Regional and seasonal differences in microplankton biomass, productivity, and structure across the Scotia Sea: Implications for the export of biogenic carbon
Surveys of the microplankton communities of the Scotia Sea, Southern Ocean, were carried out during three separate seasons of interest, spring, summer, and autumn of consecutive years. The surveys were conducted along a south to north transect and covered areas of low and high productivity, as well...
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2012
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ftsouthampton:oai:eprints.soton.ac.uk:210499 2023-07-30T04:06:41+02:00 Regional and seasonal differences in microplankton biomass, productivity, and structure across the Scotia Sea: Implications for the export of biogenic carbon Korb, Rebecca E. Whitehouse, Michael J. Ward, Peter Gordon, Marina Venables, Hugh J. Poulton, Alex J. 2012-01 https://eprints.soton.ac.uk/210499/ unknown Korb, Rebecca E., Whitehouse, Michael J., Ward, Peter, Gordon, Marina, Venables, Hugh J. and Poulton, Alex J. (2012) Regional and seasonal differences in microplankton biomass, productivity, and structure across the Scotia Sea: Implications for the export of biogenic carbon. Deep Sea Research Part II: Topical Studies in Oceanography, 59-60, 67-77. (doi:10.1016/j.dsr2.2011.06.006 <http://dx.doi.org/10.1016/j.dsr2.2011.06.006>). Article PeerReviewed 2012 ftsouthampton https://doi.org/10.1016/j.dsr2.2011.06.006 2023-07-09T21:25:28Z Surveys of the microplankton communities of the Scotia Sea, Southern Ocean, were carried out during three separate seasons of interest, spring, summer, and autumn of consecutive years. The surveys were conducted along a south to north transect and covered areas of low and high productivity, as well as crossing deep, open water and shallow, bathymetric features. During the summer and autumn cruises, cluster analysis revealed four distinct communities that were broadly consistent between cruises. From south to north the zones in which the communities fell were as follows: SOUTH, stations in the south Scotia Sea; MID, stations in the central Scotia Sea; SW-SG, stations southwest of the island of South Georgia; and NW-SG, stations northwest of South Georgia. Two main groups dominated the microplankton communities in all zones and all seasons; diatoms and naked, heterotrophic dinoflagellates. However, the proportion of these groups, and the species of diatom present, varied between zones and between seasons. In the SOUTH zone, a cryptophyte bloom was observed during summer. Spring and autumn communities showed similar levels of Chl a (0.6–1.5 mg m?3) but shifted to increasing numbers and biomass of heavily silicified diatoms (Fragilariopsis spp. and Corethron pennatum). Dense, spring blooms of the MID zone were dominated by a weakly silicified diatom, Thalassiosira spp. This contrasted with production 10 times lower (?0.2 g C m?2 d?1) during the dinoflagellate composed, summer and autumn cruises. Closer to the island of South Georgia, lightly silicified diatoms became increasingly prevalent. In the SW-SG zone, such diatoms were found both in low Chl a (0.3 mg m?3) spring-time waters and in short-lived summer blooms. Autumn communities saw a switch to dinoflagellates co-inciding with decreasing light levels and depletion of macronutrients. Downstream of South Georgia, in the NW-SG zone, high productivity (up to 2.8 g C m?2 d?1) and long lasting blooms (3–6 months) were found on all seasons surveyed. The NW-SG ... Article in Journal/Newspaper Scotia Sea Southern Ocean University of Southampton: e-Prints Soton Scotia Sea Southern Ocean Deep Sea Research Part II: Topical Studies in Oceanography 59-60 67 77 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
unknown |
description |
Surveys of the microplankton communities of the Scotia Sea, Southern Ocean, were carried out during three separate seasons of interest, spring, summer, and autumn of consecutive years. The surveys were conducted along a south to north transect and covered areas of low and high productivity, as well as crossing deep, open water and shallow, bathymetric features. During the summer and autumn cruises, cluster analysis revealed four distinct communities that were broadly consistent between cruises. From south to north the zones in which the communities fell were as follows: SOUTH, stations in the south Scotia Sea; MID, stations in the central Scotia Sea; SW-SG, stations southwest of the island of South Georgia; and NW-SG, stations northwest of South Georgia. Two main groups dominated the microplankton communities in all zones and all seasons; diatoms and naked, heterotrophic dinoflagellates. However, the proportion of these groups, and the species of diatom present, varied between zones and between seasons. In the SOUTH zone, a cryptophyte bloom was observed during summer. Spring and autumn communities showed similar levels of Chl a (0.6–1.5 mg m?3) but shifted to increasing numbers and biomass of heavily silicified diatoms (Fragilariopsis spp. and Corethron pennatum). Dense, spring blooms of the MID zone were dominated by a weakly silicified diatom, Thalassiosira spp. This contrasted with production 10 times lower (?0.2 g C m?2 d?1) during the dinoflagellate composed, summer and autumn cruises. Closer to the island of South Georgia, lightly silicified diatoms became increasingly prevalent. In the SW-SG zone, such diatoms were found both in low Chl a (0.3 mg m?3) spring-time waters and in short-lived summer blooms. Autumn communities saw a switch to dinoflagellates co-inciding with decreasing light levels and depletion of macronutrients. Downstream of South Georgia, in the NW-SG zone, high productivity (up to 2.8 g C m?2 d?1) and long lasting blooms (3–6 months) were found on all seasons surveyed. The NW-SG ... |
format |
Article in Journal/Newspaper |
author |
Korb, Rebecca E. Whitehouse, Michael J. Ward, Peter Gordon, Marina Venables, Hugh J. Poulton, Alex J. |
spellingShingle |
Korb, Rebecca E. Whitehouse, Michael J. Ward, Peter Gordon, Marina Venables, Hugh J. Poulton, Alex J. Regional and seasonal differences in microplankton biomass, productivity, and structure across the Scotia Sea: Implications for the export of biogenic carbon |
author_facet |
Korb, Rebecca E. Whitehouse, Michael J. Ward, Peter Gordon, Marina Venables, Hugh J. Poulton, Alex J. |
author_sort |
Korb, Rebecca E. |
title |
Regional and seasonal differences in microplankton biomass, productivity, and structure across the Scotia Sea: Implications for the export of biogenic carbon |
title_short |
Regional and seasonal differences in microplankton biomass, productivity, and structure across the Scotia Sea: Implications for the export of biogenic carbon |
title_full |
Regional and seasonal differences in microplankton biomass, productivity, and structure across the Scotia Sea: Implications for the export of biogenic carbon |
title_fullStr |
Regional and seasonal differences in microplankton biomass, productivity, and structure across the Scotia Sea: Implications for the export of biogenic carbon |
title_full_unstemmed |
Regional and seasonal differences in microplankton biomass, productivity, and structure across the Scotia Sea: Implications for the export of biogenic carbon |
title_sort |
regional and seasonal differences in microplankton biomass, productivity, and structure across the scotia sea: implications for the export of biogenic carbon |
publishDate |
2012 |
url |
https://eprints.soton.ac.uk/210499/ |
geographic |
Scotia Sea Southern Ocean |
geographic_facet |
Scotia Sea Southern Ocean |
genre |
Scotia Sea Southern Ocean |
genre_facet |
Scotia Sea Southern Ocean |
op_relation |
Korb, Rebecca E., Whitehouse, Michael J., Ward, Peter, Gordon, Marina, Venables, Hugh J. and Poulton, Alex J. (2012) Regional and seasonal differences in microplankton biomass, productivity, and structure across the Scotia Sea: Implications for the export of biogenic carbon. Deep Sea Research Part II: Topical Studies in Oceanography, 59-60, 67-77. (doi:10.1016/j.dsr2.2011.06.006 <http://dx.doi.org/10.1016/j.dsr2.2011.06.006>). |
op_doi |
https://doi.org/10.1016/j.dsr2.2011.06.006 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
59-60 |
container_start_page |
67 |
op_container_end_page |
77 |
_version_ |
1772819535067348992 |