Ecology of diatom and bacterial assemblages in water associated with melting summer sea ice in the Weddell Sea, Antarctica
The fate of ice biota released via meltwater into pools of seawater trapped between melting ice floes (crack pools) was followed in late January in the southern Weddell Sea. Low salinity crack pools shared the following features: nitrate exhaustion, high pH and POC/PON ratios, high bacterial biomass...
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Cambridge University Press (CUP)
1996
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Online Access: | http://dx.doi.org/10.1017/s095410209600020x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410209600020X |
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crcambridgeupr:10.1017/s095410209600020x 2024-05-19T07:29:59+00:00 Ecology of diatom and bacterial assemblages in water associated with melting summer sea ice in the Weddell Sea, Antarctica Gleitz, Markus Grossmann, Sönnke Scharekm, Renate Smetacek, Victor 1996 http://dx.doi.org/10.1017/s095410209600020x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410209600020X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 8, issue 2, page 135-146 ISSN 0954-1020 1365-2079 journal-article 1996 crcambridgeupr https://doi.org/10.1017/s095410209600020x 2024-05-02T06:51:21Z The fate of ice biota released via meltwater into pools of seawater trapped between melting ice floes (crack pools) was followed in late January in the southern Weddell Sea. Low salinity crack pools shared the following features: nitrate exhaustion, high pH and POC/PON ratios, high bacterial biomass composed of large cells, and a dense algal assemblage dominated to over 90% by only two diatom species. It is suggested that this “climax stage” evolved from a nutrient rich, moderate biomass situation prevailing in high salinity crack pools, and is representative of summer succession of sea ice biota. “Overflow” production following nitrate exhaustion by the algae resulted in internal (lipid) and external (presumably mucus) carbon pools. The latter must fuel bacterial biomass build-up, as algal mortality appeared to be low. The large algal and bacterial stocks point to low grazing pressure exerted by phagotrophic protists, presumably due to poor food quality (e.g. high C/N ratios) and/or excessive mucus production. It is concluded that environmental selection of the abundant ice algal species occurs under conditions prevailing in the disintegrating ice cover during summer, which differ drastically from those generally referred to as characteristic of the sea ice habitat at large (a combination of low temperature, low light and high salinity). Article in Journal/Newspaper Antarc* Antarctic Science Antarctica Sea ice Weddell Sea Cambridge University Press Antarctic Science 8 2 135 146 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
The fate of ice biota released via meltwater into pools of seawater trapped between melting ice floes (crack pools) was followed in late January in the southern Weddell Sea. Low salinity crack pools shared the following features: nitrate exhaustion, high pH and POC/PON ratios, high bacterial biomass composed of large cells, and a dense algal assemblage dominated to over 90% by only two diatom species. It is suggested that this “climax stage” evolved from a nutrient rich, moderate biomass situation prevailing in high salinity crack pools, and is representative of summer succession of sea ice biota. “Overflow” production following nitrate exhaustion by the algae resulted in internal (lipid) and external (presumably mucus) carbon pools. The latter must fuel bacterial biomass build-up, as algal mortality appeared to be low. The large algal and bacterial stocks point to low grazing pressure exerted by phagotrophic protists, presumably due to poor food quality (e.g. high C/N ratios) and/or excessive mucus production. It is concluded that environmental selection of the abundant ice algal species occurs under conditions prevailing in the disintegrating ice cover during summer, which differ drastically from those generally referred to as characteristic of the sea ice habitat at large (a combination of low temperature, low light and high salinity). |
format |
Article in Journal/Newspaper |
author |
Gleitz, Markus Grossmann, Sönnke Scharekm, Renate Smetacek, Victor |
spellingShingle |
Gleitz, Markus Grossmann, Sönnke Scharekm, Renate Smetacek, Victor Ecology of diatom and bacterial assemblages in water associated with melting summer sea ice in the Weddell Sea, Antarctica |
author_facet |
Gleitz, Markus Grossmann, Sönnke Scharekm, Renate Smetacek, Victor |
author_sort |
Gleitz, Markus |
title |
Ecology of diatom and bacterial assemblages in water associated with melting summer sea ice in the Weddell Sea, Antarctica |
title_short |
Ecology of diatom and bacterial assemblages in water associated with melting summer sea ice in the Weddell Sea, Antarctica |
title_full |
Ecology of diatom and bacterial assemblages in water associated with melting summer sea ice in the Weddell Sea, Antarctica |
title_fullStr |
Ecology of diatom and bacterial assemblages in water associated with melting summer sea ice in the Weddell Sea, Antarctica |
title_full_unstemmed |
Ecology of diatom and bacterial assemblages in water associated with melting summer sea ice in the Weddell Sea, Antarctica |
title_sort |
ecology of diatom and bacterial assemblages in water associated with melting summer sea ice in the weddell sea, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1996 |
url |
http://dx.doi.org/10.1017/s095410209600020x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410209600020X |
genre |
Antarc* Antarctic Science Antarctica Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Science Antarctica Sea ice Weddell Sea |
op_source |
Antarctic Science volume 8, issue 2, page 135-146 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s095410209600020x |
container_title |
Antarctic Science |
container_volume |
8 |
container_issue |
2 |
container_start_page |
135 |
op_container_end_page |
146 |
_version_ |
1799482904206639104 |