Coccolithophore populations and their contribution to carbonate export during an annual cycle in the Australian sector of the Antarctic zone
The Southern Ocean is experiencing rapid and relentless change in its physical and biogeochemical properties. The rate of warming of the Antarctic Circumpolar Current exceeds that of the global ocean, and the enhanced uptake of carbon dioxide is causing basin-wide ocean acidification. Observational...
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ftdoajarticles:oai:doaj.org/article:e4fe84f1e5d44b5ab916218c3baf285c 2023-05-15T13:59:44+02:00 Coccolithophore populations and their contribution to carbonate export during an annual cycle in the Australian sector of the Antarctic zone A. S. Rigual Hernández J. A. Flores F. J. Sierro M. A. Fuertes L. Cros T. W. Trull 2018-03-01T00:00:00Z https://doi.org/10.5194/bg-15-1843-2018 https://doaj.org/article/e4fe84f1e5d44b5ab916218c3baf285c EN eng Copernicus Publications https://www.biogeosciences.net/15/1843/2018/bg-15-1843-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-1843-2018 1726-4170 1726-4189 https://doaj.org/article/e4fe84f1e5d44b5ab916218c3baf285c Biogeosciences, Vol 15, Pp 1843-1862 (2018) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2018 ftdoajarticles https://doi.org/10.5194/bg-15-1843-2018 2022-12-31T03:43:29Z The Southern Ocean is experiencing rapid and relentless change in its physical and biogeochemical properties. The rate of warming of the Antarctic Circumpolar Current exceeds that of the global ocean, and the enhanced uptake of carbon dioxide is causing basin-wide ocean acidification. Observational data suggest that these changes are influencing the distribution and composition of pelagic plankton communities. Long-term and annual field observations on key environmental variables and organisms are a critical basis for predicting changes in Southern Ocean ecosystems. These observations are particularly needed, since high-latitude systems have been projected to experience the most severe impacts of ocean acidification and invasions of allochthonous species. Coccolithophores are the most prolific calcium-carbonate-producing phytoplankton group playing an important role in Southern Ocean biogeochemical cycles. Satellite imagery has revealed elevated particulate inorganic carbon concentrations near the major circumpolar fronts of the Southern Ocean that can be attributed to the coccolithophore Emiliania huxleyi . Recent studies have suggested changes during the last decades in the distribution and abundance of Southern Ocean coccolithophores. However, due to limited field observations, the distribution, diversity and state of coccolithophore populations in the Southern Ocean remain poorly characterised. We report here on seasonal variations in the abundance and composition of coccolithophore assemblages collected by two moored sediment traps deployed at the Antarctic zone south of Australia (2000 and 3700 m of depth) for 1 year in 2001–2002. Additionally, seasonal changes in coccolith weights of E. huxleyi populations were estimated using circularly polarised micrographs analysed with C-Calcita software. Our findings indicate that (1) coccolithophore sinking assemblages were nearly monospecific for E. huxleyi morphotype B/C in the Antarctic zone waters in 2001–2002; (2) coccoliths captured by the traps experienced ... Article in Journal/Newspaper Antarc* Antarctic Ocean acidification Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean The Antarctic Biogeosciences 15 6 1843 1862 |
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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 A. S. Rigual Hernández J. A. Flores F. J. Sierro M. A. Fuertes L. Cros T. W. Trull Coccolithophore populations and their contribution to carbonate export during an annual cycle in the Australian sector of the Antarctic zone |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
The Southern Ocean is experiencing rapid and relentless change in its physical and biogeochemical properties. The rate of warming of the Antarctic Circumpolar Current exceeds that of the global ocean, and the enhanced uptake of carbon dioxide is causing basin-wide ocean acidification. Observational data suggest that these changes are influencing the distribution and composition of pelagic plankton communities. Long-term and annual field observations on key environmental variables and organisms are a critical basis for predicting changes in Southern Ocean ecosystems. These observations are particularly needed, since high-latitude systems have been projected to experience the most severe impacts of ocean acidification and invasions of allochthonous species. Coccolithophores are the most prolific calcium-carbonate-producing phytoplankton group playing an important role in Southern Ocean biogeochemical cycles. Satellite imagery has revealed elevated particulate inorganic carbon concentrations near the major circumpolar fronts of the Southern Ocean that can be attributed to the coccolithophore Emiliania huxleyi . Recent studies have suggested changes during the last decades in the distribution and abundance of Southern Ocean coccolithophores. However, due to limited field observations, the distribution, diversity and state of coccolithophore populations in the Southern Ocean remain poorly characterised. We report here on seasonal variations in the abundance and composition of coccolithophore assemblages collected by two moored sediment traps deployed at the Antarctic zone south of Australia (2000 and 3700 m of depth) for 1 year in 2001–2002. Additionally, seasonal changes in coccolith weights of E. huxleyi populations were estimated using circularly polarised micrographs analysed with C-Calcita software. Our findings indicate that (1) coccolithophore sinking assemblages were nearly monospecific for E. huxleyi morphotype B/C in the Antarctic zone waters in 2001–2002; (2) coccoliths captured by the traps experienced ... |
format |
Article in Journal/Newspaper |
author |
A. S. Rigual Hernández J. A. Flores F. J. Sierro M. A. Fuertes L. Cros T. W. Trull |
author_facet |
A. S. Rigual Hernández J. A. Flores F. J. Sierro M. A. Fuertes L. Cros T. W. Trull |
author_sort |
A. S. Rigual Hernández |
title |
Coccolithophore populations and their contribution to carbonate export during an annual cycle in the Australian sector of the Antarctic zone |
title_short |
Coccolithophore populations and their contribution to carbonate export during an annual cycle in the Australian sector of the Antarctic zone |
title_full |
Coccolithophore populations and their contribution to carbonate export during an annual cycle in the Australian sector of the Antarctic zone |
title_fullStr |
Coccolithophore populations and their contribution to carbonate export during an annual cycle in the Australian sector of the Antarctic zone |
title_full_unstemmed |
Coccolithophore populations and their contribution to carbonate export during an annual cycle in the Australian sector of the Antarctic zone |
title_sort |
coccolithophore populations and their contribution to carbonate export during an annual cycle in the australian sector of the antarctic zone |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-15-1843-2018 https://doaj.org/article/e4fe84f1e5d44b5ab916218c3baf285c |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ocean acidification Southern Ocean |
genre_facet |
Antarc* Antarctic Ocean acidification Southern Ocean |
op_source |
Biogeosciences, Vol 15, Pp 1843-1862 (2018) |
op_relation |
https://www.biogeosciences.net/15/1843/2018/bg-15-1843-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-1843-2018 1726-4170 1726-4189 https://doaj.org/article/e4fe84f1e5d44b5ab916218c3baf285c |
op_doi |
https://doi.org/10.5194/bg-15-1843-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
6 |
container_start_page |
1843 |
op_container_end_page |
1862 |
_version_ |
1766268503329865728 |