Growth rates of large and small Southern Ocean diatoms in relation to availability of iron in natural seawater
Blooms of large diatoms dominate the CO2 drawdown and silicon cycle of the Southern Ocean in both the past and present. The growth of these Antarctic diatoms is limited by availability of iron (and light). Here we report the first assessment of growth rates in relation to iron availability of two tr...
Published in: | Limnology and Oceanography |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2001
|
Subjects: | |
Online Access: | https://hdl.handle.net/11370/3ace8029-63f0-40cb-a812-7eb6acc7635c https://research.rug.nl/en/publications/3ace8029-63f0-40cb-a812-7eb6acc7635c https://doi.org/10.4319/lo.2001.46.2.0260 https://pure.rug.nl/ws/files/14507771/2001LimnolOceanogrTimmermans1.pdf |
id |
ftunigroningenpu:oai:pure.rug.nl:publications/3ace8029-63f0-40cb-a812-7eb6acc7635c |
---|---|
record_format |
openpolar |
spelling |
ftunigroningenpu:oai:pure.rug.nl:publications/3ace8029-63f0-40cb-a812-7eb6acc7635c 2024-06-02T07:56:18+00:00 Growth rates of large and small Southern Ocean diatoms in relation to availability of iron in natural seawater Timmermans, Klaas R. Gerringa, Loes J.A. Baar, Hein J.W. de Wagt, Bas van der Veldhuis, Marcel J.W. Jong, Jeroen T.M. de Croot, Peter L. Boye, Marie 2001 application/pdf https://hdl.handle.net/11370/3ace8029-63f0-40cb-a812-7eb6acc7635c https://research.rug.nl/en/publications/3ace8029-63f0-40cb-a812-7eb6acc7635c https://doi.org/10.4319/lo.2001.46.2.0260 https://pure.rug.nl/ws/files/14507771/2001LimnolOceanogrTimmermans1.pdf eng eng https://research.rug.nl/en/publications/3ace8029-63f0-40cb-a812-7eb6acc7635c info:eu-repo/semantics/openAccess Timmermans , K R , Gerringa , L J A , Baar , H J W D , Wagt , B V D , Veldhuis , M J W , Jong , J T M D , Croot , P L & Boye , M 2001 , ' Growth rates of large and small Southern Ocean diatoms in relation to availability of iron in natural seawater ' , Limnology and Oceanography , vol. 46 , no. 2 , pp. 260-266 . https://doi.org/10.4319/lo.2001.46.2.0260 article 2001 ftunigroningenpu https://doi.org/10.4319/lo.2001.46.2.0260 2024-05-07T19:24:48Z Blooms of large diatoms dominate the CO2 drawdown and silicon cycle of the Southern Ocean in both the past and present. The growth of these Antarctic diatoms is limited by availability of iron (and light). Here we report the first assessment of growth rates in relation to iron availability of two truly oceanic Antarctic diatom species, the large, chain-forming diatom Chaetoceros dichaeta and the small, unicellular diatom C. brevis. In filtered natural, untreated Southern Ocean water, a maximum specific growth rate of 0.62 ± 0.09 d-1 and a Km for growth of 1.12 × 10-9 M dissolved iron was calculated for C. dichaeta. This response could only be seen during a long-day light period. C. brevis maintained growth rates of 0.39 ± 0.09 d-1 with and without iron addition, even under short-day light conditions, and could only be forced into iron limitation by adding the siderophore desferri-ferrioxamine B (DFB), an iron immobilizing agent. Using this approach, the low Km value for growth of 0.59 × 10-12 M dissolved Fe was calculated for this species. The size-class dependent growth response to iron (and light) confirms the key role of these parameters in structuring Southern Ocean ecosystems and thus the CO2 dynamics and the silicon cycle. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean University of Groningen research database Antarctic Southern Ocean Limnology and Oceanography 46 2 260 266 |
institution |
Open Polar |
collection |
University of Groningen research database |
op_collection_id |
ftunigroningenpu |
language |
English |
description |
Blooms of large diatoms dominate the CO2 drawdown and silicon cycle of the Southern Ocean in both the past and present. The growth of these Antarctic diatoms is limited by availability of iron (and light). Here we report the first assessment of growth rates in relation to iron availability of two truly oceanic Antarctic diatom species, the large, chain-forming diatom Chaetoceros dichaeta and the small, unicellular diatom C. brevis. In filtered natural, untreated Southern Ocean water, a maximum specific growth rate of 0.62 ± 0.09 d-1 and a Km for growth of 1.12 × 10-9 M dissolved iron was calculated for C. dichaeta. This response could only be seen during a long-day light period. C. brevis maintained growth rates of 0.39 ± 0.09 d-1 with and without iron addition, even under short-day light conditions, and could only be forced into iron limitation by adding the siderophore desferri-ferrioxamine B (DFB), an iron immobilizing agent. Using this approach, the low Km value for growth of 0.59 × 10-12 M dissolved Fe was calculated for this species. The size-class dependent growth response to iron (and light) confirms the key role of these parameters in structuring Southern Ocean ecosystems and thus the CO2 dynamics and the silicon cycle. |
format |
Article in Journal/Newspaper |
author |
Timmermans, Klaas R. Gerringa, Loes J.A. Baar, Hein J.W. de Wagt, Bas van der Veldhuis, Marcel J.W. Jong, Jeroen T.M. de Croot, Peter L. Boye, Marie |
spellingShingle |
Timmermans, Klaas R. Gerringa, Loes J.A. Baar, Hein J.W. de Wagt, Bas van der Veldhuis, Marcel J.W. Jong, Jeroen T.M. de Croot, Peter L. Boye, Marie Growth rates of large and small Southern Ocean diatoms in relation to availability of iron in natural seawater |
author_facet |
Timmermans, Klaas R. Gerringa, Loes J.A. Baar, Hein J.W. de Wagt, Bas van der Veldhuis, Marcel J.W. Jong, Jeroen T.M. de Croot, Peter L. Boye, Marie |
author_sort |
Timmermans, Klaas R. |
title |
Growth rates of large and small Southern Ocean diatoms in relation to availability of iron in natural seawater |
title_short |
Growth rates of large and small Southern Ocean diatoms in relation to availability of iron in natural seawater |
title_full |
Growth rates of large and small Southern Ocean diatoms in relation to availability of iron in natural seawater |
title_fullStr |
Growth rates of large and small Southern Ocean diatoms in relation to availability of iron in natural seawater |
title_full_unstemmed |
Growth rates of large and small Southern Ocean diatoms in relation to availability of iron in natural seawater |
title_sort |
growth rates of large and small southern ocean diatoms in relation to availability of iron in natural seawater |
publishDate |
2001 |
url |
https://hdl.handle.net/11370/3ace8029-63f0-40cb-a812-7eb6acc7635c https://research.rug.nl/en/publications/3ace8029-63f0-40cb-a812-7eb6acc7635c https://doi.org/10.4319/lo.2001.46.2.0260 https://pure.rug.nl/ws/files/14507771/2001LimnolOceanogrTimmermans1.pdf |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Timmermans , K R , Gerringa , L J A , Baar , H J W D , Wagt , B V D , Veldhuis , M J W , Jong , J T M D , Croot , P L & Boye , M 2001 , ' Growth rates of large and small Southern Ocean diatoms in relation to availability of iron in natural seawater ' , Limnology and Oceanography , vol. 46 , no. 2 , pp. 260-266 . https://doi.org/10.4319/lo.2001.46.2.0260 |
op_relation |
https://research.rug.nl/en/publications/3ace8029-63f0-40cb-a812-7eb6acc7635c |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.4319/lo.2001.46.2.0260 |
container_title |
Limnology and Oceanography |
container_volume |
46 |
container_issue |
2 |
container_start_page |
260 |
op_container_end_page |
266 |
_version_ |
1800754952604221440 |