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 undersurf...
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crwiley:10.4319/lo.1990.35.7.1564 2024-06-23T07:46:34+00:00 Overwintering development, growth, and feeding of larval Euphausia superba in the Antarctic marginal ice zone Daly, Kendra L. 1990 http://dx.doi.org/10.4319/lo.1990.35.7.1564 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.1990.35.7.1564 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.1990.35.7.1564 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 35, issue 7, page 1564-1576 ISSN 0024-3590 1939-5590 journal-article 1990 crwiley https://doi.org/10.4319/lo.1990.35.7.1564 2024-06-04T06:44:23Z 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 Wiley Online Library Antarctic The Antarctic Weddell Limnology and Oceanography 35 7 1564 1576 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
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. |
spellingShingle |
Daly, Kendra L. Overwintering development, growth, and feeding of larval Euphausia superba in the Antarctic marginal ice zone |
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 |
Wiley |
publishDate |
1990 |
url |
http://dx.doi.org/10.4319/lo.1990.35.7.1564 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.1990.35.7.1564 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/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 |
Limnology and Oceanography volume 35, issue 7, page 1564-1576 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
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 |
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1802646796583829504 |