Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure
This study investigates the relationships between the spring phytoplankton community and environmental factors in the Brazil-Malvinas confluence region. Phytoplankton community composition was determined by the high performance liquid chromatography/CHEMTAX approach, complemented with microscopic ex...
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Oxford University Press
2012
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fthighwire:oai:open-archive.highwire.org:plankt:34/5/399 2023-05-15T13:59:50+02:00 Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure Gonçalves-Araujo, Rafael De Souza, Márcio Silva Mendes, Carlos Rafael Borges Tavano, Virginia Maria Pollery, Ricardo Cesar Garcia, Carlos Alberto Eiras 2012-05-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/34/5/399 https://doi.org/10.1093/plankt/fbs013 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/34/5/399 http://dx.doi.org/10.1093/plankt/fbs013 Copyright (C) 2012, Oxford University Press ORIGINAL ARTICLES TEXT 2012 fthighwire https://doi.org/10.1093/plankt/fbs013 2013-05-27T02:44:54Z This study investigates the relationships between the spring phytoplankton community and environmental factors in the Brazil-Malvinas confluence region. Phytoplankton community composition was determined by the high performance liquid chromatography/CHEMTAX approach, complemented with microscopic examination. Abiotic factors included temperature, salinity, dissolved inorganic macronutrients (ammonium, nitrite, nitrate, phosphate and silicate), water column stability and upper mixed layer depth (UMLD). These environmental variables were reasonably informative to explain the variability of the phytoplankton communities (44% of variation explained). Cluster and canonical correspondence analyses allowed discrimination of four zones (coastal, Sub-Antarctic, tropical and intermediate zones), also identifiable in the T–S diagrams and in the nutrient spatial distribution patterns. The presence of nutrient-rich Sub-Antarctic waters was a major oceanographic feature, associated with diatoms and dinoflagellates. However, in the Sub-Antarctic zone, biomass was particularly low, probably as a result of grazing pressure, as suggested by chemical and biological indicators. In contrast, in oligotrophic tropical waters, phytoplankton was mainly composed by small nanoflagellates and cyanobacteria. A large intermediate zone was also dominated by nanoflagellates, mainly Phaeocystis antarctica , probably favored by strong water column stability. The coastal zone exhibited fairly similar conditions to those in the intermediate zone, but with deeper UMLD, a favorable condition for diatom growth. These results emphasize the importance of the properties of water masses and also biological processes such as grazing in structuring phytoplankton communities in the region. Text Antarc* Antarctic Antarctica HighWire Press (Stanford University) Antarctic Journal of Plankton Research 34 5 399 415 |
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HighWire Press (Stanford University) |
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English |
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ORIGINAL ARTICLES |
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ORIGINAL ARTICLES Gonçalves-Araujo, Rafael De Souza, Márcio Silva Mendes, Carlos Rafael Borges Tavano, Virginia Maria Pollery, Ricardo Cesar Garcia, Carlos Alberto Eiras Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure |
topic_facet |
ORIGINAL ARTICLES |
description |
This study investigates the relationships between the spring phytoplankton community and environmental factors in the Brazil-Malvinas confluence region. Phytoplankton community composition was determined by the high performance liquid chromatography/CHEMTAX approach, complemented with microscopic examination. Abiotic factors included temperature, salinity, dissolved inorganic macronutrients (ammonium, nitrite, nitrate, phosphate and silicate), water column stability and upper mixed layer depth (UMLD). These environmental variables were reasonably informative to explain the variability of the phytoplankton communities (44% of variation explained). Cluster and canonical correspondence analyses allowed discrimination of four zones (coastal, Sub-Antarctic, tropical and intermediate zones), also identifiable in the T–S diagrams and in the nutrient spatial distribution patterns. The presence of nutrient-rich Sub-Antarctic waters was a major oceanographic feature, associated with diatoms and dinoflagellates. However, in the Sub-Antarctic zone, biomass was particularly low, probably as a result of grazing pressure, as suggested by chemical and biological indicators. In contrast, in oligotrophic tropical waters, phytoplankton was mainly composed by small nanoflagellates and cyanobacteria. A large intermediate zone was also dominated by nanoflagellates, mainly Phaeocystis antarctica , probably favored by strong water column stability. The coastal zone exhibited fairly similar conditions to those in the intermediate zone, but with deeper UMLD, a favorable condition for diatom growth. These results emphasize the importance of the properties of water masses and also biological processes such as grazing in structuring phytoplankton communities in the region. |
format |
Text |
author |
Gonçalves-Araujo, Rafael De Souza, Márcio Silva Mendes, Carlos Rafael Borges Tavano, Virginia Maria Pollery, Ricardo Cesar Garcia, Carlos Alberto Eiras |
author_facet |
Gonçalves-Araujo, Rafael De Souza, Márcio Silva Mendes, Carlos Rafael Borges Tavano, Virginia Maria Pollery, Ricardo Cesar Garcia, Carlos Alberto Eiras |
author_sort |
Gonçalves-Araujo, Rafael |
title |
Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure |
title_short |
Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure |
title_full |
Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure |
title_fullStr |
Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure |
title_full_unstemmed |
Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure |
title_sort |
brazil-malvinas confluence: effects of environmental variability on phytoplankton community structure |
publisher |
Oxford University Press |
publishDate |
2012 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/34/5/399 https://doi.org/10.1093/plankt/fbs013 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/34/5/399 http://dx.doi.org/10.1093/plankt/fbs013 |
op_rights |
Copyright (C) 2012, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/fbs013 |
container_title |
Journal of Plankton Research |
container_volume |
34 |
container_issue |
5 |
container_start_page |
399 |
op_container_end_page |
415 |
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1766268745555116032 |