Abundance and Distribution of Krill in the Ice Edge Zone of the Weddell Sea, Austral Spring 1983
The effect of the ice edge zone on the abundance and distribution of Antarctic krill was investigated by acoustic and net sampling methods in the northwestern Weddell Sea during austral spring, 1983. The dominant acoustic target was Euphausia superba which occurred over the entire study area in the...
Published in: | Deep Sea Research Part A. Oceanographic Research Papers |
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Digital Commons @ University of South Florida
1988
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Online Access: | https://digitalcommons.usf.edu/msc_facpub/829 https://doi.org/10.1016/0198-0149(88)90055-6 |
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ftusouthflorida:oai:digitalcommons.usf.edu:msc_facpub-1872 2023-07-30T03:57:18+02:00 Abundance and Distribution of Krill in the Ice Edge Zone of the Weddell Sea, Austral Spring 1983 Daly, Kendra L. Macaulay, Michael C. 1988-01-01T08:00:00Z https://digitalcommons.usf.edu/msc_facpub/829 https://doi.org/10.1016/0198-0149(88)90055-6 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/829 doi:10.1016/0198-0149(88)90055-6 https://doi.org/10.1016/0198-0149(88)90055-6 Marine Science Faculty Publications Life Sciences article 1988 ftusouthflorida https://doi.org/10.1016/0198-0149(88)90055-6 2023-07-13T20:46:05Z The effect of the ice edge zone on the abundance and distribution of Antarctic krill was investigated by acoustic and net sampling methods in the northwestern Weddell Sea during austral spring, 1983. The dominant acoustic target was Euphausia superba which occurred over the entire study area in the upper 100 m of the water column, either in aggregations or loosely defined layers. The vertical depth distribution under the pack ice was similar to that of open water. Average krill biomass under the ice ranged from 1 to 68 g m−2 and in open water range from 10 to 100 g m−2. Another euphausiid, Thysanoessa macrura, appeared to be ubiquitous but was much less abundant than E. superba. T. macrura also formed aggregations. All stages were found in open water, but only adults and juveniles under the ice. A few adults and larvae of a third euphausiid, E. frigida, were found only in open water. Salps, which were abundant in open water, were not present under the pack ice. The pack ice directly influenced the abundance and distribution of young krill. Juvenile E. superba were much more abundant under the ice than in open water north of the ice edge. Numerous observations were made of juvenile krill feeding on the undersurface of ice floes where chlorophyll concentrations were much greater than in the water column below. These observations appear to indicate that the pack ice serves as a giant nursery area for young krill, providing a refugium from predators as well as a vast food resource that may be critical to the survival of overwintering juvenile E. superba. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Thysanoessa macrura Weddell Sea University of South Florida St. Petersburg: Digital USFSP Antarctic Austral Weddell Weddell Sea Deep Sea Research Part A. Oceanographic Research Papers 35 1 21 41 |
institution |
Open Polar |
collection |
University of South Florida St. Petersburg: Digital USFSP |
op_collection_id |
ftusouthflorida |
language |
unknown |
topic |
Life Sciences |
spellingShingle |
Life Sciences Daly, Kendra L. Macaulay, Michael C. Abundance and Distribution of Krill in the Ice Edge Zone of the Weddell Sea, Austral Spring 1983 |
topic_facet |
Life Sciences |
description |
The effect of the ice edge zone on the abundance and distribution of Antarctic krill was investigated by acoustic and net sampling methods in the northwestern Weddell Sea during austral spring, 1983. The dominant acoustic target was Euphausia superba which occurred over the entire study area in the upper 100 m of the water column, either in aggregations or loosely defined layers. The vertical depth distribution under the pack ice was similar to that of open water. Average krill biomass under the ice ranged from 1 to 68 g m−2 and in open water range from 10 to 100 g m−2. Another euphausiid, Thysanoessa macrura, appeared to be ubiquitous but was much less abundant than E. superba. T. macrura also formed aggregations. All stages were found in open water, but only adults and juveniles under the ice. A few adults and larvae of a third euphausiid, E. frigida, were found only in open water. Salps, which were abundant in open water, were not present under the pack ice. The pack ice directly influenced the abundance and distribution of young krill. Juvenile E. superba were much more abundant under the ice than in open water north of the ice edge. Numerous observations were made of juvenile krill feeding on the undersurface of ice floes where chlorophyll concentrations were much greater than in the water column below. These observations appear to indicate that the pack ice serves as a giant nursery area for young krill, providing a refugium from predators as well as a vast food resource that may be critical to the survival of overwintering juvenile E. superba. |
format |
Article in Journal/Newspaper |
author |
Daly, Kendra L. Macaulay, Michael C. |
author_facet |
Daly, Kendra L. Macaulay, Michael C. |
author_sort |
Daly, Kendra L. |
title |
Abundance and Distribution of Krill in the Ice Edge Zone of the Weddell Sea, Austral Spring 1983 |
title_short |
Abundance and Distribution of Krill in the Ice Edge Zone of the Weddell Sea, Austral Spring 1983 |
title_full |
Abundance and Distribution of Krill in the Ice Edge Zone of the Weddell Sea, Austral Spring 1983 |
title_fullStr |
Abundance and Distribution of Krill in the Ice Edge Zone of the Weddell Sea, Austral Spring 1983 |
title_full_unstemmed |
Abundance and Distribution of Krill in the Ice Edge Zone of the Weddell Sea, Austral Spring 1983 |
title_sort |
abundance and distribution of krill in the ice edge zone of the weddell sea, austral spring 1983 |
publisher |
Digital Commons @ University of South Florida |
publishDate |
1988 |
url |
https://digitalcommons.usf.edu/msc_facpub/829 https://doi.org/10.1016/0198-0149(88)90055-6 |
geographic |
Antarctic Austral Weddell Weddell Sea |
geographic_facet |
Antarctic Austral Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Thysanoessa macrura Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Thysanoessa macrura Weddell Sea |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/829 doi:10.1016/0198-0149(88)90055-6 https://doi.org/10.1016/0198-0149(88)90055-6 |
op_doi |
https://doi.org/10.1016/0198-0149(88)90055-6 |
container_title |
Deep Sea Research Part A. Oceanographic Research Papers |
container_volume |
35 |
container_issue |
1 |
container_start_page |
21 |
op_container_end_page |
41 |
_version_ |
1772816737948925952 |