Trophic control of biogenic carbon export in Bransfield and Gerlache Straits, Antarctica
Size-fractionated chlorophyll a and photosynthetic carbon incorporation, microbial oxygen production and respiration and particulate vertical flux were measured in January 1996 at three regions, characterized by distinct hydrographic fields and planktonic communities, of the Antarctic Peninsula: (1)...
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2001
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fthighwire:oai:open-archive.highwire.org:plankt:23/12/1345 2023-05-15T13:50:28+02:00 Trophic control of biogenic carbon export in Bransfield and Gerlache Straits, Antarctica Serret, Pablo Fernández, Emilio Anadón, Ricardo Varela, Manuel 2001-12-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/23/12/1345 https://doi.org/10.1093/plankt/23.12.1345 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/23/12/1345 http://dx.doi.org/10.1093/plankt/23.12.1345 Copyright (C) 2001, Oxford University Press ORIGINAL ARTICLES TEXT 2001 fthighwire https://doi.org/10.1093/plankt/23.12.1345 2007-06-23T19:39:48Z Size-fractionated chlorophyll a and photosynthetic carbon incorporation, microbial oxygen production and respiration and particulate vertical flux were measured in January 1996 at three regions, characterized by distinct hydrographic fields and planktonic communities, of the Antarctic Peninsula: (1) a diatom-Phaeocystis sp., dominated community associated with the relatively stratified waters of the Gerlache Strait, (2) a nanoplankton-Cryptomonas sp. dominated assemblage at the Gerlache–Bransfield confluence; and (3) a nano- and picoplankton community in mixed waters of the Bransfield Strait. Despite the marked differences in both community structure and total phytoplankton biomass and primary production, and against predictions from models about trophic control of C export, the lowest respiration rates were measured at Bransfield (pico- and nanoplankton), and no difference was observed between the Gerlache (large diatoms) and Bransfield stations in relative vertical particle flux (6.4 vs. 5.1 % of suspended C; 14.9 vs. 10.4 % of net community production, respectively). Growth and loss rates of the phytoplankton population studied for each community indicate that microbial populations can be explained by in situ growth, but spatial (diatom-Phaeocystis sp., bloom) and temporal (diatom-Phaeocystis sp. bloom and nanoplankton communities) scales of study were shown to be insufficient for addressing the coupling between primary production and biogenic carbon export, especially after the appreciation of the accumulation of dissolved organic carbon in the water column. This would explain the unexpected results and highlights the necessity of including the mechanisms controlling accumulation and consumption of dissolved organic matter into conceptual models about the trophic control of C export. Text Antarc* Antarctic Antarctic Peninsula Antarctica Bransfield Strait HighWire Press (Stanford University) Antarctic The Antarctic Antarctic Peninsula Bransfield Strait Gerlache ENVELOPE(99.033,99.033,-66.500,-66.500) Gerlache Strait ENVELOPE(-62.333,-62.333,-64.500,-64.500) Journal of Plankton Research 23 12 1345 1360 |
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Open Polar |
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HighWire Press (Stanford University) |
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fthighwire |
language |
English |
topic |
ORIGINAL ARTICLES |
spellingShingle |
ORIGINAL ARTICLES Serret, Pablo Fernández, Emilio Anadón, Ricardo Varela, Manuel Trophic control of biogenic carbon export in Bransfield and Gerlache Straits, Antarctica |
topic_facet |
ORIGINAL ARTICLES |
description |
Size-fractionated chlorophyll a and photosynthetic carbon incorporation, microbial oxygen production and respiration and particulate vertical flux were measured in January 1996 at three regions, characterized by distinct hydrographic fields and planktonic communities, of the Antarctic Peninsula: (1) a diatom-Phaeocystis sp., dominated community associated with the relatively stratified waters of the Gerlache Strait, (2) a nanoplankton-Cryptomonas sp. dominated assemblage at the Gerlache–Bransfield confluence; and (3) a nano- and picoplankton community in mixed waters of the Bransfield Strait. Despite the marked differences in both community structure and total phytoplankton biomass and primary production, and against predictions from models about trophic control of C export, the lowest respiration rates were measured at Bransfield (pico- and nanoplankton), and no difference was observed between the Gerlache (large diatoms) and Bransfield stations in relative vertical particle flux (6.4 vs. 5.1 % of suspended C; 14.9 vs. 10.4 % of net community production, respectively). Growth and loss rates of the phytoplankton population studied for each community indicate that microbial populations can be explained by in situ growth, but spatial (diatom-Phaeocystis sp., bloom) and temporal (diatom-Phaeocystis sp. bloom and nanoplankton communities) scales of study were shown to be insufficient for addressing the coupling between primary production and biogenic carbon export, especially after the appreciation of the accumulation of dissolved organic carbon in the water column. This would explain the unexpected results and highlights the necessity of including the mechanisms controlling accumulation and consumption of dissolved organic matter into conceptual models about the trophic control of C export. |
format |
Text |
author |
Serret, Pablo Fernández, Emilio Anadón, Ricardo Varela, Manuel |
author_facet |
Serret, Pablo Fernández, Emilio Anadón, Ricardo Varela, Manuel |
author_sort |
Serret, Pablo |
title |
Trophic control of biogenic carbon export in Bransfield and Gerlache Straits, Antarctica |
title_short |
Trophic control of biogenic carbon export in Bransfield and Gerlache Straits, Antarctica |
title_full |
Trophic control of biogenic carbon export in Bransfield and Gerlache Straits, Antarctica |
title_fullStr |
Trophic control of biogenic carbon export in Bransfield and Gerlache Straits, Antarctica |
title_full_unstemmed |
Trophic control of biogenic carbon export in Bransfield and Gerlache Straits, Antarctica |
title_sort |
trophic control of biogenic carbon export in bransfield and gerlache straits, antarctica |
publisher |
Oxford University Press |
publishDate |
2001 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/23/12/1345 https://doi.org/10.1093/plankt/23.12.1345 |
long_lat |
ENVELOPE(99.033,99.033,-66.500,-66.500) ENVELOPE(-62.333,-62.333,-64.500,-64.500) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Bransfield Strait Gerlache Gerlache Strait |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Bransfield Strait Gerlache Gerlache Strait |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Bransfield Strait |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Bransfield Strait |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/23/12/1345 http://dx.doi.org/10.1093/plankt/23.12.1345 |
op_rights |
Copyright (C) 2001, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/23.12.1345 |
container_title |
Journal of Plankton Research |
container_volume |
23 |
container_issue |
12 |
container_start_page |
1345 |
op_container_end_page |
1360 |
_version_ |
1766253516120129536 |