alone, which primarily record local pre-monsoon drought conditions. Here, we present new evidences on the effect of climate and circulation dynamics on stable isotope series in tree-rings from Fokienia hodginsii, a long-lived conifer from southeast Asian highlands. Preliminary analysis r ... More
Presented by Dr. Dario MARTIN-BENITO on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
In this investigation, we assessed the utility of tree-ring width and δ13C from Tsuga canadensis and Quercus rubra trees growing at Harvard Forest, MA to reconstruct drought in New England. We conducted a correlation analysis between ring width, δ13C, and Palmer Drought Severity Index at varying spatial scales (forest stand to region) with data from 1991-2010. As expected, tree-ring width showed ... More
Presented by Stockton MAXWELL on 15 May 2013 at 18:00
Type: Oral Presentation Session: Isotopes in Dendrochronolgy
Track: Isotopes in dendrochronology
Here we present results from a study conducted at Harvard Forest (Petersham, Massachusetts) to examine the potential relationship between δ13C in dominant trees and GPP measured by the Harvard Forest flux tower (1992-2010). The δ13C analysed from Tsuga canadensis and Quercus rubra trees growing in the flux tower footprint and corrected for the declining trend of atmospheric δ13C show a decreasi ... More
Presented by Dr. Soumaya BELMECHERI on 17 May 2013 at 08:50
Type: Poster Presentation Session: Poster Session + Reception
TreeFlow (http://treeflow.info) is a web resource for tree-ring reconstructions of streamflow and climate, providing access to data for over 60 reconstructions as well as information about methodology and applications. It was first developed in 2003 for Colorado river basins, and expanded in 2009 to all of the western US. While the primary users of streamflow reconstructions have been water resour ... More
Presented by Jeffrey LUKAS on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
We updated the eastern white pine chronology developed by Dr. Ed Cook at Devil’s Lake State Park, Wisconsin for an introduction to dendrochronology class project. The original chronology spanned 1642–1982, with a series intercorrelation of 0.664 and mean sensitivity of 0.25. We cored white pines growing on exposed talus slopes overlooking Devil’s Lake and although we encountered rot in nearl ... More
Presented by Mr. Ben GULTCH on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
We updated and examined the stability of the climate response exhibited by the Presque Isle River eastern hemlock chronology developed by Dr. Ed Cook in 1983 along the shores of Lake Superior in northern Michigan. The original and new chronologies were significantly correlated (r2 = 0.9), indicating we successfully updated the original chronology. The updated chronology spanned the period AD 1444 ... More
Presented by Mr. Gabriel BROWNELL on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Track: Dendrogeomorphology
Past activity on seven landslides of the Barcelonnette valley (French Alps) was reconstructed from 759 conifers (3036 cores). Based on 1298 growth anomalies, we identify 61 landslide phases since 1890. Logistic regressions using monthly rainfall data and temperature anomalies indicate that landslides used to occur after wet winters with subsequent positive temperature anomalies in spring, and ther ... More
Presented by Dr. Christophe CORONA on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Badlands are one of the most significant features of erosion and cause huge environmental and economic impacts to society, especially in semi-arid areas with strongly marked seasonal climatic contrasts. In this study, we present a methodology based on the analysis of exposed roots from Pinus pinaster Ait. and terrestrial laser scanning (TLS) to estimate medium-term erosion rates in a badland of th ... More
Presented by Dr. Juan Antonio BALLESTEROS CANOVAS on 15 May 2013 at 18:00
Type: Oral Presentation Session: Isotopes in Dendrochronology II
Track: Isotopes in dendrochronology
Here we test whether trees killed by spruce beetles show a water stress response prior to death using tree-ring chronologies and isotopic measurements from live and dead trees. Growth and δ13C in surviving trees was only weakly correlated with spring-summer temperatures until roughly 10 years before the beetle outbreak, both growth and δ13C in the dead trees was correlated with temperatures for ... More
Presented by Dr. Adam CSANK on 17 May 2013 at 10:30
Type: Oral Presentation Session: Recent Growth Trends and Tree Mortality
Track: Recent growth changes and tree mortality
Across western North America, changes in climate during the late 20th and early 21st centuries have manifested in dramatic periods of tree mortality, such as those driven by wildfire, bark beetle outbreaks, and increased background mortality. This broad-scale mortality is understood to have important impacts on carbon cycling, with feedbacks to global climate change. Despite the importance of tree ... More
Presented by Sarah HART on 16 May 2013 at 15:20
Type: Oral Presentation Session: Recent Growth Trends and Tree Mortality
Track: Recent growth changes and tree mortality
Drought and insect infestations can lead to widespread tree mortality in forest ecosystems. However, models of forest dynamics are limited in their ability to simulate mortality during drought because the processes underlying tree death are poorly constrained. Tree allocation to defense is hypothesized to be a key element in tree avoidance of mortality, but there are few empirical tests of its i ... More
Presented by Ms. Alison MACALADY on 16 May 2013 at 16:20
Type: Oral Presentation Session: Dendrogeomorphology
Track: Dendrogeomorphology
Gravitational processes frequently threaten settlements and transportation corridors in mountain environments. On forested slopes, injuries in trees form an archive of past events which has been used extensively for hazard and risk assessment in the past. However, dendrogeomorphic dating of events often represents a time-consuming and expensive approach, and is not therefore widely used in practic ... More
Presented by Mr. Daniel TRAPPMANN on 17 May 2013 at 14:50
Type: Poster Presentation Session: Poster Session + Reception
Topoclimatic factors can influence seasonal controls on tree growth within local conifer populations, producing differing response signals in measurements of ring properties. Accordingly, microsite chronologies are targeted in a new study design to enhance discrete climatic signals. In semi-arid environments, high resolution palaeohistory of water supply is considered a valuable planning tool for ... More
Presented by Mr. Scotty STRACHAN on 15 May 2013 at 18:00
Type: Poster Presentation Session: Poster Session + Reception
Wave regeneration describes a process involving the death of trees along a narrow moving front perpendicular to the direction of the prevailing winds. For southern Patagonia, regenerating waves are known for the southern island of Tierra del Fuego but have not been reported for the continental forests yet. We reconstructed the history of wave mortality and regeneration patches in Nothofagus pumili ... More
Presented by Dr. Mariano AMOROSO on 15 May 2013 at 18:00
Type: Oral Presentation Session: Wood Anatomy
Track: Wood anatomy
Tree-ring anomalies are increasingly used to better understanding of how environmental conditions influence tree-ring formation. Frost rings (FR) constitute a well described anomaly though little is known about their distribution in tree stems. In contrast, white earlywood rings (WER) constitute an un-described anomaly. These rings present a whitish coloured earlywood and they have been observed i ... More
Presented by Prof. Jacques TARDIF on 15 May 2013 at 10:00
Type: Oral Presentation Session: Climate Growth Relations I
Track: Climate-growth relationships
We conducted a dendroclimatic study of broadleaved tree species in the humid deciduous forests of the eastern United States to understand their response to precipitation, temperature, and drought in a large biogeographical context. We analyzed a network of 86 tree-ring width chronologies composed of eight species along a 1700 km latitudinal transect. All species were sensitive to summer drought, a ... More
Presented by Dr. Dario MARTIN-BENITO on 14 May 2013 at 09:50
Type: Oral Presentation Session: Dendroclimatology II
Track: Dendroclimatology
Locally-absent (or “missing”) growth rings can potentially cause errors in tree-ring dates and dendroclimatic reconstructions but the frequency, distribution and controls of these features are not well understood at large spatial scales. Here we present a synthesis of locally-absent rings across the Northern Hemisphere during the last millennium based on 2,359 publicly-available tree ring-widt ... More
Presented by Scott ST. GEORGE on 16 May 2013 at 10:40
Type: Oral Presentation Session: Old World Dendroarchaeology
Track: Old World dendroarchaeology
In 2004, excavations for a new metro line under the city of Istanbul, Turkey, uncovered the remains of an extensive Byzantine harbour. Still under excavation, this site at Yenikapı has grown into the largest archaeological excavation ever conducted in Turkey. The richness and quantity of recovered artefacts (including numerous shipwrecks with intact cargo) is extraordinary, as is the complete geo ... More
Presented by Dr. Charlotte PEARSON on 16 May 2013 at 15:20
Type: Poster Presentation Session: Poster Session + Reception
Xylogenesis is the method of monitoring cell formation allowing the description of cambial activity and every new xylem cell during the growing season. Cell formation and cell characteristics can be compared with many biotic and abiotic factors. We are conducting research on Douglas fir at three locations in the montane forest of southern Alberta (Canada) during the vegetation season 2013. Chose ... More
Presented by Ms. Jana HOZOVá, Mr. Jakub HACURA on 15 May 2013 at 18:00