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...
Published in: | Journal of Plankton Research |
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Oxford University Press
2012
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Online Access: | https://epic.awi.de/id/eprint/34422/ https://epic.awi.de/id/eprint/34422/2/Goncalves-Araujo_etal_2013_JPR.pdf http://plankt.oxfordjournals.org/content/34/5/399 https://hdl.handle.net/10013/epic.42672 https://hdl.handle.net/10013/epic.42672.d002 |
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ftawi:oai:epic.awi.de:34422 2023-05-15T13:40:26+02:00 Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure Goncalves Araujo, R. De Souza, M. S. Mendes, C. R. B. Tavano, V. M. Pollery, R. C. Garcia, C. A. E. 2012 application/pdf https://epic.awi.de/id/eprint/34422/ https://epic.awi.de/id/eprint/34422/2/Goncalves-Araujo_etal_2013_JPR.pdf http://plankt.oxfordjournals.org/content/34/5/399 https://hdl.handle.net/10013/epic.42672 https://hdl.handle.net/10013/epic.42672.d002 unknown Oxford University Press https://epic.awi.de/id/eprint/34422/2/Goncalves-Araujo_etal_2013_JPR.pdf https://hdl.handle.net/10013/epic.42672.d002 Goncalves Araujo, R. , De Souza, M. S. , Mendes, C. R. B. , Tavano, V. M. , Pollery, R. C. and Garcia, C. A. E. (2012) Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure , Journal of Plankton Research, 34 (5), pp. 399-415 . doi:10.1093/plankt/fbs013 <https://doi.org/10.1093/plankt%2Ffbs013> , hdl:10013/epic.42672 EPIC3Journal of Plankton Research, Oxford University Press, 34(5), pp. 399-415, ISSN: 0142-7873 Article isiRev 2012 ftawi https://doi.org/10.1093/plankt/fbs013 2021-12-24T15:39:10Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Journal of Plankton Research 34 5 399 415 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
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 |
Article in Journal/Newspaper |
author |
Goncalves Araujo, R. De Souza, M. S. Mendes, C. R. B. Tavano, V. M. Pollery, R. C. Garcia, C. A. E. |
spellingShingle |
Goncalves Araujo, R. De Souza, M. S. Mendes, C. R. B. Tavano, V. M. Pollery, R. C. Garcia, C. A. E. Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure |
author_facet |
Goncalves Araujo, R. De Souza, M. S. Mendes, C. R. B. Tavano, V. M. Pollery, R. C. Garcia, C. A. E. |
author_sort |
Goncalves Araujo, R. |
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 |
https://epic.awi.de/id/eprint/34422/ https://epic.awi.de/id/eprint/34422/2/Goncalves-Araujo_etal_2013_JPR.pdf http://plankt.oxfordjournals.org/content/34/5/399 https://hdl.handle.net/10013/epic.42672 https://hdl.handle.net/10013/epic.42672.d002 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
EPIC3Journal of Plankton Research, Oxford University Press, 34(5), pp. 399-415, ISSN: 0142-7873 |
op_relation |
https://epic.awi.de/id/eprint/34422/2/Goncalves-Araujo_etal_2013_JPR.pdf https://hdl.handle.net/10013/epic.42672.d002 Goncalves Araujo, R. , De Souza, M. S. , Mendes, C. R. B. , Tavano, V. M. , Pollery, R. C. and Garcia, C. A. E. (2012) Brazil-Malvinas confluence: effects of environmental variability on phytoplankton community structure , Journal of Plankton Research, 34 (5), pp. 399-415 . doi:10.1093/plankt/fbs013 <https://doi.org/10.1093/plankt%2Ffbs013> , hdl:10013/epic.42672 |
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 |
_version_ |
1766133759767216128 |