Bacterial Standing Stock, Activity, and Carbon Production during Formation and Growth of Sea Ice in the Weddell Sea, Antarctica †
Bacterial response to formation and growth of sea ice was investigated during autumn in the northeastern Weddell Sea. Changes in standing stock, activity, and carbon production of bacteria were determined in successive stages of ice development. During initial ice formation, concentrations of bacter...
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ftpubmed:oai:pubmedcentral.nih.gov:201718 2023-05-15T13:52:27+02:00 Bacterial Standing Stock, Activity, and Carbon Production during Formation and Growth of Sea Ice in the Weddell Sea, Antarctica † Grossmann, Sönnke Dieckmann, Gerhard S. 1994-08 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC201718 http://www.ncbi.nlm.nih.gov/pubmed/16349347 en eng http://www.ncbi.nlm.nih.gov/pmc/articles/PMC201718 http://www.ncbi.nlm.nih.gov/pubmed/16349347 Copyright © 1994, American Society for Microbiology General Microbial Ecology Text 1994 ftpubmed 2013-08-29T14:12:05Z Bacterial response to formation and growth of sea ice was investigated during autumn in the northeastern Weddell Sea. Changes in standing stock, activity, and carbon production of bacteria were determined in successive stages of ice development. During initial ice formation, concentrations of bacterial cells, in the order of 1 × 108 to 3 × 108 liter-1, were not enhanced within the ice matrix. This suggests that physical enrichment of bacteria by ice crystals is not effective. Due to low concentrations of phytoplankton in the water column during freezing, incorporation of bacteria into newly formed ice via attachment to algal cells or aggregates was not recorded in this study. As soon as the ice had formed, the general metabolic activity of bacterial populations was strongly suppressed. Furthermore, the ratio of [3H]leucine incorporation into proteins to [3H]thymidine incorporation into DNA changed during ice growth. In thick pack ice, bacterial activity recovered and growth rates up to 0.6 day-1 indicated actively dividing populations. However, biomass-specific utilization of organic compounds remained lower than in open water. Bacterial concentrations of up to 2.8 × 109 cells liter-1 along with considerably enlarged cell volumes accumulated within thick pack ice, suggesting reduced mortality rates of bacteria within the small brine pores. In the course of ice development, bacterial carbon production increased from about 0.01 to 0.4 μg of C liter-1 h-1. In thick ice, bacterial secondary production exceeded primary production of microalgae. Text Antarc* Antarctica Sea ice Weddell Sea PubMed Central (PMC) Weddell Weddell Sea |
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English |
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General Microbial Ecology |
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General Microbial Ecology Grossmann, Sönnke Dieckmann, Gerhard S. Bacterial Standing Stock, Activity, and Carbon Production during Formation and Growth of Sea Ice in the Weddell Sea, Antarctica † |
topic_facet |
General Microbial Ecology |
description |
Bacterial response to formation and growth of sea ice was investigated during autumn in the northeastern Weddell Sea. Changes in standing stock, activity, and carbon production of bacteria were determined in successive stages of ice development. During initial ice formation, concentrations of bacterial cells, in the order of 1 × 108 to 3 × 108 liter-1, were not enhanced within the ice matrix. This suggests that physical enrichment of bacteria by ice crystals is not effective. Due to low concentrations of phytoplankton in the water column during freezing, incorporation of bacteria into newly formed ice via attachment to algal cells or aggregates was not recorded in this study. As soon as the ice had formed, the general metabolic activity of bacterial populations was strongly suppressed. Furthermore, the ratio of [3H]leucine incorporation into proteins to [3H]thymidine incorporation into DNA changed during ice growth. In thick pack ice, bacterial activity recovered and growth rates up to 0.6 day-1 indicated actively dividing populations. However, biomass-specific utilization of organic compounds remained lower than in open water. Bacterial concentrations of up to 2.8 × 109 cells liter-1 along with considerably enlarged cell volumes accumulated within thick pack ice, suggesting reduced mortality rates of bacteria within the small brine pores. In the course of ice development, bacterial carbon production increased from about 0.01 to 0.4 μg of C liter-1 h-1. In thick ice, bacterial secondary production exceeded primary production of microalgae. |
format |
Text |
author |
Grossmann, Sönnke Dieckmann, Gerhard S. |
author_facet |
Grossmann, Sönnke Dieckmann, Gerhard S. |
author_sort |
Grossmann, Sönnke |
title |
Bacterial Standing Stock, Activity, and Carbon Production during Formation and Growth of Sea Ice in the Weddell Sea, Antarctica † |
title_short |
Bacterial Standing Stock, Activity, and Carbon Production during Formation and Growth of Sea Ice in the Weddell Sea, Antarctica † |
title_full |
Bacterial Standing Stock, Activity, and Carbon Production during Formation and Growth of Sea Ice in the Weddell Sea, Antarctica † |
title_fullStr |
Bacterial Standing Stock, Activity, and Carbon Production during Formation and Growth of Sea Ice in the Weddell Sea, Antarctica † |
title_full_unstemmed |
Bacterial Standing Stock, Activity, and Carbon Production during Formation and Growth of Sea Ice in the Weddell Sea, Antarctica † |
title_sort |
bacterial standing stock, activity, and carbon production during formation and growth of sea ice in the weddell sea, antarctica † |
publishDate |
1994 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC201718 http://www.ncbi.nlm.nih.gov/pubmed/16349347 |
geographic |
Weddell Weddell Sea |
geographic_facet |
Weddell Weddell Sea |
genre |
Antarc* Antarctica Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctica Sea ice Weddell Sea |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC201718 http://www.ncbi.nlm.nih.gov/pubmed/16349347 |
op_rights |
Copyright © 1994, American Society for Microbiology |
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1766256736945045504 |