Some environmental factors influencing phytoplankton in the Southern Ocean around South Georgia
Data on phytoplankton and zooplankton biomass, and physical and chemical variables, are combined with a published multivariate description of diatom species composition to interpret variation within an area around South Georgia surveyed during an austral summer. Large-scale species distributions cou...
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1986
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Online Access: | http://nora.nerc.ac.uk/id/eprint/523151/ https://doi.org/10.1007/BF00443379 |
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ftnerc:oai:nora.nerc.ac.uk:523151 2023-05-15T13:41:43+02:00 Some environmental factors influencing phytoplankton in the Southern Ocean around South Georgia Priddle, J. Heywood, R.B. Theriot, E. 1986 http://nora.nerc.ac.uk/id/eprint/523151/ https://doi.org/10.1007/BF00443379 unknown Springer-Verlag Priddle, J.; Heywood, R.B.; Theriot, E. 1986 Some environmental factors influencing phytoplankton in the Southern Ocean around South Georgia. Polar Biology, 5 (2). 65-79. https://doi.org/10.1007/BF00443379 <https://doi.org/10.1007/BF00443379> Publication - Article PeerReviewed 1986 ftnerc https://doi.org/10.1007/BF00443379 2023-02-04T19:48:15Z Data on phytoplankton and zooplankton biomass, and physical and chemical variables, are combined with a published multivariate description of diatom species composition to interpret variation within an area around South Georgia surveyed during an austral summer. Large-scale species distributions could be equated to the different water masses which reflected the interaction of the Antarctic Circumpolar Current with the island and the Scotia Ridge. Small-scale factors were found to act at an interstation scale and imposed local variation on the biogeographic pattern. Nutrient depletion could be related to phytoplankton biomass but no single inorganic nutrient of those measured (NO3−N, PO4−P and silica) could be identified as important. The ratio Si:P appeared to be more important as an ecological factor. The impact of grazing by krill and other zooplankton could only be resolved as differences in phytoplankton biomass and phaeopigment content. Diatom species composition showed a relation to local krill abundance very different from that suggested by published studies, but could be explained as the effect of earlier grazing outside the study area. The effects of vertical mixing could not account for interstation differences as pycnocline depth was uniformly greater than euphotic depth, and vertical stability very low. Some comparison was made with data collected in 1926–31 by the Discovery Investigations. Significant differences in the distribution of certain taxa such as Chaetoceros criophilum and C. socialis were traced to major differences in hydrology. Article in Journal/Newspaper Antarc* Antarctic Polar Biology Southern Ocean Natural Environment Research Council: NERC Open Research Archive Antarctic Southern Ocean The Antarctic Austral Polar Biology 5 2 65 79 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
unknown |
description |
Data on phytoplankton and zooplankton biomass, and physical and chemical variables, are combined with a published multivariate description of diatom species composition to interpret variation within an area around South Georgia surveyed during an austral summer. Large-scale species distributions could be equated to the different water masses which reflected the interaction of the Antarctic Circumpolar Current with the island and the Scotia Ridge. Small-scale factors were found to act at an interstation scale and imposed local variation on the biogeographic pattern. Nutrient depletion could be related to phytoplankton biomass but no single inorganic nutrient of those measured (NO3−N, PO4−P and silica) could be identified as important. The ratio Si:P appeared to be more important as an ecological factor. The impact of grazing by krill and other zooplankton could only be resolved as differences in phytoplankton biomass and phaeopigment content. Diatom species composition showed a relation to local krill abundance very different from that suggested by published studies, but could be explained as the effect of earlier grazing outside the study area. The effects of vertical mixing could not account for interstation differences as pycnocline depth was uniformly greater than euphotic depth, and vertical stability very low. Some comparison was made with data collected in 1926–31 by the Discovery Investigations. Significant differences in the distribution of certain taxa such as Chaetoceros criophilum and C. socialis were traced to major differences in hydrology. |
format |
Article in Journal/Newspaper |
author |
Priddle, J. Heywood, R.B. Theriot, E. |
spellingShingle |
Priddle, J. Heywood, R.B. Theriot, E. Some environmental factors influencing phytoplankton in the Southern Ocean around South Georgia |
author_facet |
Priddle, J. Heywood, R.B. Theriot, E. |
author_sort |
Priddle, J. |
title |
Some environmental factors influencing phytoplankton in the Southern Ocean around South Georgia |
title_short |
Some environmental factors influencing phytoplankton in the Southern Ocean around South Georgia |
title_full |
Some environmental factors influencing phytoplankton in the Southern Ocean around South Georgia |
title_fullStr |
Some environmental factors influencing phytoplankton in the Southern Ocean around South Georgia |
title_full_unstemmed |
Some environmental factors influencing phytoplankton in the Southern Ocean around South Georgia |
title_sort |
some environmental factors influencing phytoplankton in the southern ocean around south georgia |
publisher |
Springer-Verlag |
publishDate |
1986 |
url |
http://nora.nerc.ac.uk/id/eprint/523151/ https://doi.org/10.1007/BF00443379 |
geographic |
Antarctic Southern Ocean The Antarctic Austral |
geographic_facet |
Antarctic Southern Ocean The Antarctic Austral |
genre |
Antarc* Antarctic Polar Biology Southern Ocean |
genre_facet |
Antarc* Antarctic Polar Biology Southern Ocean |
op_relation |
Priddle, J.; Heywood, R.B.; Theriot, E. 1986 Some environmental factors influencing phytoplankton in the Southern Ocean around South Georgia. Polar Biology, 5 (2). 65-79. https://doi.org/10.1007/BF00443379 <https://doi.org/10.1007/BF00443379> |
op_doi |
https://doi.org/10.1007/BF00443379 |
container_title |
Polar Biology |
container_volume |
5 |
container_issue |
2 |
container_start_page |
65 |
op_container_end_page |
79 |
_version_ |
1766154756878761984 |