Summer community respiration and pelagic metabolism in upper surface Antarctic waters
Microplanktonic community respiration (R) and net community production (NCP) in upper surface waters around the Antarctic Peninsula were studied in the summers of 1993, 1994 and 2000. Data on pelagic community metabolism from upper surface Antarctic waters (N = 27) were collected from the literature...
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ftcsic:oai:digital.csic.es:10261/86903 2024-02-11T09:56:14+01:00 Summer community respiration and pelagic metabolism in upper surface Antarctic waters Agustí, Susana Satta, Maria Paola Mura, Maria Paola 2004 http://hdl.handle.net/10261/86903 en eng Inter Research issn: 0948-3055 Aquatic Microbial Ecology 35(2): 197-205 (2004) http://hdl.handle.net/10261/86903 open artículo http://purl.org/coar/resource_type/c_6501 2004 ftcsic 2024-01-16T09:54:14Z Microplanktonic community respiration (R) and net community production (NCP) in upper surface waters around the Antarctic Peninsula were studied in the summers of 1993, 1994 and 2000. Data on pelagic community metabolism from upper surface Antarctic waters (N = 27) were collected from the literature and included in the analysis (N = 96). The variability of phytoplankton chl a concentration found was high, ranging from 0.06 to 16.75 mg m-3 d-1. R rates varied from 0.19 to 11.03 mmol O2 m -3 d-1 and were not related to chl a concentration. The variability in daily NCP rates was higher than that found for R, ranging from -6.29 to 35.4 mmol O2 m-3 d-1, and was positively related to chl a concentration (R2 = 0.46). NCP rates were often negative (53 % of the observations) in the 1993 survey, indicative of community respiration in excess of primary production. Negative NCP was less frequent during the 1994 and 2000 cruises and in the literature data (18, 7 and 4 % of the observations, respectively). A positive and strong relationship (R2 = 0.92) was observed between NCP and gross primary production (GPP), whereas R was independent of GPP. The relationships found imply that changes in GPP play a dominant role in the control of net planktonic metabolism in Antarctic waters, allowing excess carbon to be fixed by phytoplankton during phytoplankton blooms. In contrast, unproductive Antarctic communities (<0.064 g O2 m-3 d-1) tend to be net heterotrophic, thereby representing CO2 sources, rather than sinks. Since phytoplankton-poor waters extend over most of the Southern Ocean, these results stress the need to evaluate their role in oceanic carbon flow on the basis of a more comprehensive temporal and spatial data set. Peer Reviewed Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Southern Ocean Digital.CSIC (Spanish National Research Council) Antarctic Antarctic Peninsula Southern Ocean The Antarctic |
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Open Polar |
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Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
description |
Microplanktonic community respiration (R) and net community production (NCP) in upper surface waters around the Antarctic Peninsula were studied in the summers of 1993, 1994 and 2000. Data on pelagic community metabolism from upper surface Antarctic waters (N = 27) were collected from the literature and included in the analysis (N = 96). The variability of phytoplankton chl a concentration found was high, ranging from 0.06 to 16.75 mg m-3 d-1. R rates varied from 0.19 to 11.03 mmol O2 m -3 d-1 and were not related to chl a concentration. The variability in daily NCP rates was higher than that found for R, ranging from -6.29 to 35.4 mmol O2 m-3 d-1, and was positively related to chl a concentration (R2 = 0.46). NCP rates were often negative (53 % of the observations) in the 1993 survey, indicative of community respiration in excess of primary production. Negative NCP was less frequent during the 1994 and 2000 cruises and in the literature data (18, 7 and 4 % of the observations, respectively). A positive and strong relationship (R2 = 0.92) was observed between NCP and gross primary production (GPP), whereas R was independent of GPP. The relationships found imply that changes in GPP play a dominant role in the control of net planktonic metabolism in Antarctic waters, allowing excess carbon to be fixed by phytoplankton during phytoplankton blooms. In contrast, unproductive Antarctic communities (<0.064 g O2 m-3 d-1) tend to be net heterotrophic, thereby representing CO2 sources, rather than sinks. Since phytoplankton-poor waters extend over most of the Southern Ocean, these results stress the need to evaluate their role in oceanic carbon flow on the basis of a more comprehensive temporal and spatial data set. Peer Reviewed |
format |
Article in Journal/Newspaper |
author |
Agustí, Susana Satta, Maria Paola Mura, Maria Paola |
spellingShingle |
Agustí, Susana Satta, Maria Paola Mura, Maria Paola Summer community respiration and pelagic metabolism in upper surface Antarctic waters |
author_facet |
Agustí, Susana Satta, Maria Paola Mura, Maria Paola |
author_sort |
Agustí, Susana |
title |
Summer community respiration and pelagic metabolism in upper surface Antarctic waters |
title_short |
Summer community respiration and pelagic metabolism in upper surface Antarctic waters |
title_full |
Summer community respiration and pelagic metabolism in upper surface Antarctic waters |
title_fullStr |
Summer community respiration and pelagic metabolism in upper surface Antarctic waters |
title_full_unstemmed |
Summer community respiration and pelagic metabolism in upper surface Antarctic waters |
title_sort |
summer community respiration and pelagic metabolism in upper surface antarctic waters |
publisher |
Inter Research |
publishDate |
2004 |
url |
http://hdl.handle.net/10261/86903 |
geographic |
Antarctic Antarctic Peninsula Southern Ocean The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
op_relation |
issn: 0948-3055 Aquatic Microbial Ecology 35(2): 197-205 (2004) http://hdl.handle.net/10261/86903 |
op_rights |
open |
_version_ |
1790601568976896000 |