Are bacteria active in the cold pelagic ecosystem of the Barents Sea?
Bacterial biomass and activity indicators have been studied at low water temperatures (?1.9 to +4°C) in Barents Sea. Strong responses by indicators of bacterial activity, such as hydrolytic enzyme and substrate uptake potentials, were observed in association with the development of phytoplankton blo...
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Norwegian Polar Institute
1991
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ftjpolarres:oai:journals.openacademia.net:article/2315 2023-05-15T15:38:23+02:00 Are bacteria active in the cold pelagic ecosystem of the Barents Sea? Thingstad, T. Frede Martinussen, Ingrid 1991-01-09 application/pdf https://polarresearch.net/index.php/polar/article/view/2315 https://doi.org/10.3402/polar.v10i1.6744 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2315/5565 https://polarresearch.net/index.php/polar/article/view/2315 doi:10.3402/polar.v10i1.6744 Copyright (c) 2018 Polar Research Polar Research; Vol. 10 No. 1: Special issue: Proceedings of the Pro Mare Symposium on Polar Marine Ecology. Part 1; 255-266 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1991 ftjpolarres https://doi.org/10.3402/polar.v10i1.6744 2021-11-11T19:12:32Z Bacterial biomass and activity indicators have been studied at low water temperatures (?1.9 to +4°C) in Barents Sea. Strong responses by indicators of bacterial activity, such as hydrolytic enzyme and substrate uptake potentials, were observed in association with the development of phytoplankton blooms. At late successional stages of blooms, observation by epifluorescence microscopy revealed heavy bacterial colonisation of detrital matter, in particular of senescent colonies of Phaeocystis pouchetii. Based on the retention of bacteria on filters of 1 ?m pore size, up to 55% of the bacterial population was estimated to be attached to organic aggregates in some cases. Based on thymidine incorporation and a conventional conversion factor, bacterial generation times as short as one day were estimated at temperatures below zero. Changes in substrate availability governed by the successional stages of the planktonic ecosystem seem to be more important as controlling factors for bacterial growth than the low temperatures of the Barents Sea. Article in Journal/Newspaper Barents Sea Polar Research Polar Research (E-Journal) Barents Sea Polar Research 10 1 255 266 |
institution |
Open Polar |
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Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
Bacterial biomass and activity indicators have been studied at low water temperatures (?1.9 to +4°C) in Barents Sea. Strong responses by indicators of bacterial activity, such as hydrolytic enzyme and substrate uptake potentials, were observed in association with the development of phytoplankton blooms. At late successional stages of blooms, observation by epifluorescence microscopy revealed heavy bacterial colonisation of detrital matter, in particular of senescent colonies of Phaeocystis pouchetii. Based on the retention of bacteria on filters of 1 ?m pore size, up to 55% of the bacterial population was estimated to be attached to organic aggregates in some cases. Based on thymidine incorporation and a conventional conversion factor, bacterial generation times as short as one day were estimated at temperatures below zero. Changes in substrate availability governed by the successional stages of the planktonic ecosystem seem to be more important as controlling factors for bacterial growth than the low temperatures of the Barents Sea. |
format |
Article in Journal/Newspaper |
author |
Thingstad, T. Frede Martinussen, Ingrid |
spellingShingle |
Thingstad, T. Frede Martinussen, Ingrid Are bacteria active in the cold pelagic ecosystem of the Barents Sea? |
author_facet |
Thingstad, T. Frede Martinussen, Ingrid |
author_sort |
Thingstad, T. Frede |
title |
Are bacteria active in the cold pelagic ecosystem of the Barents Sea? |
title_short |
Are bacteria active in the cold pelagic ecosystem of the Barents Sea? |
title_full |
Are bacteria active in the cold pelagic ecosystem of the Barents Sea? |
title_fullStr |
Are bacteria active in the cold pelagic ecosystem of the Barents Sea? |
title_full_unstemmed |
Are bacteria active in the cold pelagic ecosystem of the Barents Sea? |
title_sort |
are bacteria active in the cold pelagic ecosystem of the barents sea? |
publisher |
Norwegian Polar Institute |
publishDate |
1991 |
url |
https://polarresearch.net/index.php/polar/article/view/2315 https://doi.org/10.3402/polar.v10i1.6744 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea Polar Research |
genre_facet |
Barents Sea Polar Research |
op_source |
Polar Research; Vol. 10 No. 1: Special issue: Proceedings of the Pro Mare Symposium on Polar Marine Ecology. Part 1; 255-266 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2315/5565 https://polarresearch.net/index.php/polar/article/view/2315 doi:10.3402/polar.v10i1.6744 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v10i1.6744 |
container_title |
Polar Research |
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10 |
container_issue |
1 |
container_start_page |
255 |
op_container_end_page |
266 |
_version_ |
1766369283030384640 |