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13-17 May 2013
Tucson, Arizona
US/Arizona timezone
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Tree-ring evidences of insect outbreaks in Nothofagus pumilio forests in southern Patagonia, Argentina

Presented by Dr. Mariano MORALES on 15 May 2013 from 18:00 to 21:00
Type: Poster Presentation
Board #: 29

Content

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 the period 1743-2010. In addition, we asses the relationships between outbreaks, climate variability and atmospheric circulation index including the Southern Annular Mode (SAM). Using dendroecological methods, 47 Ormiscodes outbreaks were identified over the period 1743-2010. Tree-ring chronologies from forests affected by Ormiscodes showed abrupt growth reductions during the years following the insect attacks. No periodicities were detected in the outbreak reconstruction. Although the relationships between outbreaks and climate variations seem to be complex, insect outbreaks appear to be related to drier climatic conditions and the positive phase of the SAM.

Place

Location: DoubleTree
Room: Salon E

Primary authors

  • Dr. Mariano MORALES Departamento de Dendrocronología e Historia Ambiental. IANIGLA CCT CONICET, Mendoza
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Co-authors

  • Ms. Misael PALACIOS Dep. Dendrocronología e Historia Ambiental. IANIGLA CCT CONICET, Mendoza, Argentina
  • Dr. Ana SRUR Dep. Dendrocronología e Historia Ambiental. IANIGLA CCT CONICET, Mendoza, Argentina
  • Ms. Alienor LAVERGNE Dep. Dendrocronología e Historia Ambiental. IANIGLA CCT CONICET, Mendoza, Argentina
  • Ms. Milagros RODRIGUEZ CATóN Dep. Dendrocronología e Historia Ambiental. IANIGLA CCT CONICET, Mendoza, Argentina
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