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The lipid composition of Euphausla superba Dana in relation to the nutritional value of Phaeocystis pouchetii (Hariot) Lagerheim
Citation
Virtue, P and Nichols, P and Nicol, S and McMinn, A and Sikes, E, The lipid composition of Euphausla superba Dana in relation to the nutritional value of Phaeocystis pouchetii (Hariot) Lagerheim, Antarctic Science, 5, (2) pp. 169-177. ISSN 0954-1020 (1993) [Refereed Article]
Copyright Statement
Copyright 1993 Antarctic Science Ltd.
DOI: doi:10.1017/S0954102093000239
Abstract
The fatty acid profiles ofEuphausiusuperba, the Antarctic prymnesiophyte, Phaeocystispouchetii, and
a temperate diatom, Phaeodactylum tricornutum were analysed and compared. The lipid content, lipid class, fatty
acid and sterol composition ofE. superba fed on each cultured phytoplankton and amixed diet ofboth species, were
determined. No significant difference was found between total lipid levels of E. superba reared on each of these
different diets. Phaeocystispouchetii, although deficient in a number of the essential fatty acids, is apparently an
adequate food source for E. superba. The proportion of polyenoic fatty acids varied within lipid classes although
there was no significant difference between levels of the long chain polyunsaturate 20:5(n-3) in the total lipid of
E. superba fed on these diets. This acid was found to be less than 1% of the total lipid in Phaeocystispouchetii
compared to 37% in Phaeodactyhm tricornutum. This suggests that krill may possess the ability to convert
exogenousshorter chainfatty acids to 20:5(n-3) and 22:6(n-3). Significantdifferencesweredetectedin theisomeric
ratio of 16:1(n-7~)/16:0b etween krill fed the diatom compared to the prymnesiophyte diet. Significant differences
were also detected in several shorter chain fatty acids and between fatty acids within their lipid classes. Such
differences may have the potential to be used as biochemical signatures to provide information on food sources and
possible feeding grounds of E. superba. Phaeocystispouchetii in a very late stationary phase, although not used
in this feeding study, was found to contain 11 % of 22:6(n-3) for which there are few substantive sources in natural
algal populations.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | Euphausia superba, Phaeocystis pouchetii, Phaeodactylum tricornutllm, lipids, fatty acids, food |
| 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 |
| UTAS Author: | Virtue, P (Associate Professor Patti Virtue) |
| UTAS Author: | McMinn, A (Professor Andrew McMinn) |
| ID Code: | 90429 |
| Year Published: | 1993 |
| Web of Science® Times Cited: | 48 |
| Deposited By: | IMAS Research and Education Centre |
| Deposited On: | 2014-04-03 |
| Last Modified: | 2014-07-01 |
| Downloads: | 0 |
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