Effects of sea ice cover on the swarming behaviour of Antarctic krill, Euphausia superba
Much of the distribution range of Antarctic krill, Euphausia superba, is covered by permanent or seasonal sea ice. Sea ice extent has been implicated as a major factor affecting reproductive success of krill and krill dispersal, but little is known of the way in which ice cover may influence krill b...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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2000
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Online Access: | http://dx.doi.org/10.1139/f00-169 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-169 |
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crcansciencepubl:10.1139/f00-169 2024-03-03T08:39:08+00:00 Effects of sea ice cover on the swarming behaviour of Antarctic krill, Euphausia superba Brierley, Andrew S Watkins, Jonathan L 2000 http://dx.doi.org/10.1139/f00-169 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-169 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 57, issue S3, page 24-30 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2000 crcansciencepubl https://doi.org/10.1139/f00-169 2024-02-07T10:53:33Z Much of the distribution range of Antarctic krill, Euphausia superba, is covered by permanent or seasonal sea ice. Sea ice extent has been implicated as a major factor affecting reproductive success of krill and krill dispersal, but little is known of the way in which ice cover may influence krill behaviour. This is largely because the under-ice environment is difficult to study. Ship-borne echosounders have, however, detected krill aggregations in midwater in ice-covered regions. We used 120-kHz echograms collected underway during three cruises that crossed ice-covered and adjacent open waters in the Bellingshausen, Weddell, and Scotia seas to compare morphological and next-neighbour characteristics of krill swarms within and without ice cover. No significant differences were detected between the horizontal and vertical extent of swarms or swarm next-neighbour distance in ice-covered or open waters. Distributions of swarm mid-depths did, however, differ significantly between ice-covered and open areas in all three seas, although the direction of difference was not the same in each instance: swarms in the Weddell and Scotia seas were generally shallower under ice than in open water, whereas in the Bellingshausen Sea the opposite prevailed. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Bellingshausen Sea Euphausia superba Sea ice Canadian Science Publishing Antarctic Bellingshausen Sea Weddell Canadian Journal of Fisheries and Aquatic Sciences 57 S3 24 30 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Brierley, Andrew S Watkins, Jonathan L Effects of sea ice cover on the swarming behaviour of Antarctic krill, Euphausia superba |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Much of the distribution range of Antarctic krill, Euphausia superba, is covered by permanent or seasonal sea ice. Sea ice extent has been implicated as a major factor affecting reproductive success of krill and krill dispersal, but little is known of the way in which ice cover may influence krill behaviour. This is largely because the under-ice environment is difficult to study. Ship-borne echosounders have, however, detected krill aggregations in midwater in ice-covered regions. We used 120-kHz echograms collected underway during three cruises that crossed ice-covered and adjacent open waters in the Bellingshausen, Weddell, and Scotia seas to compare morphological and next-neighbour characteristics of krill swarms within and without ice cover. No significant differences were detected between the horizontal and vertical extent of swarms or swarm next-neighbour distance in ice-covered or open waters. Distributions of swarm mid-depths did, however, differ significantly between ice-covered and open areas in all three seas, although the direction of difference was not the same in each instance: swarms in the Weddell and Scotia seas were generally shallower under ice than in open water, whereas in the Bellingshausen Sea the opposite prevailed. |
format |
Article in Journal/Newspaper |
author |
Brierley, Andrew S Watkins, Jonathan L |
author_facet |
Brierley, Andrew S Watkins, Jonathan L |
author_sort |
Brierley, Andrew S |
title |
Effects of sea ice cover on the swarming behaviour of Antarctic krill, Euphausia superba |
title_short |
Effects of sea ice cover on the swarming behaviour of Antarctic krill, Euphausia superba |
title_full |
Effects of sea ice cover on the swarming behaviour of Antarctic krill, Euphausia superba |
title_fullStr |
Effects of sea ice cover on the swarming behaviour of Antarctic krill, Euphausia superba |
title_full_unstemmed |
Effects of sea ice cover on the swarming behaviour of Antarctic krill, Euphausia superba |
title_sort |
effects of sea ice cover on the swarming behaviour of antarctic krill, euphausia superba |
publisher |
Canadian Science Publishing |
publishDate |
2000 |
url |
http://dx.doi.org/10.1139/f00-169 http://www.nrcresearchpress.com/doi/pdf/10.1139/f00-169 |
geographic |
Antarctic Bellingshausen Sea Weddell |
geographic_facet |
Antarctic Bellingshausen Sea Weddell |
genre |
Antarc* Antarctic Antarctic Krill Bellingshausen Sea Euphausia superba Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Krill Bellingshausen Sea Euphausia superba Sea ice |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 57, issue S3, page 24-30 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f00-169 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
57 |
container_issue |
S3 |
container_start_page |
24 |
op_container_end_page |
30 |
_version_ |
1792494546615009280 |