Distribution and abundance of marine microbes in the Southern Ocean between 30 and 80 degrees E
Our study, as part of the Baseline Research on Oceanography, Krill and the Environment, West (BROKE-West) survey, emphasised the vital role of sea-ice retreat and upwelling in controlling the distribution, abundance and composition of marine microbial communities in the seasonal ice zone (SIZ). Auto...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Online Access: | https://doi.org/10.1016/j.dsr2.2008.10.040 http://ecite.utas.edu.au/71302 |
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ftunivtasecite:oai:ecite.utas.edu.au:71302 2023-05-15T14:02:30+02:00 Distribution and abundance of marine microbes in the Southern Ocean between 30 and 80 degrees E Thomson, PG Davidson, A van den Enden, R Pearce, I Seuront, L Paterson, JS Williams, GD 2010 https://doi.org/10.1016/j.dsr2.2008.10.040 http://ecite.utas.edu.au/71302 en eng Pergamon-Elsevier Science Ltd http://dx.doi.org/10.1016/j.dsr2.2008.10.040 Thomson, PG and Davidson, A and van den Enden, R and Pearce, I and Seuront, L and Paterson, JS and Williams, GD, Distribution and abundance of marine microbes in the Southern Ocean between 30 and 80 degrees E, Deep-Sea Research Part II-Topical Studies in Oceanography, 57, (9-10) pp. 815-827. ISSN 0967-0645 (2010) [Refereed Article] http://ecite.utas.edu.au/71302 Earth Sciences Oceanography Biological Oceanography Refereed Article PeerReviewed 2010 ftunivtasecite https://doi.org/10.1016/j.dsr2.2008.10.040 2019-12-13T21:38:51Z Our study, as part of the Baseline Research on Oceanography, Krill and the Environment, West (BROKE-West) survey, emphasised the vital role of sea-ice retreat and upwelling in controlling the distribution, abundance and composition of marine microbial communities in the seasonal ice zone (SIZ). Autofluorescence or stains were used to detect the abundance of nanophytoplankton, heterotrophic nanoflagellates (HNF), virus like particles (VLP) and bacteria by flow cytometry. Correlations among microbial concentrations were determined and cluster analysis was performed to group sites of similar microbial composition and abundance. Distance to sea ice was the primary determinant of nanophytoplankton abundance and nanophytoplankton contributed up to 84% of the phytoplankton carbon biomass where melting sea ice caused shallow summer mixed layer depths. To the north, nanophytoplankton abundance was generally low except adjacent to the Southern Boundary (SB). HNF and bacterial abundance was positively correlated with the abundance of nanophytoplankton. Cluster analysis identified 5 groups of sites over the BROKE-West survey area. Clusters 1-4 grouped sites of different successional maturity of the microbial community along the continuum between bloom formation and senescence. Maturity increased with distance from the sea ice and, in areas of upwelling, with time since the development of phytoplankton blooms. Sites in cluster 5 occurred at the northernmost extreme of the survey area and were typical of communities in high nutrient low chlorophyll (HNLC) waters of the permanent open-ocean zone (POOZ) where phytoplankton growth was matched by mortality and decomposition. Synoptic-scale studies in Antarctic waters are rare but provide vital information about the control of microbial productivity, abundance and distribution in the Southern Ocean. Our study, covering over 40% of the SIZ off East Antarctica, enhances our understanding of the synoptic-scale factors that determine the structure and function of the microbial loop. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean eCite UTAS (University of Tasmania) Antarctic East Antarctica Southern Ocean Deep Sea Research Part II: Topical Studies in Oceanography 57 9-10 815 827 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Biological Oceanography |
spellingShingle |
Earth Sciences Oceanography Biological Oceanography Thomson, PG Davidson, A van den Enden, R Pearce, I Seuront, L Paterson, JS Williams, GD Distribution and abundance of marine microbes in the Southern Ocean between 30 and 80 degrees E |
topic_facet |
Earth Sciences Oceanography Biological Oceanography |
description |
Our study, as part of the Baseline Research on Oceanography, Krill and the Environment, West (BROKE-West) survey, emphasised the vital role of sea-ice retreat and upwelling in controlling the distribution, abundance and composition of marine microbial communities in the seasonal ice zone (SIZ). Autofluorescence or stains were used to detect the abundance of nanophytoplankton, heterotrophic nanoflagellates (HNF), virus like particles (VLP) and bacteria by flow cytometry. Correlations among microbial concentrations were determined and cluster analysis was performed to group sites of similar microbial composition and abundance. Distance to sea ice was the primary determinant of nanophytoplankton abundance and nanophytoplankton contributed up to 84% of the phytoplankton carbon biomass where melting sea ice caused shallow summer mixed layer depths. To the north, nanophytoplankton abundance was generally low except adjacent to the Southern Boundary (SB). HNF and bacterial abundance was positively correlated with the abundance of nanophytoplankton. Cluster analysis identified 5 groups of sites over the BROKE-West survey area. Clusters 1-4 grouped sites of different successional maturity of the microbial community along the continuum between bloom formation and senescence. Maturity increased with distance from the sea ice and, in areas of upwelling, with time since the development of phytoplankton blooms. Sites in cluster 5 occurred at the northernmost extreme of the survey area and were typical of communities in high nutrient low chlorophyll (HNLC) waters of the permanent open-ocean zone (POOZ) where phytoplankton growth was matched by mortality and decomposition. Synoptic-scale studies in Antarctic waters are rare but provide vital information about the control of microbial productivity, abundance and distribution in the Southern Ocean. Our study, covering over 40% of the SIZ off East Antarctica, enhances our understanding of the synoptic-scale factors that determine the structure and function of the microbial loop. |
format |
Article in Journal/Newspaper |
author |
Thomson, PG Davidson, A van den Enden, R Pearce, I Seuront, L Paterson, JS Williams, GD |
author_facet |
Thomson, PG Davidson, A van den Enden, R Pearce, I Seuront, L Paterson, JS Williams, GD |
author_sort |
Thomson, PG |
title |
Distribution and abundance of marine microbes in the Southern Ocean between 30 and 80 degrees E |
title_short |
Distribution and abundance of marine microbes in the Southern Ocean between 30 and 80 degrees E |
title_full |
Distribution and abundance of marine microbes in the Southern Ocean between 30 and 80 degrees E |
title_fullStr |
Distribution and abundance of marine microbes in the Southern Ocean between 30 and 80 degrees E |
title_full_unstemmed |
Distribution and abundance of marine microbes in the Southern Ocean between 30 and 80 degrees E |
title_sort |
distribution and abundance of marine microbes in the southern ocean between 30 and 80 degrees e |
publisher |
Pergamon-Elsevier Science Ltd |
publishDate |
2010 |
url |
https://doi.org/10.1016/j.dsr2.2008.10.040 http://ecite.utas.edu.au/71302 |
geographic |
Antarctic East Antarctica Southern Ocean |
geographic_facet |
Antarctic East Antarctica Southern Ocean |
genre |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
op_relation |
http://dx.doi.org/10.1016/j.dsr2.2008.10.040 Thomson, PG and Davidson, A and van den Enden, R and Pearce, I and Seuront, L and Paterson, JS and Williams, GD, Distribution and abundance of marine microbes in the Southern Ocean between 30 and 80 degrees E, Deep-Sea Research Part II-Topical Studies in Oceanography, 57, (9-10) pp. 815-827. ISSN 0967-0645 (2010) [Refereed Article] http://ecite.utas.edu.au/71302 |
op_doi |
https://doi.org/10.1016/j.dsr2.2008.10.040 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
57 |
container_issue |
9-10 |
container_start_page |
815 |
op_container_end_page |
827 |
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1766272767694471168 |