Microbial iron uptake in the naturally fertilized waters in the vicinity of the Kerguelen Islands: phytoplankton–bacteria interactions
International audience Iron (Fe) uptake by the microbial community and the contribution of three different size fractions was determined during spring phytoplankton blooms in the naturally Fe-fertilized area off the Kerguelen Islands (KEOPS2). Total Fe uptake in surface waters was on average 34 ± 6...
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Online Access: | https://hal.sorbonne-universite.fr/hal-01207384 https://hal.sorbonne-universite.fr/hal-01207384/document https://hal.sorbonne-universite.fr/hal-01207384/file/bg-12-1893-2015.pdf https://doi.org/10.5194/bg-12-1893-2015 |
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ftccsdartic:oai:HAL:hal-01207384v1 2023-05-15T17:02:04+02:00 Microbial iron uptake in the naturally fertilized waters in the vicinity of the Kerguelen Islands: phytoplankton–bacteria interactions Fourquez, M. Obernosterer, I. Davies, D. M. Trull, T. W. Blain, S. Institute for Marine and Antarctic Studies Hobart (IMAS) University of Tasmania Hobart, Australia (UTAS) Laboratoire d'Océanographie Microbienne (LOMIC) Observatoire océanologique de Banyuls (OOB) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Antarctic Climate and Ecosystems Cooperative Research Centre (ACE-CRC) CSIRO Marine and Atmospheric Research (CSIRO-MAR) Commonwealth Scientific and Industrial Research Organisation Canberra (CSIRO) 2015 https://hal.sorbonne-universite.fr/hal-01207384 https://hal.sorbonne-universite.fr/hal-01207384/document https://hal.sorbonne-universite.fr/hal-01207384/file/bg-12-1893-2015.pdf https://doi.org/10.5194/bg-12-1893-2015 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-12-1893-2015 hal-01207384 https://hal.sorbonne-universite.fr/hal-01207384 https://hal.sorbonne-universite.fr/hal-01207384/document https://hal.sorbonne-universite.fr/hal-01207384/file/bg-12-1893-2015.pdf doi:10.5194/bg-12-1893-2015 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.sorbonne-universite.fr/hal-01207384 Biogeosciences, 2015, 12 (6), pp.1893-1906. ⟨10.5194/bg-12-1893-2015⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2015 ftccsdartic https://doi.org/10.5194/bg-12-1893-2015 2023-03-27T12:18:38Z International audience Iron (Fe) uptake by the microbial community and the contribution of three different size fractions was determined during spring phytoplankton blooms in the naturally Fe-fertilized area off the Kerguelen Islands (KEOPS2). Total Fe uptake in surface waters was on average 34 ± 6 pmol Fe L-1 d-1, and microplankton (> 25 μm size fraction; 40–69%) and pico-nanoplankton (0.8–25 μm size fraction; 29–59%) were the main contributors. The contribution of heterotrophic bacteria (0.2–0.8 μm size fraction) to total Fe uptake was low at all stations (1–2%). Iron uptake rates normalized to carbon biomass were highest for pico-nanoplankton above the Kerguelen Plateau and for microplankton in the downstream plume. We also investigated the potential competition between heterotrophic bacteria and phytoplankton for the access to Fe. Bacterial Fe uptake rates normalized to carbon biomass were highest in incubations with bacteria alone, and dropped in incubations containing other components of the microbial community. Interestingly, the decrease in bacterial Fe uptake rate (up to 26-fold) was most pronounced in incubations containing pico-nanoplankton and bacteria, while the bacterial Fe uptake was only reduced by 2- to 8-fold in incubations containing the whole community (bacteria + pico-nanoplankton + microplankton). In Fe-fertilized waters, the bacterial Fe uptake rates normalized to carbon biomass were positively correlated with primary production. Taken together, these results suggest that heterotrophic bacteria are outcompeted by small-sized phytoplankton cells for the access to Fe during the spring bloom development, most likely due to the limitation by organic matter. We conclude that the Fe and carbon cycles are tightly coupled and driven by a complex interplay of competition and synergy between different members of the microbial community. Article in Journal/Newspaper Kerguelen Islands Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Kerguelen Kerguelen Islands Biogeosciences 12 6 1893 1906 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Fourquez, M. Obernosterer, I. Davies, D. M. Trull, T. W. Blain, S. Microbial iron uptake in the naturally fertilized waters in the vicinity of the Kerguelen Islands: phytoplankton–bacteria interactions |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Iron (Fe) uptake by the microbial community and the contribution of three different size fractions was determined during spring phytoplankton blooms in the naturally Fe-fertilized area off the Kerguelen Islands (KEOPS2). Total Fe uptake in surface waters was on average 34 ± 6 pmol Fe L-1 d-1, and microplankton (> 25 μm size fraction; 40–69%) and pico-nanoplankton (0.8–25 μm size fraction; 29–59%) were the main contributors. The contribution of heterotrophic bacteria (0.2–0.8 μm size fraction) to total Fe uptake was low at all stations (1–2%). Iron uptake rates normalized to carbon biomass were highest for pico-nanoplankton above the Kerguelen Plateau and for microplankton in the downstream plume. We also investigated the potential competition between heterotrophic bacteria and phytoplankton for the access to Fe. Bacterial Fe uptake rates normalized to carbon biomass were highest in incubations with bacteria alone, and dropped in incubations containing other components of the microbial community. Interestingly, the decrease in bacterial Fe uptake rate (up to 26-fold) was most pronounced in incubations containing pico-nanoplankton and bacteria, while the bacterial Fe uptake was only reduced by 2- to 8-fold in incubations containing the whole community (bacteria + pico-nanoplankton + microplankton). In Fe-fertilized waters, the bacterial Fe uptake rates normalized to carbon biomass were positively correlated with primary production. Taken together, these results suggest that heterotrophic bacteria are outcompeted by small-sized phytoplankton cells for the access to Fe during the spring bloom development, most likely due to the limitation by organic matter. We conclude that the Fe and carbon cycles are tightly coupled and driven by a complex interplay of competition and synergy between different members of the microbial community. |
author2 |
Institute for Marine and Antarctic Studies Hobart (IMAS) University of Tasmania Hobart, Australia (UTAS) Laboratoire d'Océanographie Microbienne (LOMIC) Observatoire océanologique de Banyuls (OOB) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Antarctic Climate and Ecosystems Cooperative Research Centre (ACE-CRC) CSIRO Marine and Atmospheric Research (CSIRO-MAR) Commonwealth Scientific and Industrial Research Organisation Canberra (CSIRO) |
format |
Article in Journal/Newspaper |
author |
Fourquez, M. Obernosterer, I. Davies, D. M. Trull, T. W. Blain, S. |
author_facet |
Fourquez, M. Obernosterer, I. Davies, D. M. Trull, T. W. Blain, S. |
author_sort |
Fourquez, M. |
title |
Microbial iron uptake in the naturally fertilized waters in the vicinity of the Kerguelen Islands: phytoplankton–bacteria interactions |
title_short |
Microbial iron uptake in the naturally fertilized waters in the vicinity of the Kerguelen Islands: phytoplankton–bacteria interactions |
title_full |
Microbial iron uptake in the naturally fertilized waters in the vicinity of the Kerguelen Islands: phytoplankton–bacteria interactions |
title_fullStr |
Microbial iron uptake in the naturally fertilized waters in the vicinity of the Kerguelen Islands: phytoplankton–bacteria interactions |
title_full_unstemmed |
Microbial iron uptake in the naturally fertilized waters in the vicinity of the Kerguelen Islands: phytoplankton–bacteria interactions |
title_sort |
microbial iron uptake in the naturally fertilized waters in the vicinity of the kerguelen islands: phytoplankton–bacteria interactions |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.sorbonne-universite.fr/hal-01207384 https://hal.sorbonne-universite.fr/hal-01207384/document https://hal.sorbonne-universite.fr/hal-01207384/file/bg-12-1893-2015.pdf https://doi.org/10.5194/bg-12-1893-2015 |
geographic |
Kerguelen Kerguelen Islands |
geographic_facet |
Kerguelen Kerguelen Islands |
genre |
Kerguelen Islands |
genre_facet |
Kerguelen Islands |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.sorbonne-universite.fr/hal-01207384 Biogeosciences, 2015, 12 (6), pp.1893-1906. ⟨10.5194/bg-12-1893-2015⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-12-1893-2015 hal-01207384 https://hal.sorbonne-universite.fr/hal-01207384 https://hal.sorbonne-universite.fr/hal-01207384/document https://hal.sorbonne-universite.fr/hal-01207384/file/bg-12-1893-2015.pdf doi:10.5194/bg-12-1893-2015 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-12-1893-2015 |
container_title |
Biogeosciences |
container_volume |
12 |
container_issue |
6 |
container_start_page |
1893 |
op_container_end_page |
1906 |
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1766055303107837952 |