Environmental drivers of coccolithophore abundance and calcification across Drake Passage (Southern Ocean)
Although coccolithophores are not as common in the Southern Ocean as they are in sub-polar waters of the North Atlantic, a few species, such as Emiliania huxleyi , are found during the summer months. Little is actually known about the calcite production (CP) of these communities, or how their distri...
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ftunivcapetownir:oai:localhost:11427/34237 2023-05-15T13:32:17+02:00 Environmental drivers of coccolithophore abundance and calcification across Drake Passage (Southern Ocean) Poulton, Alex J Bakker, Dorothee C E Lucas, Mike I Stinchcombe, Mark C Tyrrell, Toby 2016 application/pdf http://hdl.handle.net/11427/34237 https://open.uct.ac.za/bitstream/11427/34237/1/PoultonAlexJ_Environmental_d_2016.pdf eng eng Faculty of Science Marine Research (MA-RE) Institute http://hdl.handle.net/11427/34237 https://open.uct.ac.za/bitstream/11427/34237/1/PoultonAlexJ_Environmental_d_2016.pdf Biogeosciences https://dx.doi.org/10.5194/bg-13-5917-2016 13 21 5917 - 5935 Burns Disaster Planning Humans Mass Casualty Incidents National Health Programs Practice Guidelines as Topic Societies Medical South Africa Journal Article 2016 ftunivcapetownir https://doi.org/10.5194/bg-13-5917-2016 2022-09-13T05:53:45Z Although coccolithophores are not as common in the Southern Ocean as they are in sub-polar waters of the North Atlantic, a few species, such as Emiliania huxleyi , are found during the summer months. Little is actually known about the calcite production (CP) of these communities, or how their distribution and physiology relates to environmental variables in this region. In February 2009, we made observations across Drake Passage (between South America and the Antarctic Peninsula) of coccolithophore distribution, CP, primary production, chlorophyll- a and macronutrient concentrations, irradiance and carbonate chemistry. Although CP represented less than 1 % of total carbon fixation, coccolithophores were widespread across Drake Passage. The B/C morphotype of E. huxleyi was the dominant coccolithophore, with low estimates of coccolith calcite (~ 0.01 pmol C coccolith −1 ) from biometric measurements. Both cell-normalised calcification (0.01–0.16 pmol C cell −1 d −1 ) and total CP (< 20 μmol C m −3 d −1 ) were much lower than those observed in the sub-polar North Atlantic where E. huxleyi morphotype A is dominant. However, estimates of coccolith production rates were similar (0.1–1.2 coccoliths cell −1 h −1 ) to previous measurements made in the sub-polar North Atlantic. A multivariate statistical approach found that temperature and irradiance together were best able to explain the observed variation in species distribution and abundance (Spearman's rank correlation ρ = 0.4, p < 0.01). Rates of calcification per cell and coccolith production, as well as community CP and E. huxleyi abundance, were all positively correlated (p < 0.05) to the strong latitudinal gradient in temperature, irradiance and calcite saturation states across Drake Passage. Broadly, our results lend support to recent suggestions that coccolithophores, especially E. huxleyi , are advancing pole-wards. However, our in situ observations indicate that this may owe more to sea-surface warming and increasing irradiance rather than increasing ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Drake Passage North Atlantic Southern Ocean University of Cape Town: OpenUCT Antarctic Antarctic Peninsula Drake Passage Southern Ocean The Antarctic Biogeosciences 13 21 5917 5935 |
institution |
Open Polar |
collection |
University of Cape Town: OpenUCT |
op_collection_id |
ftunivcapetownir |
language |
English |
topic |
Burns Disaster Planning Humans Mass Casualty Incidents National Health Programs Practice Guidelines as Topic Societies Medical South Africa |
spellingShingle |
Burns Disaster Planning Humans Mass Casualty Incidents National Health Programs Practice Guidelines as Topic Societies Medical South Africa Poulton, Alex J Bakker, Dorothee C E Lucas, Mike I Stinchcombe, Mark C Tyrrell, Toby Environmental drivers of coccolithophore abundance and calcification across Drake Passage (Southern Ocean) |
topic_facet |
Burns Disaster Planning Humans Mass Casualty Incidents National Health Programs Practice Guidelines as Topic Societies Medical South Africa |
description |
Although coccolithophores are not as common in the Southern Ocean as they are in sub-polar waters of the North Atlantic, a few species, such as Emiliania huxleyi , are found during the summer months. Little is actually known about the calcite production (CP) of these communities, or how their distribution and physiology relates to environmental variables in this region. In February 2009, we made observations across Drake Passage (between South America and the Antarctic Peninsula) of coccolithophore distribution, CP, primary production, chlorophyll- a and macronutrient concentrations, irradiance and carbonate chemistry. Although CP represented less than 1 % of total carbon fixation, coccolithophores were widespread across Drake Passage. The B/C morphotype of E. huxleyi was the dominant coccolithophore, with low estimates of coccolith calcite (~ 0.01 pmol C coccolith −1 ) from biometric measurements. Both cell-normalised calcification (0.01–0.16 pmol C cell −1 d −1 ) and total CP (< 20 μmol C m −3 d −1 ) were much lower than those observed in the sub-polar North Atlantic where E. huxleyi morphotype A is dominant. However, estimates of coccolith production rates were similar (0.1–1.2 coccoliths cell −1 h −1 ) to previous measurements made in the sub-polar North Atlantic. A multivariate statistical approach found that temperature and irradiance together were best able to explain the observed variation in species distribution and abundance (Spearman's rank correlation ρ = 0.4, p < 0.01). Rates of calcification per cell and coccolith production, as well as community CP and E. huxleyi abundance, were all positively correlated (p < 0.05) to the strong latitudinal gradient in temperature, irradiance and calcite saturation states across Drake Passage. Broadly, our results lend support to recent suggestions that coccolithophores, especially E. huxleyi , are advancing pole-wards. However, our in situ observations indicate that this may owe more to sea-surface warming and increasing irradiance rather than increasing ... |
format |
Article in Journal/Newspaper |
author |
Poulton, Alex J Bakker, Dorothee C E Lucas, Mike I Stinchcombe, Mark C Tyrrell, Toby |
author_facet |
Poulton, Alex J Bakker, Dorothee C E Lucas, Mike I Stinchcombe, Mark C Tyrrell, Toby |
author_sort |
Poulton, Alex J |
title |
Environmental drivers of coccolithophore abundance and calcification across Drake Passage (Southern Ocean) |
title_short |
Environmental drivers of coccolithophore abundance and calcification across Drake Passage (Southern Ocean) |
title_full |
Environmental drivers of coccolithophore abundance and calcification across Drake Passage (Southern Ocean) |
title_fullStr |
Environmental drivers of coccolithophore abundance and calcification across Drake Passage (Southern Ocean) |
title_full_unstemmed |
Environmental drivers of coccolithophore abundance and calcification across Drake Passage (Southern Ocean) |
title_sort |
environmental drivers of coccolithophore abundance and calcification across drake passage (southern ocean) |
publisher |
Faculty of Science |
publishDate |
2016 |
url |
http://hdl.handle.net/11427/34237 https://open.uct.ac.za/bitstream/11427/34237/1/PoultonAlexJ_Environmental_d_2016.pdf |
geographic |
Antarctic Antarctic Peninsula Drake Passage Southern Ocean The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Drake Passage Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Drake Passage North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Drake Passage North Atlantic Southern Ocean |
op_source |
Biogeosciences https://dx.doi.org/10.5194/bg-13-5917-2016 13 21 5917 - 5935 |
op_relation |
http://hdl.handle.net/11427/34237 https://open.uct.ac.za/bitstream/11427/34237/1/PoultonAlexJ_Environmental_d_2016.pdf |
op_doi |
https://doi.org/10.5194/bg-13-5917-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
21 |
container_start_page |
5917 |
op_container_end_page |
5935 |
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1766025652956299264 |