Growth rates 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 ofthe Southern Ocean in both the past and present. The growth of theseAntarctic diatoms is limited by availability of iron (and light). Here wereport the first assessment of growth rates in relation to ironavailability of two truly...
Main Authors: | , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2001
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/5730/ https://hdl.handle.net/10013/epic.16293 |
id |
ftawi:oai:epic.awi.de:5730 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:5730 2023-09-05T13:13:20+02:00 Growth rates and small Southern Ocean diatoms in relation to availability of iron in natural seawater Timmermans, K. R. Gerringa, L. J. Baar, H. J. de van der Wagt, B. Veldhuis, M. J. Jong, J. T. de Croot, P. L. Boye, M. 2001 https://epic.awi.de/id/eprint/5730/ https://hdl.handle.net/10013/epic.16293 unknown Timmermans, K. R. , Gerringa, L. J. , Baar, H. J. d. , van der Wagt, B. , Veldhuis, M. J. , Jong, J. T. d. , Croot, P. L. and Boye, M. (2001) Growth rates and small Southern Ocean diatoms in relation to availability of iron in natural seawater , Limnology and Oceanography, 46 , pp. 260-266 . hdl:10013/epic.16293 EPIC3Limnology and Oceanography, 46, pp. 260-266 Article isiRev 2001 ftawi 2023-08-22T19:45:37Z Blooms of large diatoms dominate the CO2 drawdown and silicon cycle ofthe Southern Ocean in both the past and present. The growth of theseAntarctic diatoms is limited by availability of iron (and light). Here wereport the first assessment of growth rates in relation to ironavailability of two truly oceanic Antarctic diatom species, the large,chain-forming diatom Chaetoceros dichaeta and the small, uni-cellulardiatom C. brevis. In filtered natural, untreated Southern Ocean water, amaximum specific growth rate of 0.62 ± 0.09 d-1 and a Km for growth of 1.12x 10-9 M dissolved iron was calculated for C. dichaeta. This response couldonly be seen during a long-day light period. C. brevis maintained growthrates of 0.39 ± 0.09 d-1 with and without iron addition, even under-shortday light conditions, and could only be forced into iron limitation byadding the siderophore desferri-ferrioxamine B (DFB), an iron immobilisingagent. Using this approach, the low Km value for growth of 0.59 x 10-12 Mdissolved Fe was calculated for this species. The size class dependentgrowth response to iron (and light) confirms the key role of theseparameters in structuring Southern Ocean ecosystems, and thus the CO2dynamics and the silicon cycle. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Southern Ocean |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Blooms of large diatoms dominate the CO2 drawdown and silicon cycle ofthe Southern Ocean in both the past and present. The growth of theseAntarctic diatoms is limited by availability of iron (and light). Here wereport the first assessment of growth rates in relation to ironavailability of two truly oceanic Antarctic diatom species, the large,chain-forming diatom Chaetoceros dichaeta and the small, uni-cellulardiatom C. brevis. In filtered natural, untreated Southern Ocean water, amaximum specific growth rate of 0.62 ± 0.09 d-1 and a Km for growth of 1.12x 10-9 M dissolved iron was calculated for C. dichaeta. This response couldonly be seen during a long-day light period. C. brevis maintained growthrates of 0.39 ± 0.09 d-1 with and without iron addition, even under-shortday light conditions, and could only be forced into iron limitation byadding the siderophore desferri-ferrioxamine B (DFB), an iron immobilisingagent. Using this approach, the low Km value for growth of 0.59 x 10-12 Mdissolved Fe was calculated for this species. The size class dependentgrowth response to iron (and light) confirms the key role of theseparameters in structuring Southern Ocean ecosystems, and thus the CO2dynamics and the silicon cycle. |
format |
Article in Journal/Newspaper |
author |
Timmermans, K. R. Gerringa, L. J. Baar, H. J. de van der Wagt, B. Veldhuis, M. J. Jong, J. T. de Croot, P. L. Boye, M. |
spellingShingle |
Timmermans, K. R. Gerringa, L. J. Baar, H. J. de van der Wagt, B. Veldhuis, M. J. Jong, J. T. de Croot, P. L. Boye, M. Growth rates and small Southern Ocean diatoms in relation to availability of iron in natural seawater |
author_facet |
Timmermans, K. R. Gerringa, L. J. Baar, H. J. de van der Wagt, B. Veldhuis, M. J. Jong, J. T. de Croot, P. L. Boye, M. |
author_sort |
Timmermans, K. R. |
title |
Growth rates and small Southern Ocean diatoms in relation to availability of iron in natural seawater |
title_short |
Growth rates and small Southern Ocean diatoms in relation to availability of iron in natural seawater |
title_full |
Growth rates and small Southern Ocean diatoms in relation to availability of iron in natural seawater |
title_fullStr |
Growth rates and small Southern Ocean diatoms in relation to availability of iron in natural seawater |
title_full_unstemmed |
Growth rates and small Southern Ocean diatoms in relation to availability of iron in natural seawater |
title_sort |
growth rates and small southern ocean diatoms in relation to availability of iron in natural seawater |
publishDate |
2001 |
url |
https://epic.awi.de/id/eprint/5730/ https://hdl.handle.net/10013/epic.16293 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
EPIC3Limnology and Oceanography, 46, pp. 260-266 |
op_relation |
Timmermans, K. R. , Gerringa, L. J. , Baar, H. J. d. , van der Wagt, B. , Veldhuis, M. J. , Jong, J. T. d. , Croot, P. L. and Boye, M. (2001) Growth rates and small Southern Ocean diatoms in relation to availability of iron in natural seawater , Limnology and Oceanography, 46 , pp. 260-266 . hdl:10013/epic.16293 |
_version_ |
1776204656834248704 |