Exxon Valdez Oil Spill Restoration Project Annual Report Fatty Acid Profile and Lipid Class Analysis for Estimating Diet Composition and Quality at Different Trophic Levels
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چکیده
The analysis of lipid class and fatty acid (FA) composition in juvenile herrring and sandlance demonstrates a high degree of localized variation in the availability of energy that may be related to the abundance of specific prey. Herring and sandlance juveniles were sampled from several locations around Prince William Sound during a two week period in late July, 1997. Analysis of their lipid class and FA composition revealed sandlance and herring had signficant differences in the relative amount of triglyceride (TAG) in their lipids depending on the location where they were sampled. These data indicates that the ability of these species to acquire energy varied between sampling sites, even when they were 20 km apart. Fish with high levels of TAG tended to have relatively invariant FA compositions suggesting their acquisition of energy resulted from the consumption of a limited number prey types. These data, while still preliminary, indicate that the combined analysis of lipid class and FA composition may be extremely powerful tool for identifying localized groups of foragers and ranking the relative success of those groups. Kev Words: Fatty Acid Composition, Sandlance, Herring, Lipid Class, Nutritional Condition Proiect Data: This report contains fatty acid data collected from juvenile sandlance and herring collected under APEX 163A in July 1997. In addition to sample collection information and quality assurance data, the concentrations of 29 fatty acids and 10 lipid classes have been determined for 45 juvenile herring, and 60 juvenile sandlance. These data are maintained in a Microsoft Access database at the National Marine Fisheries Service Auke Bay Laboratory. The data will be available for public inspection once this project is complete.
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