Concordance of interannual fluctuations in acoustically estimated densities of Antarctic krill around South Georgia and Elephant Island: biological evidence of same-year teleconnections across the Scotia Sea
Acoustic estimates of the densities of Antarctic krill, Euphausia superba, in areas around South Georgia (SG) and Elephant Island (EI) were compared for seven austral summers between 1981 and 1997. Estimated densities of krill at SG were most often lower than at EI, although this may simply have bee...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/503045/ http://link.springer.com/article/10.1007%2Fs002270050583 https://doi.org/10.1007/s002270050583 |
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ftnerc:oai:nora.nerc.ac.uk:503045 2023-05-15T13:48:07+02:00 Concordance of interannual fluctuations in acoustically estimated densities of Antarctic krill around South Georgia and Elephant Island: biological evidence of same-year teleconnections across the Scotia Sea Brierley, A. S. Demer, D. A. Watkins, J. L. Hewitt, R. P. 1999 http://nora.nerc.ac.uk/id/eprint/503045/ http://link.springer.com/article/10.1007%2Fs002270050583 https://doi.org/10.1007/s002270050583 unknown Springer-Verlag Brierley, A. S.; Demer, D. A.; Watkins, J. L.; Hewitt, R. P. 1999 Concordance of interannual fluctuations in acoustically estimated densities of Antarctic krill around South Georgia and Elephant Island: biological evidence of same-year teleconnections across the Scotia Sea. Marine Biology, 134 (4). 675-681. https://doi.org/10.1007/s002270050583 <https://doi.org/10.1007/s002270050583> Publication - Article PeerReviewed 1999 ftnerc https://doi.org/10.1007/s002270050583 2023-02-04T19:37:38Z Acoustic estimates of the densities of Antarctic krill, Euphausia superba, in areas around South Georgia (SG) and Elephant Island (EI) were compared for seven austral summers between 1981 and 1997. Estimated densities of krill at SG were most often lower than at EI, although this may simply have been a function of differences in the survey and data-analysis techniques used at each site. More interestingly, the magnitudes of density and between-year gradients of density at each site were mirrored by those at the other location; for example 1991 and 1994 were years of very low krill density at both SG and EI. There was no apparent lag in changes in density between sites, and ranked between-year gradients in density at both locations were closely correlated. These pronounced similarities suggest that densities of krill at both locations are linked directly, and may be impacted by the same gross physical and biological factors (e.g. recruitment, dispersal and environmental variability) acting over the same temporal and spatial scales. The observed concordance also implies that the pelagic ecosystems at these widely separated sites (≃1500 km distant at opposite sides of the Scotia Sea) are not operating in isolation. Fluctuations in krill density were investigated with reference to cyclical variations in sea ice extent, and in air and sea-surface temperature. The resulting model suggests that the 1999/2000 austral summer will be one of low krill density. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Elephant Island Euphausia superba Scotia Sea Sea ice Natural Environment Research Council: NERC Open Research Archive Antarctic Austral Scotia Sea Elephant Island ENVELOPE(-55.184,-55.184,-61.085,-61.085) Marine Biology 134 4 675 681 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
Acoustic estimates of the densities of Antarctic krill, Euphausia superba, in areas around South Georgia (SG) and Elephant Island (EI) were compared for seven austral summers between 1981 and 1997. Estimated densities of krill at SG were most often lower than at EI, although this may simply have been a function of differences in the survey and data-analysis techniques used at each site. More interestingly, the magnitudes of density and between-year gradients of density at each site were mirrored by those at the other location; for example 1991 and 1994 were years of very low krill density at both SG and EI. There was no apparent lag in changes in density between sites, and ranked between-year gradients in density at both locations were closely correlated. These pronounced similarities suggest that densities of krill at both locations are linked directly, and may be impacted by the same gross physical and biological factors (e.g. recruitment, dispersal and environmental variability) acting over the same temporal and spatial scales. The observed concordance also implies that the pelagic ecosystems at these widely separated sites (≃1500 km distant at opposite sides of the Scotia Sea) are not operating in isolation. Fluctuations in krill density were investigated with reference to cyclical variations in sea ice extent, and in air and sea-surface temperature. The resulting model suggests that the 1999/2000 austral summer will be one of low krill density. |
format |
Article in Journal/Newspaper |
author |
Brierley, A. S. Demer, D. A. Watkins, J. L. Hewitt, R. P. |
spellingShingle |
Brierley, A. S. Demer, D. A. Watkins, J. L. Hewitt, R. P. Concordance of interannual fluctuations in acoustically estimated densities of Antarctic krill around South Georgia and Elephant Island: biological evidence of same-year teleconnections across the Scotia Sea |
author_facet |
Brierley, A. S. Demer, D. A. Watkins, J. L. Hewitt, R. P. |
author_sort |
Brierley, A. S. |
title |
Concordance of interannual fluctuations in acoustically estimated densities of Antarctic krill around South Georgia and Elephant Island: biological evidence of same-year teleconnections across the Scotia Sea |
title_short |
Concordance of interannual fluctuations in acoustically estimated densities of Antarctic krill around South Georgia and Elephant Island: biological evidence of same-year teleconnections across the Scotia Sea |
title_full |
Concordance of interannual fluctuations in acoustically estimated densities of Antarctic krill around South Georgia and Elephant Island: biological evidence of same-year teleconnections across the Scotia Sea |
title_fullStr |
Concordance of interannual fluctuations in acoustically estimated densities of Antarctic krill around South Georgia and Elephant Island: biological evidence of same-year teleconnections across the Scotia Sea |
title_full_unstemmed |
Concordance of interannual fluctuations in acoustically estimated densities of Antarctic krill around South Georgia and Elephant Island: biological evidence of same-year teleconnections across the Scotia Sea |
title_sort |
concordance of interannual fluctuations in acoustically estimated densities of antarctic krill around south georgia and elephant island: biological evidence of same-year teleconnections across the scotia sea |
publisher |
Springer-Verlag |
publishDate |
1999 |
url |
http://nora.nerc.ac.uk/id/eprint/503045/ http://link.springer.com/article/10.1007%2Fs002270050583 https://doi.org/10.1007/s002270050583 |
long_lat |
ENVELOPE(-55.184,-55.184,-61.085,-61.085) |
geographic |
Antarctic Austral Scotia Sea Elephant Island |
geographic_facet |
Antarctic Austral Scotia Sea Elephant Island |
genre |
Antarc* Antarctic Antarctic Krill Elephant Island Euphausia superba Scotia Sea Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Krill Elephant Island Euphausia superba Scotia Sea Sea ice |
op_relation |
Brierley, A. S.; Demer, D. A.; Watkins, J. L.; Hewitt, R. P. 1999 Concordance of interannual fluctuations in acoustically estimated densities of Antarctic krill around South Georgia and Elephant Island: biological evidence of same-year teleconnections across the Scotia Sea. Marine Biology, 134 (4). 675-681. https://doi.org/10.1007/s002270050583 <https://doi.org/10.1007/s002270050583> |
op_doi |
https://doi.org/10.1007/s002270050583 |
container_title |
Marine Biology |
container_volume |
134 |
container_issue |
4 |
container_start_page |
675 |
op_container_end_page |
681 |
_version_ |
1766248674473541632 |