Lipids in copepodite stages of <Emphasis Type="Italic">Calanus glacialis</Emphasis> |
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Authors: | Anette Wold Eva Leu Wojciech Walkusz Stig Falk-Petersen |
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Institution: | 1.Norwegian Polar Institute,Troms?,Norway;2.University of Oslo, Biological Institute,Oslo,Norway;3.Institute of Oceanology Polish Academy of Sciences,Sopot,Poland |
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Abstract: | Calanus glacialis is a key herbivore in Arctic shelf seas. It feeds on primary producers and accumulates large energy reserves, primarily as
wax esters. Lipid classes, fatty acids (FAs) and fatty alcohols (FAlcs) from copepodite stage II (CII) to adult females (AF)
from Kongsfjorden, Svalbard, were studied in May 2004. Wax esters were the dominating lipid class in all stages, ranging from
34% of total lipids in CII to 60% in CIII–CV. Triacylglycerols increased from 8% of total lipids in CII to 23% in AF. In the
earlier stages, 16:1n7 and 16:0 FAs and FAlcs were the major components of the neutral lipids, whereas the later stages were
mainly characterized by the long-chained FAs and FAlcs 20:1n9 and 22:1n11. C. glacialis utilizes the short spring bloom to build up lipid reserves, mainly as wax esters, and it also incorporates effectively essential
polyunsaturated FAs such as 20:5n3 and 22:6n3 in its polar lipids. |
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