Different community structure and temperature optima of heterotrophic picoplankton in various regions of the Southern Ocean
The temperature control of the growth of heterotrophic picoplankton was studied in the Southern Ocean along a transect between the Polar Front (49 degrees S) and the shelf ice edge at 70 degrees S in the austral summer. Growth was measured by thymidine and leucine incorporation applying the dual-lab...
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ftpubman:oai:pure.mpg.de:item_3154151 2023-08-27T04:04:09+02:00 Different community structure and temperature optima of heterotrophic picoplankton in various regions of the Southern Ocean Simon, M. Glöckner, F. Amann, R. 1999 application/pdf http://hdl.handle.net/21.11116/0000-0004-C378-9 http://hdl.handle.net/21.11116/0000-0004-C37A-7 eng eng info:eu-repo/semantics/altIdentifier/doi/10.3354/ame018275 http://hdl.handle.net/21.11116/0000-0004-C378-9 http://hdl.handle.net/21.11116/0000-0004-C37A-7 Aquatic Microbial Ecology info:eu-repo/semantics/article 1999 ftpubman https://doi.org/10.3354/ame018275 2023-08-02T00:05:40Z The temperature control of the growth of heterotrophic picoplankton was studied in the Southern Ocean along a transect between the Polar Front (49 degrees S) and the shelf ice edge at 70 degrees S in the austral summer. Growth was measured by thymidine and leucine incorporation applying the dual-label approach. Psychrotolerant or mesophilic communities with a growth optimum of >18 degrees C were present in surface waters at the Polar Front at an in situ temperature of 4 to 5 degrees C. Further south in surface waters of the Antarctic circumpolar current (ACC), in the marginal ice zone and at the shelf ice edge, psychrophilic communities with growth optima of 11 and 4 to 8 degrees C, respectively, were present. Growth at the ambient temperature of ca 0 degrees C or slightly below was reduced. By in situ hybridization with fluorescent rRNA-targeted oligonucleotide probes, between 63 and 96% of all DAPI-stainable picoplankton cells were identified as Bacteria whereas Archaea were never detected. Cells belonging to the Cytophaga/Flavobacterium cluster were most abundant from all bacterial groups tested (alpha-, beta-, and gamma-subclass of Proteobacteria, Cytophaga/Flavobacterium cluster) and comprised 20 % of DAPI counts at the Polar Front and 40 % in the ACC. In the marginal ice zone during a bloom of Phaeocystis sp. they even comprised 72%. gamma-subclass proteobacteria accounted for <1% of DAPI counts at the Polar Front and for 7 to 9% further south. alpha-subclass proteobacteria never exceeded 1% and beta-subclass proteobacteria were not detected at all. The results indicate that different communities of heterotrophic picoplankton established along the transect from the Polar Front south to the marginal ice zone as shown by the reduction of the temperature optima and coinciding with a change in the community structure and a pronounced dominance of bacteria of the Cytophaga/Flavobacterium cluster in the psychrophilic communities. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Max Planck Society: MPG.PuRe Antarctic Austral Southern Ocean The Antarctic Aquatic Microbial Ecology 18 275 284 |
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Open Polar |
collection |
Max Planck Society: MPG.PuRe |
op_collection_id |
ftpubman |
language |
English |
description |
The temperature control of the growth of heterotrophic picoplankton was studied in the Southern Ocean along a transect between the Polar Front (49 degrees S) and the shelf ice edge at 70 degrees S in the austral summer. Growth was measured by thymidine and leucine incorporation applying the dual-label approach. Psychrotolerant or mesophilic communities with a growth optimum of >18 degrees C were present in surface waters at the Polar Front at an in situ temperature of 4 to 5 degrees C. Further south in surface waters of the Antarctic circumpolar current (ACC), in the marginal ice zone and at the shelf ice edge, psychrophilic communities with growth optima of 11 and 4 to 8 degrees C, respectively, were present. Growth at the ambient temperature of ca 0 degrees C or slightly below was reduced. By in situ hybridization with fluorescent rRNA-targeted oligonucleotide probes, between 63 and 96% of all DAPI-stainable picoplankton cells were identified as Bacteria whereas Archaea were never detected. Cells belonging to the Cytophaga/Flavobacterium cluster were most abundant from all bacterial groups tested (alpha-, beta-, and gamma-subclass of Proteobacteria, Cytophaga/Flavobacterium cluster) and comprised 20 % of DAPI counts at the Polar Front and 40 % in the ACC. In the marginal ice zone during a bloom of Phaeocystis sp. they even comprised 72%. gamma-subclass proteobacteria accounted for <1% of DAPI counts at the Polar Front and for 7 to 9% further south. alpha-subclass proteobacteria never exceeded 1% and beta-subclass proteobacteria were not detected at all. The results indicate that different communities of heterotrophic picoplankton established along the transect from the Polar Front south to the marginal ice zone as shown by the reduction of the temperature optima and coinciding with a change in the community structure and a pronounced dominance of bacteria of the Cytophaga/Flavobacterium cluster in the psychrophilic communities. |
format |
Article in Journal/Newspaper |
author |
Simon, M. Glöckner, F. Amann, R. |
spellingShingle |
Simon, M. Glöckner, F. Amann, R. Different community structure and temperature optima of heterotrophic picoplankton in various regions of the Southern Ocean |
author_facet |
Simon, M. Glöckner, F. Amann, R. |
author_sort |
Simon, M. |
title |
Different community structure and temperature optima of heterotrophic picoplankton in various regions of the Southern Ocean |
title_short |
Different community structure and temperature optima of heterotrophic picoplankton in various regions of the Southern Ocean |
title_full |
Different community structure and temperature optima of heterotrophic picoplankton in various regions of the Southern Ocean |
title_fullStr |
Different community structure and temperature optima of heterotrophic picoplankton in various regions of the Southern Ocean |
title_full_unstemmed |
Different community structure and temperature optima of heterotrophic picoplankton in various regions of the Southern Ocean |
title_sort |
different community structure and temperature optima of heterotrophic picoplankton in various regions of the southern ocean |
publishDate |
1999 |
url |
http://hdl.handle.net/21.11116/0000-0004-C378-9 http://hdl.handle.net/21.11116/0000-0004-C37A-7 |
geographic |
Antarctic Austral Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Aquatic Microbial Ecology |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/ame018275 http://hdl.handle.net/21.11116/0000-0004-C378-9 http://hdl.handle.net/21.11116/0000-0004-C37A-7 |
op_doi |
https://doi.org/10.3354/ame018275 |
container_title |
Aquatic Microbial Ecology |
container_volume |
18 |
container_start_page |
275 |
op_container_end_page |
284 |
_version_ |
1775349709982924800 |