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Ecological investigations on the zoo plankton community in balsfjorden northern norway lipids and fatty acids in meganyctiphanes norvegica thysanoessa raschi and thysanoessa inermis during mid winter



Ecological investigations on the zoo plankton community in balsfjorden northern norway lipids and fatty acids in meganyctiphanes norvegica thysanoessa raschi and thysanoessa inermis during mid winter



Marine Biology 62(2-3): 131-138



Total lipid of M. norvegica (M. Sars) contained 53% triacylglycerols and traces of wax esters, that of T. raschi (M. Sars) contained 44% triacylglycerols and 10% wax esters and that of T. inermis (Kroyer) contained 28% triacylglycerols and 40% wax esters. The triacylglycerols of M. norvegica were rich in 20:1 and 22:1 fatty acids, and its traces of wax esters resembled those of calanoid copepods. The triacylglycerols of both Thysanoessa spp. were deficient in 20:1 and 22:1 fatty acids but were richer in 16:1 (n-7) and 18:1 (n-7) acids than those of M. norvegica. The wax esters of T. raschi contained phytol as almost the only fatty alcohol and were rich in 16:0 and 18:1 (n-9) fatty acids. The wax esters of T. inermis contained mainly 16:0 and 14:0 fatty alcohols with lesser amounts of phytol and their dominant fatty acid was 18:1, especially the (n-9) isomer. The triacylglycerols of T. intermis had 18:4 (n-3) as the major polyunsaturated fatty acid. From these and other aspects of fatty acid and fatty alcohol analyses it is concluded that a major foodstuff of M. norvegica in Balsfjorden is wax ester-rich calanoid copepods. T. rashci and espcially T. inermis had much more preference for phytoplanktonic food. Results are discussed in terms of knowledge of the lipid chemistry of krill in the northern and southern hemispheres.

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