Microbial food web dynamics during spring phytoplankton blooms in the naturally iron-fertilized Kerguelen area (Southern Ocean)
Microbial food web dynamics were determined during the onset of several spring phytoplankton blooms induced by natural iron fertilization off Kerguelen Island in the Southern Ocean (KEOPS2). The abundances of heterotrophic bacteria and heterotrophic nanoflagellates, bacterial heterotrophic productio...
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fttriple:oai:gotriple.eu:10670/1.9l3t56 2023-05-15T18:25:00+02:00 Microbial food web dynamics during spring phytoplankton blooms in the naturally iron-fertilized Kerguelen area (Southern Ocean) Christaki, U. Lefevre, D. Georges, C. Colombet, J. Catala, P. Courties, C. Sime-ngando, T. Blain, S. Obernosterer, I. 2014-12-05 https://doi.org/10.5194/bg-11-6739-2014 https://archimer.ifremer.fr/doc/00291/40208/38996.pdf https://archimer.ifremer.fr/doc/00291/40208/38997.pdf https://archimer.ifremer.fr/doc/00291/40208/81218.pdf https://archimer.ifremer.fr/doc/00291/40208/ en eng Copernicus Gesellschaft Mbh doi:10.5194/bg-11-6739-2014 10670/1.9l3t56 https://archimer.ifremer.fr/doc/00291/40208/38996.pdf https://archimer.ifremer.fr/doc/00291/40208/38997.pdf https://archimer.ifremer.fr/doc/00291/40208/81218.pdf https://archimer.ifremer.fr/doc/00291/40208/ other Archimer, archive institutionnelle de l'Ifremer Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2014-12-05 , Vol. 11 , N. 23 , P. 6739-6753 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2014 fttriple https://doi.org/10.5194/bg-11-6739-2014 2023-01-22T16:35:20Z Microbial food web dynamics were determined during the onset of several spring phytoplankton blooms induced by natural iron fertilization off Kerguelen Island in the Southern Ocean (KEOPS2). The abundances of heterotrophic bacteria and heterotrophic nanoflagellates, bacterial heterotrophic production, bacterial respiration, and bacterial growth efficiency, were consistently higher in surface waters of the iron-fertilized sites than at the reference site in HNLC (high nutrient low chlorophyll) waters. The abundance of virus-like particles remained unchanged, but viral production increased by a factor of 6 in iron-fertilized waters. Bacterial heterotrophic production was significantly related to heterotrophic nanoflagellate abundance and viral production across all sites, with bacterial production explaining about 70 and 85 %, respectively, of the variance of each in the mixed layer (ML). Estimated rates of grazing and viral lysis, however, indicated that heterotrophic nanoflagellates accounted for a substantially higher loss of bacterial production (50 %) than viruses (11 %). Combining these results with rates of primary production and export determined for the study area, a budget for the flow of carbon through the microbial food web and higher trophic levels during the early (KEOPS2) and the late phase (KEOPS1) of the Kerguelen bloom is provided. Text Southern Ocean Unknown Kerguelen Kerguelen Island ENVELOPE(69.500,69.500,-49.250,-49.250) Southern Ocean Biogeosciences 11 23 6739 6753 |
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English |
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envir geo |
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envir geo Christaki, U. Lefevre, D. Georges, C. Colombet, J. Catala, P. Courties, C. Sime-ngando, T. Blain, S. Obernosterer, I. Microbial food web dynamics during spring phytoplankton blooms in the naturally iron-fertilized Kerguelen area (Southern Ocean) |
topic_facet |
envir geo |
description |
Microbial food web dynamics were determined during the onset of several spring phytoplankton blooms induced by natural iron fertilization off Kerguelen Island in the Southern Ocean (KEOPS2). The abundances of heterotrophic bacteria and heterotrophic nanoflagellates, bacterial heterotrophic production, bacterial respiration, and bacterial growth efficiency, were consistently higher in surface waters of the iron-fertilized sites than at the reference site in HNLC (high nutrient low chlorophyll) waters. The abundance of virus-like particles remained unchanged, but viral production increased by a factor of 6 in iron-fertilized waters. Bacterial heterotrophic production was significantly related to heterotrophic nanoflagellate abundance and viral production across all sites, with bacterial production explaining about 70 and 85 %, respectively, of the variance of each in the mixed layer (ML). Estimated rates of grazing and viral lysis, however, indicated that heterotrophic nanoflagellates accounted for a substantially higher loss of bacterial production (50 %) than viruses (11 %). Combining these results with rates of primary production and export determined for the study area, a budget for the flow of carbon through the microbial food web and higher trophic levels during the early (KEOPS2) and the late phase (KEOPS1) of the Kerguelen bloom is provided. |
format |
Text |
author |
Christaki, U. Lefevre, D. Georges, C. Colombet, J. Catala, P. Courties, C. Sime-ngando, T. Blain, S. Obernosterer, I. |
author_facet |
Christaki, U. Lefevre, D. Georges, C. Colombet, J. Catala, P. Courties, C. Sime-ngando, T. Blain, S. Obernosterer, I. |
author_sort |
Christaki, U. |
title |
Microbial food web dynamics during spring phytoplankton blooms in the naturally iron-fertilized Kerguelen area (Southern Ocean) |
title_short |
Microbial food web dynamics during spring phytoplankton blooms in the naturally iron-fertilized Kerguelen area (Southern Ocean) |
title_full |
Microbial food web dynamics during spring phytoplankton blooms in the naturally iron-fertilized Kerguelen area (Southern Ocean) |
title_fullStr |
Microbial food web dynamics during spring phytoplankton blooms in the naturally iron-fertilized Kerguelen area (Southern Ocean) |
title_full_unstemmed |
Microbial food web dynamics during spring phytoplankton blooms in the naturally iron-fertilized Kerguelen area (Southern Ocean) |
title_sort |
microbial food web dynamics during spring phytoplankton blooms in the naturally iron-fertilized kerguelen area (southern ocean) |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2014 |
url |
https://doi.org/10.5194/bg-11-6739-2014 https://archimer.ifremer.fr/doc/00291/40208/38996.pdf https://archimer.ifremer.fr/doc/00291/40208/38997.pdf https://archimer.ifremer.fr/doc/00291/40208/81218.pdf https://archimer.ifremer.fr/doc/00291/40208/ |
long_lat |
ENVELOPE(69.500,69.500,-49.250,-49.250) |
geographic |
Kerguelen Kerguelen Island Southern Ocean |
geographic_facet |
Kerguelen Kerguelen Island Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Archimer, archive institutionnelle de l'Ifremer Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2014-12-05 , Vol. 11 , N. 23 , P. 6739-6753 |
op_relation |
doi:10.5194/bg-11-6739-2014 10670/1.9l3t56 https://archimer.ifremer.fr/doc/00291/40208/38996.pdf https://archimer.ifremer.fr/doc/00291/40208/38997.pdf https://archimer.ifremer.fr/doc/00291/40208/81218.pdf https://archimer.ifremer.fr/doc/00291/40208/ |
op_rights |
other |
op_doi |
https://doi.org/10.5194/bg-11-6739-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
23 |
container_start_page |
6739 |
op_container_end_page |
6753 |
_version_ |
1766206117317181440 |