Fe and C co-limitation of heterotrophic bacteria in the naturally fertilized region off the Kerguelen Islands
It has been univocally shown that iron (Fe) is the primary limiting nutrient for phytoplankton metabolism in high-nutrient, low-chlorophyll (HNLC) waters, yet the question of how this trace metal affects heterotrophic microbial activity is far less understood. We investigated the role of Fe for bact...
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ftarchimer:oai:archimer.ifremer.fr:40255 2023-05-15T17:02:02+02:00 Fe and C co-limitation of heterotrophic bacteria in the naturally fertilized region off the Kerguelen Islands Obernosterer, I. Fourquez, M. Blain, S. 2015-03 application/pdf https://archimer.ifremer.fr/doc/00291/40255/38635.pdf https://archimer.ifremer.fr/doc/00291/40255/48217.pdf https://doi.org/10.5194/bg-12-1983-2015 https://archimer.ifremer.fr/doc/00291/40255/ eng eng Copernicus Gesellschaft Mbh https://archimer.ifremer.fr/doc/00291/40255/38635.pdf https://archimer.ifremer.fr/doc/00291/40255/48217.pdf doi:10.5194/bg-12-1983-2015 https://archimer.ifremer.fr/doc/00291/40255/ Author(s) 2015. CC Attribution 3.0 License info:eu-repo/semantics/openAccess restricted use CC-BY Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2015-03 , Vol. 12 , N. 6 , P. 1983-1992 text Publication info:eu-repo/semantics/article 2015 ftarchimer https://doi.org/10.5194/bg-12-1983-2015 2021-09-23T20:26:50Z It has been univocally shown that iron (Fe) is the primary limiting nutrient for phytoplankton metabolism in high-nutrient, low-chlorophyll (HNLC) waters, yet the question of how this trace metal affects heterotrophic microbial activity is far less understood. We investigated the role of Fe for bacterial heterotrophic production and growth at three contrasting sites in the naturally Fe-fertilized region east of the Kerguelen Islands and at one site in HNLC waters during the KEOPS2 (Kerguelen Ocean and Plateau Compared Study 2) cruise in spring 2011. We performed dark incubations of natural microbial communities amended either with iron (Fe, as FeCl3) or carbon (C, as trace-metal clean glucose), or a combination of both, and followed bacterial abundance and heterotrophic production for up to 7 days. Our results show that single and combined additions of Fe and C stimulated bulk and cell-specific bacterial production at the Fe-fertilized sites, while in HNLC waters only combined additions resulted in significant increases in these parameters. Bacterial abundance was enhanced in two out of the three experiments performed in Fe-fertilized waters but did not respond to Fe or C additions in HNLC waters. Our results provide evidence that both Fe and C are present at limiting concentrations for bacterial heterotrophic activity in the naturally fertilized region off the Kerguelen Islands in spring, while bacteria were co-limited by these elements in HNLC waters. These results shed new light on the role of Fe in bacterial heterotrophic metabolism in regions of the Southern Ocean that receive variable Fe inputs. Article in Journal/Newspaper Kerguelen Islands Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Kerguelen Kerguelen Islands Southern Ocean Biogeosciences 12 6 1983 1992 |
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Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
It has been univocally shown that iron (Fe) is the primary limiting nutrient for phytoplankton metabolism in high-nutrient, low-chlorophyll (HNLC) waters, yet the question of how this trace metal affects heterotrophic microbial activity is far less understood. We investigated the role of Fe for bacterial heterotrophic production and growth at three contrasting sites in the naturally Fe-fertilized region east of the Kerguelen Islands and at one site in HNLC waters during the KEOPS2 (Kerguelen Ocean and Plateau Compared Study 2) cruise in spring 2011. We performed dark incubations of natural microbial communities amended either with iron (Fe, as FeCl3) or carbon (C, as trace-metal clean glucose), or a combination of both, and followed bacterial abundance and heterotrophic production for up to 7 days. Our results show that single and combined additions of Fe and C stimulated bulk and cell-specific bacterial production at the Fe-fertilized sites, while in HNLC waters only combined additions resulted in significant increases in these parameters. Bacterial abundance was enhanced in two out of the three experiments performed in Fe-fertilized waters but did not respond to Fe or C additions in HNLC waters. Our results provide evidence that both Fe and C are present at limiting concentrations for bacterial heterotrophic activity in the naturally fertilized region off the Kerguelen Islands in spring, while bacteria were co-limited by these elements in HNLC waters. These results shed new light on the role of Fe in bacterial heterotrophic metabolism in regions of the Southern Ocean that receive variable Fe inputs. |
format |
Article in Journal/Newspaper |
author |
Obernosterer, I. Fourquez, M. Blain, S. |
spellingShingle |
Obernosterer, I. Fourquez, M. Blain, S. Fe and C co-limitation of heterotrophic bacteria in the naturally fertilized region off the Kerguelen Islands |
author_facet |
Obernosterer, I. Fourquez, M. Blain, S. |
author_sort |
Obernosterer, I. |
title |
Fe and C co-limitation of heterotrophic bacteria in the naturally fertilized region off the Kerguelen Islands |
title_short |
Fe and C co-limitation of heterotrophic bacteria in the naturally fertilized region off the Kerguelen Islands |
title_full |
Fe and C co-limitation of heterotrophic bacteria in the naturally fertilized region off the Kerguelen Islands |
title_fullStr |
Fe and C co-limitation of heterotrophic bacteria in the naturally fertilized region off the Kerguelen Islands |
title_full_unstemmed |
Fe and C co-limitation of heterotrophic bacteria in the naturally fertilized region off the Kerguelen Islands |
title_sort |
fe and c co-limitation of heterotrophic bacteria in the naturally fertilized region off the kerguelen islands |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2015 |
url |
https://archimer.ifremer.fr/doc/00291/40255/38635.pdf https://archimer.ifremer.fr/doc/00291/40255/48217.pdf https://doi.org/10.5194/bg-12-1983-2015 https://archimer.ifremer.fr/doc/00291/40255/ |
geographic |
Kerguelen Kerguelen Islands Southern Ocean |
geographic_facet |
Kerguelen Kerguelen Islands Southern Ocean |
genre |
Kerguelen Islands Southern Ocean |
genre_facet |
Kerguelen Islands Southern Ocean |
op_source |
Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2015-03 , Vol. 12 , N. 6 , P. 1983-1992 |
op_relation |
https://archimer.ifremer.fr/doc/00291/40255/38635.pdf https://archimer.ifremer.fr/doc/00291/40255/48217.pdf doi:10.5194/bg-12-1983-2015 https://archimer.ifremer.fr/doc/00291/40255/ |
op_rights |
Author(s) 2015. CC Attribution 3.0 License info:eu-repo/semantics/openAccess restricted use |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-12-1983-2015 |
container_title |
Biogeosciences |
container_volume |
12 |
container_issue |
6 |
container_start_page |
1983 |
op_container_end_page |
1992 |
_version_ |
1766055251525238784 |