Dissolved and particulate primary production and bacterial production in offshore Antarctic waters during austral summer: coupled or uncoupled?
15 pages, 8 figures, 5 tables The dependence of heterotrophic bacteria on dissolved organic products released by phytoplankton was estimated in the Weddell and Scotia Seas during austral summer 1998. We used time-course experiments of 14C-bicarbonate assimilation and compartmental analysis to estima...
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Online Access: | http://hdl.handle.net/10261/173701 https://doi.org/10.3354/meps222025 |
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ftcsic:oai:digital.csic.es:10261/173701 2024-02-11T09:57:03+01:00 Dissolved and particulate primary production and bacterial production in offshore Antarctic waters during austral summer: coupled or uncoupled? Morán, Xosé Anxelu G. Gasol, Josep M. Pedrós-Alió, Carlos Estrada, Marta Ministerio de Educación y Cultura (España) 2001 http://hdl.handle.net/10261/173701 https://doi.org/10.3354/meps222025 unknown Inter Research Publisher's version https://doi.org/10.3354/meps222025 Sí doi:10.3354/meps222025 issn: 0171-8630 e-issn: 1616-1599 Marine Ecology Progress Series 222: 25-39 (2001) http://hdl.handle.net/10261/173701 open Coupling DOC Phytoplankton Southern Ocean Bacterial production Primary production Bacteria artículo http://purl.org/coar/resource_type/c_6501 2001 ftcsic https://doi.org/10.3354/meps222025 2024-01-16T10:34:47Z 15 pages, 8 figures, 5 tables The dependence of heterotrophic bacteria on dissolved organic products released by phytoplankton was estimated in the Weddell and Scotia Seas during austral summer 1998. We used time-course experiments of 14C-bicarbonate assimilation and compartmental analysis to estimate primary production of total (TOC), particulate (POC) and dissolved (DOC) organic carbon. Three in situ incubations were also performed in Bransfield Strait. Phytoplanktonic biomass and production were within the ranges previously reported for offshore Antarctic waters, with mean values of 0.45 mgchlorophylla m-3 and 0.51 mgC m-3 h-1 for total primary production (0.45 and 0.06 mgC m-3 h-1 of POC and DOC, respectively). Percent extracellular release (PER = DOC/[POC+DOC]) averaged 13% (range 5 to 33%), a value comparable with those reported for lower latitudes. The production rate of DOC correlated positively with TOC and POC production rates, but not with chlorophyll a concentration, suggesting that availability of recently fixed photosynthate was a key factor regulating phytoplanktonic DOC release. As much as 82% of the variance in bacterial heterotrophic production (BHP), estimated by 3H-leucine incorporation, was accounted for by dissolved primary production. BHP bore no relationship with other phytoplankton-related variables. Assuming a conservative bacterial growth efficiency of 14%, as reported by recent work in Antarctic waters, our experiments indicate that phytoplanktonically produced DOC would suffice to meet bacterial carbon demand. These results suggest a strong coupling between phytoplankton and bacterioplankton through DOC release and uptake under non-bloom conditions in the Southern Ocean This work was supported by a Spanish CICYT grant (ANT96-0866) to Marc A. García. X.A.G.M. acknowledges the receipt of a FPI pre-doctoral fellowship from the Spanish Ministry of Education and Culture Peer Reviewed Article in Journal/Newspaper Antarc* Antarctic Bransfield Strait Southern Ocean Digital.CSIC (Spanish National Research Council) Antarctic Southern Ocean Austral Bransfield Strait Weddell Marine Ecology Progress Series 222 25 39 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Coupling DOC Phytoplankton Southern Ocean Bacterial production Primary production Bacteria |
spellingShingle |
Coupling DOC Phytoplankton Southern Ocean Bacterial production Primary production Bacteria Morán, Xosé Anxelu G. Gasol, Josep M. Pedrós-Alió, Carlos Estrada, Marta Dissolved and particulate primary production and bacterial production in offshore Antarctic waters during austral summer: coupled or uncoupled? |
topic_facet |
Coupling DOC Phytoplankton Southern Ocean Bacterial production Primary production Bacteria |
description |
15 pages, 8 figures, 5 tables The dependence of heterotrophic bacteria on dissolved organic products released by phytoplankton was estimated in the Weddell and Scotia Seas during austral summer 1998. We used time-course experiments of 14C-bicarbonate assimilation and compartmental analysis to estimate primary production of total (TOC), particulate (POC) and dissolved (DOC) organic carbon. Three in situ incubations were also performed in Bransfield Strait. Phytoplanktonic biomass and production were within the ranges previously reported for offshore Antarctic waters, with mean values of 0.45 mgchlorophylla m-3 and 0.51 mgC m-3 h-1 for total primary production (0.45 and 0.06 mgC m-3 h-1 of POC and DOC, respectively). Percent extracellular release (PER = DOC/[POC+DOC]) averaged 13% (range 5 to 33%), a value comparable with those reported for lower latitudes. The production rate of DOC correlated positively with TOC and POC production rates, but not with chlorophyll a concentration, suggesting that availability of recently fixed photosynthate was a key factor regulating phytoplanktonic DOC release. As much as 82% of the variance in bacterial heterotrophic production (BHP), estimated by 3H-leucine incorporation, was accounted for by dissolved primary production. BHP bore no relationship with other phytoplankton-related variables. Assuming a conservative bacterial growth efficiency of 14%, as reported by recent work in Antarctic waters, our experiments indicate that phytoplanktonically produced DOC would suffice to meet bacterial carbon demand. These results suggest a strong coupling between phytoplankton and bacterioplankton through DOC release and uptake under non-bloom conditions in the Southern Ocean This work was supported by a Spanish CICYT grant (ANT96-0866) to Marc A. García. X.A.G.M. acknowledges the receipt of a FPI pre-doctoral fellowship from the Spanish Ministry of Education and Culture Peer Reviewed |
author2 |
Ministerio de Educación y Cultura (España) |
format |
Article in Journal/Newspaper |
author |
Morán, Xosé Anxelu G. Gasol, Josep M. Pedrós-Alió, Carlos Estrada, Marta |
author_facet |
Morán, Xosé Anxelu G. Gasol, Josep M. Pedrós-Alió, Carlos Estrada, Marta |
author_sort |
Morán, Xosé Anxelu G. |
title |
Dissolved and particulate primary production and bacterial production in offshore Antarctic waters during austral summer: coupled or uncoupled? |
title_short |
Dissolved and particulate primary production and bacterial production in offshore Antarctic waters during austral summer: coupled or uncoupled? |
title_full |
Dissolved and particulate primary production and bacterial production in offshore Antarctic waters during austral summer: coupled or uncoupled? |
title_fullStr |
Dissolved and particulate primary production and bacterial production in offshore Antarctic waters during austral summer: coupled or uncoupled? |
title_full_unstemmed |
Dissolved and particulate primary production and bacterial production in offshore Antarctic waters during austral summer: coupled or uncoupled? |
title_sort |
dissolved and particulate primary production and bacterial production in offshore antarctic waters during austral summer: coupled or uncoupled? |
publisher |
Inter Research |
publishDate |
2001 |
url |
http://hdl.handle.net/10261/173701 https://doi.org/10.3354/meps222025 |
geographic |
Antarctic Southern Ocean Austral Bransfield Strait Weddell |
geographic_facet |
Antarctic Southern Ocean Austral Bransfield Strait Weddell |
genre |
Antarc* Antarctic Bransfield Strait Southern Ocean |
genre_facet |
Antarc* Antarctic Bransfield Strait Southern Ocean |
op_relation |
Publisher's version https://doi.org/10.3354/meps222025 Sí doi:10.3354/meps222025 issn: 0171-8630 e-issn: 1616-1599 Marine Ecology Progress Series 222: 25-39 (2001) http://hdl.handle.net/10261/173701 |
op_rights |
open |
op_doi |
https://doi.org/10.3354/meps222025 |
container_title |
Marine Ecology Progress Series |
container_volume |
222 |
container_start_page |
25 |
op_container_end_page |
39 |
_version_ |
1790608064895778816 |