The role of the microbial loop in Antarctic pelagic ecosystems
The Paradigm pelagic food web organization in Antarctic waters is undergoing fundamental revision evidence that large fractions of material and energy flow through the microbial food web. because of the unique Antarctic ecosystem conditions, the microbial food web performs some roles that are fundam...
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Norwegian Polar Institute
1991
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ftjpolarres:oai:journals.openacademia.net:article/2313 2023-05-15T14:01:21+02:00 The role of the microbial loop in Antarctic pelagic ecosystems Azam, Farooq Smith, David C. Hollibaugh, James T. 1991-01-09 application/pdf https://polarresearch.net/index.php/polar/article/view/2313 https://doi.org/10.3402/polar.v10i1.6742 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2313/5563 https://polarresearch.net/index.php/polar/article/view/2313 doi:10.3402/polar.v10i1.6742 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; 239-244 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1991 ftjpolarres https://doi.org/10.3402/polar.v10i1.6742 2021-11-11T19:12:32Z The Paradigm pelagic food web organization in Antarctic waters is undergoing fundamental revision evidence that large fractions of material and energy flow through the microbial food web. because of the unique Antarctic ecosystem conditions, the microbial food web performs some roles that are fundamentally different from those in oligotrophic temperate and tropical waters: 1) during winter, bacterial production, at the expense of slow-turnover DOM (dissolved organic matter) from the previous summer, could be a significant factor in the survival of over wintering animal populations; 2) microbial regeneration of ammonium in nitrate-replete Antarctic waters may spare the reductants necessary for nitrate assimilation and thus enhance primary productivity of deep-mixed light-limited phytoplankton; and 3) the small diatoms and phytoflagellates which dominate the Antarctic pelagic primary production are apparently directly digestible by the metazoan herbivores, whereas cyanobacteria which dominate the primary productivity in lower latitude oligotrophic waters are not digestible by the metazoan herbivores. These roles performed by the microbial loop may, in part, explain why Antarctic waters, in contrast to the lower latitude oligotrophic waters, have high levels of tertiary productivity despite low primary productivity. Article in Journal/Newspaper Antarc* Antarctic Polar Research Polar Research (E-Journal) Antarctic The Antarctic Polar Research 10 1 239 244 |
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Open Polar |
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Polar Research (E-Journal) |
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ftjpolarres |
language |
English |
description |
The Paradigm pelagic food web organization in Antarctic waters is undergoing fundamental revision evidence that large fractions of material and energy flow through the microbial food web. because of the unique Antarctic ecosystem conditions, the microbial food web performs some roles that are fundamentally different from those in oligotrophic temperate and tropical waters: 1) during winter, bacterial production, at the expense of slow-turnover DOM (dissolved organic matter) from the previous summer, could be a significant factor in the survival of over wintering animal populations; 2) microbial regeneration of ammonium in nitrate-replete Antarctic waters may spare the reductants necessary for nitrate assimilation and thus enhance primary productivity of deep-mixed light-limited phytoplankton; and 3) the small diatoms and phytoflagellates which dominate the Antarctic pelagic primary production are apparently directly digestible by the metazoan herbivores, whereas cyanobacteria which dominate the primary productivity in lower latitude oligotrophic waters are not digestible by the metazoan herbivores. These roles performed by the microbial loop may, in part, explain why Antarctic waters, in contrast to the lower latitude oligotrophic waters, have high levels of tertiary productivity despite low primary productivity. |
format |
Article in Journal/Newspaper |
author |
Azam, Farooq Smith, David C. Hollibaugh, James T. |
spellingShingle |
Azam, Farooq Smith, David C. Hollibaugh, James T. The role of the microbial loop in Antarctic pelagic ecosystems |
author_facet |
Azam, Farooq Smith, David C. Hollibaugh, James T. |
author_sort |
Azam, Farooq |
title |
The role of the microbial loop in Antarctic pelagic ecosystems |
title_short |
The role of the microbial loop in Antarctic pelagic ecosystems |
title_full |
The role of the microbial loop in Antarctic pelagic ecosystems |
title_fullStr |
The role of the microbial loop in Antarctic pelagic ecosystems |
title_full_unstemmed |
The role of the microbial loop in Antarctic pelagic ecosystems |
title_sort |
role of the microbial loop in antarctic pelagic ecosystems |
publisher |
Norwegian Polar Institute |
publishDate |
1991 |
url |
https://polarresearch.net/index.php/polar/article/view/2313 https://doi.org/10.3402/polar.v10i1.6742 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Polar Research |
genre_facet |
Antarc* Antarctic Polar Research |
op_source |
Polar Research; Vol. 10 No. 1: Special issue: Proceedings of the Pro Mare Symposium on Polar Marine Ecology. Part 1; 239-244 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2313/5563 https://polarresearch.net/index.php/polar/article/view/2313 doi:10.3402/polar.v10i1.6742 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v10i1.6742 |
container_title |
Polar Research |
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10 |
container_issue |
1 |
container_start_page |
239 |
op_container_end_page |
244 |
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1766271082356015104 |