Albers, C. Alfred-Wegener-Institut, calbers@awi-bremerhaven.de
Kattner, G. Alfred-Wegener-Institut, gkattner@awi-bremerhaven.de

 
LIPID COMPOSITIONS OF DOMINANT ARCTIC AND ANTARCTIC OITHONIDAE AND ONCAEIDAE
 
Lipids play a key role as energy reserves in marine organisms and in the transfer of energy among trophic levels. Oithona and Oncaea species are small copepods but due to their high abundance they are of major importance in the marine food web. The results presented are the first report on the fatty acid/alcohol compositions of Oithona similis, Oncaea curvata and O. antarctica from the Antarctic and O. similis and O. borealis from the Arctic. The lipids of all species consisted mainly of wax esters. The principle fatty acid is the monounsaturate 18:1(n-9) together with 16:0, 20:5(n-3) and 22:6(n-3). The fatty alcohols were dominated by 14:0 and 16:0 and partially by 20:1(n-9). The Arctic species O. similis had a lipid composition which was different compared to that of the other species: it contained significant levels of the 12:0 and the 20:1(n-9) fatty acids, and its alcohol composition was predominated by 20:1(n-9). The pronounced wax ester storage clearly shows the dependence on lipid reserves which is typical for copepods in high latitudes due to the strongly pulsed primary production. The deviating compositions indicate the existence of very different lipid storage mechanisms probably reflecting different life cycles and strategies.
 
Day: Tuesday, Feb. 2
Time: Poster
Location: Sweeney Center
 
Code: SS23TU0702S