Seasonal development of algal biomass in snow-covered fast ice and the underlying platelet layer in the Weddell Sea, Antarctica
The seasonal changes of the nutrient regime and the development of algal communities in snow-covered fast ice and the underlying platelet layer was investigated in the eastern Weddell Sea during autumn, winter, and spring 1995. In the upper sea ice, an autumnal diatom community became enclosed durin...
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1999
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Online Access: | http://dx.doi.org/10.1017/s0954102099000395 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102099000395 |
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crcambridgeupr:10.1017/s0954102099000395 2024-04-21T07:51:53+00:00 Seasonal development of algal biomass in snow-covered fast ice and the underlying platelet layer in the Weddell Sea, Antarctica Günther, Sven Dieckmann, Gerhard S. 1999 http://dx.doi.org/10.1017/s0954102099000395 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102099000395 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 11, issue 3, page 305-315 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 1999 crcambridgeupr https://doi.org/10.1017/s0954102099000395 2024-04-02T06:53:46Z The seasonal changes of the nutrient regime and the development of algal communities in snow-covered fast ice and the underlying platelet layer was investigated in the eastern Weddell Sea during autumn, winter, and spring 1995. In the upper sea ice, an autumnal diatom community became enclosed during subsequent ice growth in winter, declined, and was replaced by a flagellate dominated community in spring. In this layer, nitrate was completely exhausted at the end of spring, although nutrients had been partly regenerated in early spring. The progressive congelation of platelet ice contributed significantly to sea ice growth thus influencing algal inoculation of the sea ice bottom. Biomass, present in the uppermost section of the platelet layer, could be found in the sea ice bottom after this section congealed to solid ice. After incorporation, species composition changed from larger and chain-forming species to species of smaller cell size. Concurrently, net growth rate slowed down from 0.07 day −1 within the platelet layer to 0.03 day −1 within the sea ice. Despite a thick snow cover of more than 20 cm, maximum biomass yield was 210 mg chl a m −2 in the platelet layer and 40 mg chl a m −2 in the sea ice respectively, while 95% of the latter was located within consolidated platelet ice. Total fast ice biomass observed here is significantly lower than that observed in snow-free fast ice of the Ross Sea, but because snow cover of the southern Weddell Sea is representative of most fast ice areas in the Antarctic, the data presented here are of general value. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Antarctica Ross Sea Sea ice Weddell Sea Cambridge University Press Antarctic Science 11 3 305 315 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Günther, Sven Dieckmann, Gerhard S. Seasonal development of algal biomass in snow-covered fast ice and the underlying platelet layer in the Weddell Sea, Antarctica |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
The seasonal changes of the nutrient regime and the development of algal communities in snow-covered fast ice and the underlying platelet layer was investigated in the eastern Weddell Sea during autumn, winter, and spring 1995. In the upper sea ice, an autumnal diatom community became enclosed during subsequent ice growth in winter, declined, and was replaced by a flagellate dominated community in spring. In this layer, nitrate was completely exhausted at the end of spring, although nutrients had been partly regenerated in early spring. The progressive congelation of platelet ice contributed significantly to sea ice growth thus influencing algal inoculation of the sea ice bottom. Biomass, present in the uppermost section of the platelet layer, could be found in the sea ice bottom after this section congealed to solid ice. After incorporation, species composition changed from larger and chain-forming species to species of smaller cell size. Concurrently, net growth rate slowed down from 0.07 day −1 within the platelet layer to 0.03 day −1 within the sea ice. Despite a thick snow cover of more than 20 cm, maximum biomass yield was 210 mg chl a m −2 in the platelet layer and 40 mg chl a m −2 in the sea ice respectively, while 95% of the latter was located within consolidated platelet ice. Total fast ice biomass observed here is significantly lower than that observed in snow-free fast ice of the Ross Sea, but because snow cover of the southern Weddell Sea is representative of most fast ice areas in the Antarctic, the data presented here are of general value. |
format |
Article in Journal/Newspaper |
author |
Günther, Sven Dieckmann, Gerhard S. |
author_facet |
Günther, Sven Dieckmann, Gerhard S. |
author_sort |
Günther, Sven |
title |
Seasonal development of algal biomass in snow-covered fast ice and the underlying platelet layer in the Weddell Sea, Antarctica |
title_short |
Seasonal development of algal biomass in snow-covered fast ice and the underlying platelet layer in the Weddell Sea, Antarctica |
title_full |
Seasonal development of algal biomass in snow-covered fast ice and the underlying platelet layer in the Weddell Sea, Antarctica |
title_fullStr |
Seasonal development of algal biomass in snow-covered fast ice and the underlying platelet layer in the Weddell Sea, Antarctica |
title_full_unstemmed |
Seasonal development of algal biomass in snow-covered fast ice and the underlying platelet layer in the Weddell Sea, Antarctica |
title_sort |
seasonal development of algal biomass in snow-covered fast ice and the underlying platelet layer in the weddell sea, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1999 |
url |
http://dx.doi.org/10.1017/s0954102099000395 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102099000395 |
genre |
Antarc* Antarctic Antarctic Science Antarctica Ross Sea Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Science Antarctica Ross Sea Sea ice Weddell Sea |
op_source |
Antarctic Science volume 11, issue 3, page 305-315 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102099000395 |
container_title |
Antarctic Science |
container_volume |
11 |
container_issue |
3 |
container_start_page |
305 |
op_container_end_page |
315 |
_version_ |
1796935166106533888 |