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Ecological investigations on the zoo plankton community of balsfjorden northern norway lipids in the euphausiids thysanoessa raschi and thysanoessa inermis during spring



Ecological investigations on the zoo plankton community of balsfjorden northern norway lipids in the euphausiids thysanoessa raschi and thysanoessa inermis during spring



Marine Biology 68(1): 97-102



Dry body weights, lipid levels and lipid compositions were measured in I- and II-group T. raschi (M. Sars) and T. inermis (Kroyer) collected in April-May, 1980 in Balsfjorden, north Norway. Dry body weights were minimal in late April but had doubled by mid-May for I-group T. raschi and for I- and II-group T. inermis. II-group T. raschi had increased its dry weight by < 50% by mid-May. Lipid accounted for .apprx. 10% of the dry body weight throughout the period, with free fatty acids and phospholipids being the dominant classes. An exception occurred for II-group T. inermis in mid-May, when wax esters were present in substantial amounts. Wax esters were present only in small amounts at other times and triacylglycerols were negligible. The free fatty acids in I-group T. raschi and I-group T. inermis in late April were deficient in polyunsaturates; by mid-May the free fatty acids were rich in polyunsaturates. II-group T. raschi and II-group T. inermis had free fatty acids rich in polyunsaturates throughout the period of study. The wax esters present in II-group T. inermis in mid-May consisted mainly of 16:0 and 14:0 alcohols esterified to 18:1 fatty acid. The traces of wax esters present in T. rashi did not contain significant amounts of phytol. Results are discussed with respect to the metabolic activities of the 2 euphausiids and their trophic positions in terms of different dietary inputs.

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