Factors controlling coccolithophore biogeography in the Southern Ocean
The biogeography of Southern Ocean phytoplankton controls the local biogeochemistry and the export of macronutrients to lower latitudes and depth. Of particular relevance is the competitive interaction between coccolithophores and diatoms, with the former being prevalent along the <q>Great Cal...
Published in: | Biogeosciences |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/bg-15-6997-2018 https://doaj.org/article/8a28492348fe4b15b1049ccd4473466b |
id |
ftdoajarticles:oai:doaj.org/article:8a28492348fe4b15b1049ccd4473466b |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:8a28492348fe4b15b1049ccd4473466b 2023-05-15T18:23:44+02:00 Factors controlling coccolithophore biogeography in the Southern Ocean C. Nissen M. Vogt M. Münnich N. Gruber F. A. Haumann 2018-11-01T00:00:00Z https://doi.org/10.5194/bg-15-6997-2018 https://doaj.org/article/8a28492348fe4b15b1049ccd4473466b EN eng Copernicus Publications https://www.biogeosciences.net/15/6997/2018/bg-15-6997-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-6997-2018 1726-4170 1726-4189 https://doaj.org/article/8a28492348fe4b15b1049ccd4473466b Biogeosciences, Vol 15, Pp 6997-7024 (2018) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2018 ftdoajarticles https://doi.org/10.5194/bg-15-6997-2018 2022-12-31T03:22:44Z The biogeography of Southern Ocean phytoplankton controls the local biogeochemistry and the export of macronutrients to lower latitudes and depth. Of particular relevance is the competitive interaction between coccolithophores and diatoms, with the former being prevalent along the <q>Great Calcite Belt</q> (40–60° S), while diatoms tend to dominate the regions south of 60° S. To address the factors controlling coccolithophore distribution and the competition between them and diatoms, we use a regional high-resolution model (ROMS–BEC) for the Southern Ocean (24–78° S) that has been extended to include an explicit representation of coccolithophores. We assess the relative importance of bottom-up (temperature, nutrients, light) and top-down (grazing by zooplankton) factors in controlling Southern Ocean coccolithophore biogeography over the course of the growing season. In our simulations, coccolithophores are an important member of the Southern Ocean phytoplankton community, contributing 17 % to annually integrated net primary productivity south of 30° S. Coccolithophore biomass is highest north of 50° S in late austral summer, when light levels are high and diatoms become limited by silicic acid. Furthermore, we find top-down factors to be a major control on the relative abundance of diatoms and coccolithophores in the Southern Ocean. Consequently, when assessing potential future changes in Southern Ocean coccolithophore abundance, both abiotic (temperature, light, and nutrients) and biotic factors (interaction with diatoms and zooplankton) need to be considered. Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles Austral Southern Ocean Biogeosciences 15 22 6997 7024 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 C. Nissen M. Vogt M. Münnich N. Gruber F. A. Haumann Factors controlling coccolithophore biogeography in the Southern Ocean |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
The biogeography of Southern Ocean phytoplankton controls the local biogeochemistry and the export of macronutrients to lower latitudes and depth. Of particular relevance is the competitive interaction between coccolithophores and diatoms, with the former being prevalent along the <q>Great Calcite Belt</q> (40–60° S), while diatoms tend to dominate the regions south of 60° S. To address the factors controlling coccolithophore distribution and the competition between them and diatoms, we use a regional high-resolution model (ROMS–BEC) for the Southern Ocean (24–78° S) that has been extended to include an explicit representation of coccolithophores. We assess the relative importance of bottom-up (temperature, nutrients, light) and top-down (grazing by zooplankton) factors in controlling Southern Ocean coccolithophore biogeography over the course of the growing season. In our simulations, coccolithophores are an important member of the Southern Ocean phytoplankton community, contributing 17 % to annually integrated net primary productivity south of 30° S. Coccolithophore biomass is highest north of 50° S in late austral summer, when light levels are high and diatoms become limited by silicic acid. Furthermore, we find top-down factors to be a major control on the relative abundance of diatoms and coccolithophores in the Southern Ocean. Consequently, when assessing potential future changes in Southern Ocean coccolithophore abundance, both abiotic (temperature, light, and nutrients) and biotic factors (interaction with diatoms and zooplankton) need to be considered. |
format |
Article in Journal/Newspaper |
author |
C. Nissen M. Vogt M. Münnich N. Gruber F. A. Haumann |
author_facet |
C. Nissen M. Vogt M. Münnich N. Gruber F. A. Haumann |
author_sort |
C. Nissen |
title |
Factors controlling coccolithophore biogeography in the Southern Ocean |
title_short |
Factors controlling coccolithophore biogeography in the Southern Ocean |
title_full |
Factors controlling coccolithophore biogeography in the Southern Ocean |
title_fullStr |
Factors controlling coccolithophore biogeography in the Southern Ocean |
title_full_unstemmed |
Factors controlling coccolithophore biogeography in the Southern Ocean |
title_sort |
factors controlling coccolithophore biogeography in the southern ocean |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-15-6997-2018 https://doaj.org/article/8a28492348fe4b15b1049ccd4473466b |
geographic |
Austral Southern Ocean |
geographic_facet |
Austral Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Biogeosciences, Vol 15, Pp 6997-7024 (2018) |
op_relation |
https://www.biogeosciences.net/15/6997/2018/bg-15-6997-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-6997-2018 1726-4170 1726-4189 https://doaj.org/article/8a28492348fe4b15b1049ccd4473466b |
op_doi |
https://doi.org/10.5194/bg-15-6997-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
22 |
container_start_page |
6997 |
op_container_end_page |
7024 |
_version_ |
1766203825092296704 |