Factors determining the hatching success of Antarctic krill Euphausia superba embryo: lipid and fatty acid composition

Antarctic (Euphausia superba) and northern krill (Meganyctiphanes norvegica) are characterised by large-scale spatial distributions. Euphausia superba is limited to the Southern Ocean, while M. norvegica is present from the Arctic Ocean to the Mediterranean Sea. Euphausia superba structural lipids showed little mesoscale variability. Specific differences between phosphatidylcholine and phosphatidylethanolamine fatty acid composition exceeded variability related to sampling stations. On a larger scale (Southern Ocean), fatty acid composition of both total polar lipids and phosphatidylcholine confirmed the reduced level of regional variability. Similar comparisons between female M. norvegica collected at two extreme sites in terms of temperature regime (Kattegat and Ligurian Sea) during two seasons (spring-summer and fall-winter) suggested a more complex picture. Levels of phosphatidylethanolamine, lysophosphatidylcholine, and diphosphatidylglycerol showed significant differences between sites. During spring- summer, a lower content of phosphatidylethanolamine and lysophosphatidylcholine was observed for the Ligurian Sea population. Fatty acid composition of total polar lipids was significantly different at both sites. Comparisons between spring-summer populations at both sites showed higher percentages of 22:6n-3 and a lower content in saturated and monoenoic acids for the Ligurian Sea, suggesting some degree of adaptation to temperature regime.

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Near-future ocean acidification does not alter the lipid content and fatty acid composition of adult Antarctic krill

Scientific Reports ◽

10.1038/s41598-019-48665-5 ◽

2019 ◽

Vol 9 (1) ◽

Author(s):

Jessica A. Ericson ◽

Nicole Hellessey ◽

So Kawaguchi ◽

Peter D. Nichols ◽

Stephen Nicol ◽

...

Keyword(s):

Fatty Acid Composition ◽

Fatty Acid ◽

Ocean Acidification ◽

Acid Composition ◽

Lipid Content ◽

Antarctic Krill ◽

Near Future

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Seasonal and interannual variations in the fatty acid composition of adult Euphausia superba Dana, 1850 (Euphausiacea) samples derived from the Scotia Sea krill fishery

Journal of Crustacean Biology ◽

10.1093/jcbiol/ruy032 ◽

2018 ◽

Cited By ~ 5

Author(s):

Jessica A Ericson ◽

Nicole Hellessey ◽

Peter D Nichols ◽

So Kawaguchi ◽

Stephen Nicol ◽

...

Keyword(s):

Fatty Acid Composition ◽

Fatty Acid ◽

Acid Composition ◽

Euphausia Superba ◽

Interannual Variations ◽

Scotia Sea ◽

Seasonal And Interannual Variations

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Fatty acid content of Antarctic krill Euphausia superba at South Georgia related to regional populations and variations in diet

Marine Ecology Progress Series ◽

10.3354/meps181177 ◽

1999 ◽

Vol 181 ◽

pp. 177-188 ◽

Cited By ~ 49

Author(s):

GC Cripps ◽

JL Watkins ◽

HJ Hill ◽

A Atkinson

Keyword(s):

Fatty Acid ◽

Acid Content ◽

Antarctic Krill ◽

Fatty Acid Content ◽

Euphausia Superba ◽

South Georgia ◽

Antarctic Krill Euphausia Superba

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Fatty acid composition as an indicator of carnivory in Antarctic krill, Euphausia superba

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f00-167 ◽

2000 ◽

Vol 57 (S3) ◽

pp. 31-37 ◽

Cited By ~ 71

Author(s):

G C Cripps ◽

A Atkinson

Keyword(s):

Fatty Acids ◽

Fatty Acid ◽

Antarctic Krill ◽

Saturated Fatty Acids ◽

Euphausia Superba ◽

Monounsaturated Fatty Acids ◽

Pufa Content ◽

South Georgia ◽

Total Fatty Acids ◽

Antarctic Krill Euphausia Superba

In a previous study at South Georgia, carnivory was invoked as a cause of high polyunsaturated fatty acid (PUFA) content of Antarctic krill, Euphausia superba. To examine this, krill were sampled and fed for 16 days exclusively on the locally abundant copepod Drepanopus forcipatus. After 16 days, the krill had increased their PUFA content from 28 to 54% of the total fatty acids. Concurrently, monounsaturated fatty acids (MUFAs) and saturated fatty acids (SFAs) decreased from 41 to 27%. Thus, the krill appeared to accumulate PUFAs as reflected in their diet of D. forcipatus, which also had a relatively high PUFA content (50%). Overall, the results support omnivorous feeding by krill at South Georgia during nonbloom periods. We propose that the ratio of PUFA to SFA content may be used to detect carnivory in the recent feeding history of krill and suggest that this may be an index which could be applied to other zooplankton.

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