Influence of Physical and Biological Mesoscale Dynamics on the Seasonal Distribution and Behavior of Euphausia superba in the Antarctic Marginal Ice Zone
The influence of day length, currents, sea ice presence, seawater temperature and salinity, chlorophyll a, particulate organic carbon, and predators was investigated in relation to the distribution and behavior of life history stages of Euphausia superba Dana in the marginal ice zone of the Weddell...
Published in: | Marine Ecology Progress Series |
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Digital Commons @ University of South Florida
1991
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Online Access: | https://digitalcommons.usf.edu/msc_facpub/831 https://doi.org/10.3354/meps079037 |
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ftusouthflorida:oai:digitalcommons.usf.edu:msc_facpub-1870 2023-07-30T03:57:18+02:00 Influence of Physical and Biological Mesoscale Dynamics on the Seasonal Distribution and Behavior of Euphausia superba in the Antarctic Marginal Ice Zone Daly, Kendra L. Macaulay, Michael C. 1991-12-01T08:00:00Z https://digitalcommons.usf.edu/msc_facpub/831 https://doi.org/10.3354/meps079037 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/831 doi:10.3354/meps079037 https://doi.org/10.3354/meps079037 Marine Science Faculty Publications Life Sciences article 1991 ftusouthflorida https://doi.org/10.3354/meps079037 2023-07-13T20:46:05Z The influence of day length, currents, sea ice presence, seawater temperature and salinity, chlorophyll a, particulate organic carbon, and predators was investigated in relation to the distribution and behavior of life history stages of Euphausia superba Dana in the marginal ice zone of the Weddell and Scotia Seas during autumn, winter, and spring. Physical processes control the extent of ice cover, the magnitude and location of food, and the distribution of pack ice predators, however, physical processes did not appear to directly affect krill. Instead, the seasonal distribution and behavior of krill was interpreted to be a function of the need to acquire food and avoid predators. These 2 factors also are hypothesized to be the proximate cause of swarming during our study. Seasonal sea ice plays an integral role m the ecology of krill. Ice-edge blooms are an important and predictable food supply, particularly for reproducing adults and first-feeding larvae. Ice floes provide protection for larvae and juveniles, and sea ice biota, a widespread food source, are important to the survival of larvae during winter. In the marginal ice zone, overwintering strategies of adults included regression to an immature (sub-adult) stage, reduction of metabolic rate, and omnivorous feeding m the water column. Adults were not observed feeding on the undersurface of ice floes probably because of increased risk of predation from pack ice predators. However, adult krill may migrate deeper into the pack ice in winter and also feed on ice biota. We conclude that sea ice biota act as a stabilizing mechanism against extreme seasonal oscillations of food supply for overwintering krill, thus contributing to the persistence of populations of E. superba. Article in Journal/Newspaper Antarc* Antarctic Euphausia superba Sea ice University of South Florida St. Petersburg: Digital USFSP Antarctic The Antarctic Weddell Marine Ecology Progress Series 79 37 66 |
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. Influence of Physical and Biological Mesoscale Dynamics on the Seasonal Distribution and Behavior of Euphausia superba in the Antarctic Marginal Ice Zone |
topic_facet |
Life Sciences |
description |
The influence of day length, currents, sea ice presence, seawater temperature and salinity, chlorophyll a, particulate organic carbon, and predators was investigated in relation to the distribution and behavior of life history stages of Euphausia superba Dana in the marginal ice zone of the Weddell and Scotia Seas during autumn, winter, and spring. Physical processes control the extent of ice cover, the magnitude and location of food, and the distribution of pack ice predators, however, physical processes did not appear to directly affect krill. Instead, the seasonal distribution and behavior of krill was interpreted to be a function of the need to acquire food and avoid predators. These 2 factors also are hypothesized to be the proximate cause of swarming during our study. Seasonal sea ice plays an integral role m the ecology of krill. Ice-edge blooms are an important and predictable food supply, particularly for reproducing adults and first-feeding larvae. Ice floes provide protection for larvae and juveniles, and sea ice biota, a widespread food source, are important to the survival of larvae during winter. In the marginal ice zone, overwintering strategies of adults included regression to an immature (sub-adult) stage, reduction of metabolic rate, and omnivorous feeding m the water column. Adults were not observed feeding on the undersurface of ice floes probably because of increased risk of predation from pack ice predators. However, adult krill may migrate deeper into the pack ice in winter and also feed on ice biota. We conclude that sea ice biota act as a stabilizing mechanism against extreme seasonal oscillations of food supply for overwintering krill, thus contributing to the persistence of populations of 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 |
Influence of Physical and Biological Mesoscale Dynamics on the Seasonal Distribution and Behavior of Euphausia superba in the Antarctic Marginal Ice Zone |
title_short |
Influence of Physical and Biological Mesoscale Dynamics on the Seasonal Distribution and Behavior of Euphausia superba in the Antarctic Marginal Ice Zone |
title_full |
Influence of Physical and Biological Mesoscale Dynamics on the Seasonal Distribution and Behavior of Euphausia superba in the Antarctic Marginal Ice Zone |
title_fullStr |
Influence of Physical and Biological Mesoscale Dynamics on the Seasonal Distribution and Behavior of Euphausia superba in the Antarctic Marginal Ice Zone |
title_full_unstemmed |
Influence of Physical and Biological Mesoscale Dynamics on the Seasonal Distribution and Behavior of Euphausia superba in the Antarctic Marginal Ice Zone |
title_sort |
influence of physical and biological mesoscale dynamics on the seasonal distribution and behavior of euphausia superba in the antarctic marginal ice zone |
publisher |
Digital Commons @ University of South Florida |
publishDate |
1991 |
url |
https://digitalcommons.usf.edu/msc_facpub/831 https://doi.org/10.3354/meps079037 |
geographic |
Antarctic The Antarctic Weddell |
geographic_facet |
Antarctic The Antarctic Weddell |
genre |
Antarc* Antarctic Euphausia superba Sea ice |
genre_facet |
Antarc* Antarctic Euphausia superba Sea ice |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/831 doi:10.3354/meps079037 https://doi.org/10.3354/meps079037 |
op_doi |
https://doi.org/10.3354/meps079037 |
container_title |
Marine Ecology Progress Series |
container_volume |
79 |
container_start_page |
37 |
op_container_end_page |
66 |
_version_ |
1772816741630476288 |