The ecological and biogeochemical role of acantharia in the Southern Ocean
The study of the diversity and the function of larger protozooplankton (especially foraminifera, radiolaria and acantharia) in pelagic food webs, despite the extensive use of their mineral skeletons as proxies for palaeoceanographic reconstructions, has started only fairly recently. An important gro...
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ftawi:oai:epic.awi.de:16706 2023-05-15T18:25:32+02:00 The ecological and biogeochemical role of acantharia in the Southern Ocean Henjes, Joachim Jacquet, S. Assmy, Philipp Cardinal, D. Dehairs, F. Savoye, N. Montresor, M. Smetacek, Victor 2007 application/pdf https://epic.awi.de/id/eprint/16706/ https://epic.awi.de/id/eprint/16706/1/Hen2007b.pdf https://hdl.handle.net/10013/epic.26534 https://hdl.handle.net/10013/epic.26534.d001 unknown https://epic.awi.de/id/eprint/16706/1/Hen2007b.pdf https://hdl.handle.net/10013/epic.26534.d001 Henjes, J. orcid:0000-0002-6688-8802 , Jacquet, S. , Assmy, P. , Cardinal, D. , Dehairs, F. , Savoye, N. , Montresor, M. and Smetacek, V. (2007) The ecological and biogeochemical role of acantharia in the Southern Ocean , Gordon Research Conference on Polar Marine Science: An interdisciplinary look at processes over multiple scales of variability, 25-30 March 2007, Ventura, CA, USA. . hdl:10013/epic.26534 EPIC3Gordon Research Conference on Polar Marine Science: An interdisciplinary look at processes over multiple scales of variability, 25-30 March 2007, Ventura, CA, USA. Conference notRev 2007 ftawi 2021-12-24T15:31:51Z The study of the diversity and the function of larger protozooplankton (especially foraminifera, radiolaria and acantharia) in pelagic food webs, despite the extensive use of their mineral skeletons as proxies for palaeoceanographic reconstructions, has started only fairly recently. An important group, which comes to the fore as a biological proxy, are the acantharia. These delicate, free living, microphagic organisms form barium-enriched celestite (Ba/Sr SO4) skeletons. During the in situ iron fertilization experiments EisenEx and EIFEX acantharia showed very high abundances (up to 50 ind. L-1) already prior to the first fertilization, compared to much lower abundances of foraminifera and radiolaria, and their temporal response resembled the development of the phytoplankton bloom. Hence acantharia clearly have the capability to respond to enhanced biological productivity with population growth. Moreover, data on Ba and Sr content of individuals from EIFEX indicate that acantharia play a unique role in the barium and strontium cycle of the oceans. In this context, it has been suggested that these organisms influence barite (BaSO4) deposition in the sediments although the mechanisms leading to its formation are still under debate. The degree of barite deposition in the sediments is used as a proxy for biological productivity of the overlying water column. Conference Object Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Southern Ocean |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
The study of the diversity and the function of larger protozooplankton (especially foraminifera, radiolaria and acantharia) in pelagic food webs, despite the extensive use of their mineral skeletons as proxies for palaeoceanographic reconstructions, has started only fairly recently. An important group, which comes to the fore as a biological proxy, are the acantharia. These delicate, free living, microphagic organisms form barium-enriched celestite (Ba/Sr SO4) skeletons. During the in situ iron fertilization experiments EisenEx and EIFEX acantharia showed very high abundances (up to 50 ind. L-1) already prior to the first fertilization, compared to much lower abundances of foraminifera and radiolaria, and their temporal response resembled the development of the phytoplankton bloom. Hence acantharia clearly have the capability to respond to enhanced biological productivity with population growth. Moreover, data on Ba and Sr content of individuals from EIFEX indicate that acantharia play a unique role in the barium and strontium cycle of the oceans. In this context, it has been suggested that these organisms influence barite (BaSO4) deposition in the sediments although the mechanisms leading to its formation are still under debate. The degree of barite deposition in the sediments is used as a proxy for biological productivity of the overlying water column. |
format |
Conference Object |
author |
Henjes, Joachim Jacquet, S. Assmy, Philipp Cardinal, D. Dehairs, F. Savoye, N. Montresor, M. Smetacek, Victor |
spellingShingle |
Henjes, Joachim Jacquet, S. Assmy, Philipp Cardinal, D. Dehairs, F. Savoye, N. Montresor, M. Smetacek, Victor The ecological and biogeochemical role of acantharia in the Southern Ocean |
author_facet |
Henjes, Joachim Jacquet, S. Assmy, Philipp Cardinal, D. Dehairs, F. Savoye, N. Montresor, M. Smetacek, Victor |
author_sort |
Henjes, Joachim |
title |
The ecological and biogeochemical role of acantharia in the Southern Ocean |
title_short |
The ecological and biogeochemical role of acantharia in the Southern Ocean |
title_full |
The ecological and biogeochemical role of acantharia in the Southern Ocean |
title_fullStr |
The ecological and biogeochemical role of acantharia in the Southern Ocean |
title_full_unstemmed |
The ecological and biogeochemical role of acantharia in the Southern Ocean |
title_sort |
ecological and biogeochemical role of acantharia in the southern ocean |
publishDate |
2007 |
url |
https://epic.awi.de/id/eprint/16706/ https://epic.awi.de/id/eprint/16706/1/Hen2007b.pdf https://hdl.handle.net/10013/epic.26534 https://hdl.handle.net/10013/epic.26534.d001 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
EPIC3Gordon Research Conference on Polar Marine Science: An interdisciplinary look at processes over multiple scales of variability, 25-30 March 2007, Ventura, CA, USA. |
op_relation |
https://epic.awi.de/id/eprint/16706/1/Hen2007b.pdf https://hdl.handle.net/10013/epic.26534.d001 Henjes, J. orcid:0000-0002-6688-8802 , Jacquet, S. , Assmy, P. , Cardinal, D. , Dehairs, F. , Savoye, N. , Montresor, M. and Smetacek, V. (2007) The ecological and biogeochemical role of acantharia in the Southern Ocean , Gordon Research Conference on Polar Marine Science: An interdisciplinary look at processes over multiple scales of variability, 25-30 March 2007, Ventura, CA, USA. . hdl:10013/epic.26534 |
_version_ |
1766207067411972096 |