Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure
This study investigates the relationships between the spring phytoplankton commu- nity 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...
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ftunivfurg:oai:repositorio.furg.br:1/2413 2023-11-12T04:04:32+01:00 Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure Gonçalves-Araujo, Rafael Souza, Márcio Silva de Mendes, Carlos Rafael Borges Tavano, Virginia Maria Pollery, Ricardo Cesar Gonçalves Garcia, Carlos Alberto Eiras 2012 application/pdf http://repositorio.furg.br/handle/1/2413 eng eng GONÇALVES-ARAÚJO, Rafael et al. Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure. Journal Of Plankton Research, Oxford, v. 34, n. 5, p.399-415, 2012. Disponível em: <http://plankt.oxfordjournals.org/content/34/5/399.full>. Acesso em: 26 jul. 2012. 1464-3774 http://repositorio.furg.br/handle/1/2413 restrict access Brazil-Malvinas confluence Physical structure Nutrients Phytoplankton HPLC-CHEMTAX article 2012 ftunivfurg 2023-10-24T21:00:31Z This study investigates the relationships between the spring phytoplankton commu- nity 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 com-munities (44% of variation explained). Cluster and canonical correspondence ana-lyses 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 domi- nated 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica RI FURG (Repositório da Universidade Federal do Rio Grande) Antarctic |
institution |
Open Polar |
collection |
RI FURG (Repositório da Universidade Federal do Rio Grande) |
op_collection_id |
ftunivfurg |
language |
English |
topic |
Brazil-Malvinas confluence Physical structure Nutrients Phytoplankton HPLC-CHEMTAX |
spellingShingle |
Brazil-Malvinas confluence Physical structure Nutrients Phytoplankton HPLC-CHEMTAX Gonçalves-Araujo, Rafael Souza, Márcio Silva de Mendes, Carlos Rafael Borges Tavano, Virginia Maria Pollery, Ricardo Cesar Gonçalves Garcia, Carlos Alberto Eiras Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure |
topic_facet |
Brazil-Malvinas confluence Physical structure Nutrients Phytoplankton HPLC-CHEMTAX |
description |
This study investigates the relationships between the spring phytoplankton commu- nity 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 com-munities (44% of variation explained). Cluster and canonical correspondence ana-lyses 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 domi- nated 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 |
Article in Journal/Newspaper |
author |
Gonçalves-Araujo, Rafael Souza, Márcio Silva de Mendes, Carlos Rafael Borges Tavano, Virginia Maria Pollery, Ricardo Cesar Gonçalves Garcia, Carlos Alberto Eiras |
author_facet |
Gonçalves-Araujo, Rafael Souza, Márcio Silva de Mendes, Carlos Rafael Borges Tavano, Virginia Maria Pollery, Ricardo Cesar Gonçalves 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 |
publishDate |
2012 |
url |
http://repositorio.furg.br/handle/1/2413 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
GONÇALVES-ARAÚJO, Rafael et al. Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure. Journal Of Plankton Research, Oxford, v. 34, n. 5, p.399-415, 2012. Disponível em: <http://plankt.oxfordjournals.org/content/34/5/399.full>. Acesso em: 26 jul. 2012. 1464-3774 http://repositorio.furg.br/handle/1/2413 |
op_rights |
restrict access |
_version_ |
1782341670048628736 |