SS4.07 Lipids/Fatty Acids in Ecological Research
Date: Tuesday, June 11, 2002
Time: 11:15:00 AM
Location: Saanich
 
Williams, J., Univ. of Southern Mississippi Gulf Coast, Long Beach, , judith.williams@usm.edu
Biesiot, P, , Univ. of Southern Mississippi, Hattiesburg, , Patricia.Biesiot@usm.edu
Lee, C, , Univ. of Wisconsin-Madison, Madison, , carollee@facstaff.wisc.edu
 
LIPID CLASSES OF THREE GEOGRAPHICALLY DIFFERENT POPULATIONS OF EURYTEMORA AFFINIS (P0PPE) REARED UNDER CONSTANT LABORATORY CONDITIONS
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Eurytemora affinis is a cosmopolitan copepod capable of invasion into freshwater habitats. Natural populations vary in diet preference, production of diapause eggs and lipid storage. Copepods from Quebec, Maryland and South Carolina populations were reared for 6 months under identical laboratory conditions (13 C, 15 PSU) and fed equal amounts of the same phytoplankton. Each population produced 6+ viable generations. Preliminary results demonstrate some differences in lipid classes betwen sexes and among populations. Dominant lipid classes (>20% of total lipids) were wax esters/sterol esters and triacylglycerols for the Quebec copepods, polar lipids for the Maryland copepods, and triacylglycerols and polar lipids for the South Carolina copepods. These results suggest that differences in lipid composition may be genetically based in these morphologically indistinct and genetically proximate populations.