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Use of fatty acids as dietary indicators in northern krill, , Meganyctiphanes norvegica, from northeastern Atlantic, Kattegat, and Mediterranean waters

Citation

Virtue, P and Mayzaud, P and Albessard, E and Nichols, PD, Use of fatty acids as dietary indicators in northern krill, , Meganyctiphanes norvegica, from northeastern Atlantic, Kattegat, and Mediterranean waters, Canadian Journal of Fisheries and Aquatic Sciences, 57, (3) pp. 104-111. ISSN 0706-652X (2000) [Refereed Article]


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Copyright Statement

Copyright 2000 NRC Canada

DOI: doi:10.1139/f00-182

Abstract

Fatty acids of the triacylglycerol (TG) and polar lipid (PL) fractions were compared from northern krill, Meganyctiphanes norvegica, sampled in the Clyde Sea in the Atlantic, the Kattegat at the Alkor Deep, and the Ligurian Sea in the Mediterranean. Possible biotransformations of fatty acids in the food chain were examined in mixed zooplankton and krill faecal material from the Ligurian Sea and Kattegat. The Ligurian Sea population was distinguished from the Kattegat and Clyde Sea populations in terms of both TG and PL fatty acid profiles. The Kattegat and Clyde Sea populations were separated from each other in terms of their PL fatty acid profiles only. Krill sampled in winter from all sites had significantly higher levels of 20:1 and 22:1 fatty acids in the TG fraction (9–17%) than krill sampled in summer (1–10%). These fatty acids in particular indicate carnivorous dietary input, as they are found in high levels in copepods, which are the major prey species of M. norvegica. Levels of 22:6(n–3) were significantly higher than 20:5(n–3) in Ligurian krill, which, together with other specific marker fatty acids, suggested a predominance of dinoflagellates and other nondiatom species in their diet. TG fatty acids in Kattegat and Clyde Sea krill indicate a predominance of diatoms in the diet.

Item Details

Item Type:Refereed Article
Keywords:Fatty acids, diet, krill
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity
Author:Virtue, P (Associate Professor Patti Virtue)
Author:Nichols, PD (Dr Peter Nichols)
ID Code:90445
Year Published:2000
Deposited By:IMAS Research and Education Centre
Deposited On:2014-04-04
Last Modified:2014-07-02
Downloads:0

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