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13-17 May 2013
Tucson, Arizona
US/Arizona timezone
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Stable isotope palaeoclimatic potential of Acacia tortilis populations in the Eastern Sahara.

Presented by Dr. Mary GAGEN on 15 May 2013 from 18:00 to 21:00
Type: Poster Presentation
Board #: 1


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 based on high-density radiocarbon results and are presented at near-annual resolution. Water use changes were calculated over the industrial period. These data suggest that the acacia are doing little to conserve water or improve their water use efficiency. This is an unexpected finding for trees growing in such an arid environment but may be consistent with very deep-rooting trees. The variability in the mean isotope series suggests that there are common environmental factors effecting both carbon and oxygen isotope ratios which may hold significant palaeoclimatic potential.


Location: DoubleTree
Room: Salon E

Primary authors



  • Dr. Giles YOUNG Department of Geography, Swansea University, Swansea, SA2 8PP, UK
  • Dr. Gidske ANDERSEN Uni Research AS, P.O. Box 7810, 5020 Bergen, Norway
  • Dr. Knut KRZYWINSKI Uni Research AS, P.O. Box 7810, 5020 Bergen, Norway and Department of Biology, University of Bergen, P.O. Box 7800, 5020 Bergen, Norway
  • Prof. Tomasz GOSLAR Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznan, Poland and Poznań Radiocarbon Laboratory, Rubież 46, 61-612 Poznan, Poland.