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

1999 ◽  
Vol 181 ◽  
pp. 177-188 ◽  
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

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

2000 ◽  
Vol 57 (S3) ◽  
pp. 31-37 ◽  
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.

scholarly journals Spatial and temporal variability in the structure of aggregations of Antarctic krill (Euphausia superba) around South Georgia, 1997–1999

2011 ◽  
Vol 68 (3) ◽  
pp. 489-498 ◽  
Author(s):  
Martin J. Cox ◽  
Jonathan L. Watkins ◽  
Keith Reid ◽  
Andrew S. Brierley
Keyword(s):  
Temporal Variability ◽  
Antarctic Krill ◽  
Marine Ecosystem ◽  
Euphausia Superba ◽  
Spatial And Temporal Variability ◽  
Dual Frequency ◽  
South Georgia ◽  
Estimation System ◽  
Antarctic Krill Euphausia Superba

Abstract Cox, M. J., Watkins, J. L., Reid, K., and Brierley, A. S. 2011. Spatial and temporal variability in the structure of aggregations of Antarctic krill (Euphausia superba) around South Georgia, 1997–1999. – ICES Journal of Marine Science, 68: . Antarctic krill are important in the South Georgia (54°S 35°W) marine ecosystem. They form aggregations that vary widely in packing density (<1 to 1000 s of individuals m−3), length (tens to thousands of metres), and height (tens of metres). Acoustic surveys are often used to estimate krill biomass and provide data that give insight into aggregation structure. Using dual-frequency (38 and 120 kHz) acoustic data collected during six surveys conducted around South Georgia during the 1997, 1998, and 1999 austral summers, we isolated 2990 aggregations by applying the Shoal Analysis and Patch Estimation System algorithm in Echoview and a krill-length-dependent acoustic identifier (ΔSv120–38). Multivariate cluster (partition) analysis was applied to metrics from each of the aggregations, resulting in three aggregation types with an overall proportional split of 0.28:0.28:0.44. Types 1 and 3 had low mean densities (<2 g m−3), whereas Type 2 had a mean density of 94 g m−3. Intersurvey differences were found between the effort-corrected numbers of aggregation types (p = 2.5e−6), and between on- and off-continental shelf areas (p = 1.5e−7), with a greater number of Type 2 aggregations being found on-shelf. The findings suggest intersurvey variation in krill catchability, with krill being more likely to be caught on-shelf.

scholarly journals Recruitment of Antarctic krill Euphausia superba in the South Georgia region: adult fecundity and the fate of larvae

2007 ◽  
Vol 331 ◽  
pp. 161-179 ◽  
Author(s):  
GA Tarling ◽  
J Cuzin-Roudy ◽  
SE Thorpe ◽  
RS Shreeve ◽  
P Ward ◽  
...  
Keyword(s):  
Antarctic Krill ◽  
Euphausia Superba ◽  
The South ◽  
South Georgia ◽  
Antarctic Krill Euphausia Superba

scholarly journals Antarctic Krill Lipid and Fatty acid Content Variability is Associated to Satellite Derived Chlorophyll a and Sea Surface Temperatures

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Nicole Hellessey ◽  
Robert Johnson ◽  
Jessica A. Ericson ◽  
Peter D. Nichols ◽  
So Kawaguchi ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Chlorophyll A ◽  
Acid Content ◽  
Antarctic Krill ◽  
Fatty Acid Content ◽  
Sea Surface ◽  
Sea Surface Temperatures ◽  
Surface Temperatures

Lipid, sterol and fatty acid composition of antarctic krill (Euphausia superba Dana)

Lipids ◽  
1984 ◽  
Vol 19 (11) ◽  
pp. 821-827 ◽  
Author(s):  
H. Fricke ◽  
G. Gercken ◽  
W. Schreiber ◽  
J. Oehlenschläger
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Antarctic Krill ◽  
Euphausia Superba ◽  
Antarctic Krill Euphausia Superba
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