Overwintering Development, Growth, and Feeding of Larval Euphausia superba in the Antarctic Marginal Ice Zone
Seasonal extent of pack ice has enormous influence on the Antarctic ecosystem. An investigation of the marginal ice zone in winter took place in the Scotia‐Weddell Seas, a major nursery ground for the Antarctic krill Euphausia superba. Krill larvae were abundant at the ice edge and on the undersurfa...
Published in: | Limnology and Oceanography |
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Digital Commons @ University of South Florida
1990
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Online Access: | https://digitalcommons.usf.edu/msc_facpub/830 https://doi.org/10.4319/lo.1990.35.7.1564 |
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ftunisfloridatam:oai:digitalcommons.usf.edu:msc_facpub-1871 2023-05-15T14:01:35+02:00 Overwintering Development, Growth, and Feeding of Larval Euphausia superba in the Antarctic Marginal Ice Zone Daly, Kendra L. 1990-11-01T08:00:00Z https://digitalcommons.usf.edu/msc_facpub/830 https://doi.org/10.4319/lo.1990.35.7.1564 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/830 https://doi.org/10.4319/lo.1990.35.7.1564 Marine Science Faculty Publications Life Sciences article 1990 ftunisfloridatam https://doi.org/10.4319/lo.1990.35.7.1564 2021-10-09T07:51:05Z Seasonal extent of pack ice has enormous influence on the Antarctic ecosystem. An investigation of the marginal ice zone in winter took place in the Scotia‐Weddell Seas, a major nursery ground for the Antarctic krill Euphausia superba. Krill larvae were abundant at the ice edge and on the undersurfaces of ice floes where the pack ice provided greater concentrations of food and a superior refuge compared to the water column. Larval development and growth, which is dependent on food supply, progressed steadily from June through August. In early June, furcilia stages F3–F5 were most abundant but, by August, F6s and juveniles predominated. Krill molted about every 20 d and growth rates (0.07 mm d−1) were similar to reported summer rates. Gut fullness indicated that 98% of the larvae were feeding both day and night. Ingestion rates based on gut pigments, however, were inadequate to meet respiratory requirements. Dietary analysis revealed that in addition to diatoms, larvae ingest protozoans and possibly detritus. If heterotrophic C is considered, larval krill feeding on sea ice biota could ingest sufficient C to support observed growth. Seasonal pack ice coverage over nursery grounds thus plays an important role in the overwintering of larval krill. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Sea ice Digital Commons University of South Florida (USF) Antarctic The Antarctic Weddell Limnology and Oceanography 35 7 1564 1576 |
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Open Polar |
collection |
Digital Commons University of South Florida (USF) |
op_collection_id |
ftunisfloridatam |
language |
unknown |
topic |
Life Sciences |
spellingShingle |
Life Sciences Daly, Kendra L. Overwintering Development, Growth, and Feeding of Larval Euphausia superba in the Antarctic Marginal Ice Zone |
topic_facet |
Life Sciences |
description |
Seasonal extent of pack ice has enormous influence on the Antarctic ecosystem. An investigation of the marginal ice zone in winter took place in the Scotia‐Weddell Seas, a major nursery ground for the Antarctic krill Euphausia superba. Krill larvae were abundant at the ice edge and on the undersurfaces of ice floes where the pack ice provided greater concentrations of food and a superior refuge compared to the water column. Larval development and growth, which is dependent on food supply, progressed steadily from June through August. In early June, furcilia stages F3–F5 were most abundant but, by August, F6s and juveniles predominated. Krill molted about every 20 d and growth rates (0.07 mm d−1) were similar to reported summer rates. Gut fullness indicated that 98% of the larvae were feeding both day and night. Ingestion rates based on gut pigments, however, were inadequate to meet respiratory requirements. Dietary analysis revealed that in addition to diatoms, larvae ingest protozoans and possibly detritus. If heterotrophic C is considered, larval krill feeding on sea ice biota could ingest sufficient C to support observed growth. Seasonal pack ice coverage over nursery grounds thus plays an important role in the overwintering of larval krill. |
format |
Article in Journal/Newspaper |
author |
Daly, Kendra L. |
author_facet |
Daly, Kendra L. |
author_sort |
Daly, Kendra L. |
title |
Overwintering Development, Growth, and Feeding of Larval Euphausia superba in the Antarctic Marginal Ice Zone |
title_short |
Overwintering Development, Growth, and Feeding of Larval Euphausia superba in the Antarctic Marginal Ice Zone |
title_full |
Overwintering Development, Growth, and Feeding of Larval Euphausia superba in the Antarctic Marginal Ice Zone |
title_fullStr |
Overwintering Development, Growth, and Feeding of Larval Euphausia superba in the Antarctic Marginal Ice Zone |
title_full_unstemmed |
Overwintering Development, Growth, and Feeding of Larval Euphausia superba in the Antarctic Marginal Ice Zone |
title_sort |
overwintering development, growth, and feeding of larval euphausia superba in the antarctic marginal ice zone |
publisher |
Digital Commons @ University of South Florida |
publishDate |
1990 |
url |
https://digitalcommons.usf.edu/msc_facpub/830 https://doi.org/10.4319/lo.1990.35.7.1564 |
geographic |
Antarctic The Antarctic Weddell |
geographic_facet |
Antarctic The Antarctic Weddell |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Sea ice |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/830 https://doi.org/10.4319/lo.1990.35.7.1564 |
op_doi |
https://doi.org/10.4319/lo.1990.35.7.1564 |
container_title |
Limnology and Oceanography |
container_volume |
35 |
container_issue |
7 |
container_start_page |
1564 |
op_container_end_page |
1576 |
_version_ |
1766271503656026112 |