SS4.07 Lipids/Fatty Acids in Ecological Research
Date: Tuesday, June 11, 2002
Time: 11:45:00 AM
Location: Saanich
 
VeefkindRJ, School of Earth and Ocean Sciences, University of Victoria, Victoria, Canada, veefkind@uvic.ca
Whiticar, M, J, School of Earth and Ocean Sciences, University of Victoria, Victoria, Canada, whiticar@uvic.ca
Perry, R, I, Pacific Biological Station, Dept. of Fisheries and Oceans, Nanaimo, Canada, perryi@dfo-mpo.gc.ca
Whyte, J, N, Pacific Biological Station, Dept. of Fisheries and Oceans, Nanaimo, Canada, whytei@dfo-mpo.gc.ca
 
MOLECULAR AND ISOTROPIC COMPOSITION OF FATTY ACIDS IN SHORT MARINE FOOD WEBS OFF VANCOUVER ISLAND
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The main objective of the presented study is to investigate whether fatty acid data and/or compound specific stable carbon isotope data can characterize regional food webs. When spatial gradients are large and steep enough, this characterization can be used to distinguish local animals from individuals that moved into the region (either actively or passively). In May 98, May 99 and July 99 samples of POM, zooplankton and larval fish were collected on multiple shelf to off-shelf transects off the West Coast of Vancouver Island. Our results indicate that shelf and off-shelf food webs in May 1998, and to a lesser extent in 1999, could be distinguished on the basis of the relative concentrations of fatty acids and their stable carbon isotope ratios. Additionally, non-site-specific trends with increasing trophic level were found in the fatty acid composition of marine organisms, and were explored with multivariate techniques.