Chandra, S. University of California, Davis, schandra@ucdavis.edu
Brett, M. University of Washington, mtbrett@u.washington.edu
Navarra, D. C. University of California, Davis, doerthe.navarra@dkrz.edu
Liston, A. M. University of California, Davis, amliston@ucdavis.edu
Ayers, S. University of California, Davis, sayers@ucdavis.edu

 
A SEASONAL COMPARISON OF POLYUNSATURATED FATTY ACID (PUFA) CONCENTRATIONS IN TWO DIFFERENT AQUATIC SYSTEMS
 
This study investigated the concentrations of dietary polyunsaturated fatty acids (PUFA) in organisms from different trophic levels. We compared PUFA levels of organisms from two California lakes that were dominated by different algal taxa. Eutrophic Clear Lake was dominated by cyanobacteria. Mesotrophic Davis Creek Reservoir was dominated by diatoms. Monthly PUFA measurements were taken from lake seston, daphnids and copepods in order to assess seasonal variation in PUFA levels. Fish muscle and liver PUFA concentrations were measured quarterly. Total and soluble reactive phosphorus levels, carbon, nitrogen and chlorophyl a content were measured for the seston. Temperature and dissolved oxygen were also monitored. Carbon and nitrogen stable isotopes were used to evaluate food sources and trophic levels, respectively. The accumulation patterns of dietary PUFA from lower to higher trophic levels in these systems suggest the need for further research into the contribution of PUFA to aquatic food web dynamics.
 
Day: Tuesday, Feb. 2
Time: Poster
Location: Sweeney Center
 
Code: CS67TU0285S