Contrasting patterns of phytoplankton viability in the subtropical NE Atlantic ocean

The proportion of living phytoplankton cells (% LC) was quantified in natural communities along 2 transects of the subtropical NE Atlantic. The region is characterized by the dominance of nano- and micro-phytoplankton in the coastal NW African upwelling zone and pico-phytoplankton in the oligotrophi...

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Autores: Alonso-Laita, Patricia, Agustí, Susana
Tipo de recurso: artículo
Fecha de publicación:2006
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/86353
Acceso en línea:http://hdl.handle.net/10261/86353
Access Level:acceso abierto
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spelling Contrasting patterns of phytoplankton viability in the subtropical NE Atlantic oceanAlonso-Laita, PatriciaAgustí, SusanaThe proportion of living phytoplankton cells (% LC) was quantified in natural communities along 2 transects of the subtropical NE Atlantic. The region is characterized by the dominance of nano- and micro-phytoplankton in the coastal NW African upwelling zone and pico-phytoplankton in the oligotrophic open ocean. Among the pico-cyanobacteria, Synechococcus sp. % LC (40 to 100% LC) was generally higher than that observed for Prochlorococcus sp. (20 to 90% LC). The % LC values of both Prochlorococcus sp. and Synechococcus sp. were low at the oligotrophic open ocean stations and decreased towards the coastal upwelling area. Both Prochlorococcus sp. and Synechococcus sp. % LC increased in waters in which temperatures reached >21°C. The vertical variability of Prochlorococcus sp. % LC was related to the underwater visible and ultraviolet radiation, showing lower viability in the surface waters. The % LC of nano- and micro-phytoplankton varied with the trophic conditions of the waters, showing lowest values (18.6 and 11.8% LC, respectively) in the oligotrophic open ocean and highest values (98.9 and 80.0% LC, respectively) in the coastal upwelling area. However, both nano- and micro-phytoplankton viability decreased as the water temperature increased. This pattern contrasted strongly with that found for pico-cyanobacteria, indicating that the factors stressing the pico-sized and larger phytoplankton cells in the region were different. As a result of the % LC distribution of the different phytoplankton communities, the highest level of phytoplankton cell death was found in the oligotrophic area, while larger proportions of healthy, living cells were generally found in communities in the upwelling zone. The results identified cell death as an important factor structuring phytoplankton communities in the ocean. © Inter-Research 2006.Peer ReviewedInter Research2013201320062013info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/86353reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://www.int-res.com/articles/ame2006/43/a043p067.pdfinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/863532026-05-22T06:33:51Z
dc.title.none.fl_str_mv Contrasting patterns of phytoplankton viability in the subtropical NE Atlantic ocean
title Contrasting patterns of phytoplankton viability in the subtropical NE Atlantic ocean
spellingShingle Contrasting patterns of phytoplankton viability in the subtropical NE Atlantic ocean
Alonso-Laita, Patricia
title_short Contrasting patterns of phytoplankton viability in the subtropical NE Atlantic ocean
title_full Contrasting patterns of phytoplankton viability in the subtropical NE Atlantic ocean
title_fullStr Contrasting patterns of phytoplankton viability in the subtropical NE Atlantic ocean
title_full_unstemmed Contrasting patterns of phytoplankton viability in the subtropical NE Atlantic ocean
title_sort Contrasting patterns of phytoplankton viability in the subtropical NE Atlantic ocean
dc.creator.none.fl_str_mv Alonso-Laita, Patricia
Agustí, Susana
author Alonso-Laita, Patricia
author_facet Alonso-Laita, Patricia
Agustí, Susana
author_role author
author2 Agustí, Susana
author2_role author
description The proportion of living phytoplankton cells (% LC) was quantified in natural communities along 2 transects of the subtropical NE Atlantic. The region is characterized by the dominance of nano- and micro-phytoplankton in the coastal NW African upwelling zone and pico-phytoplankton in the oligotrophic open ocean. Among the pico-cyanobacteria, Synechococcus sp. % LC (40 to 100% LC) was generally higher than that observed for Prochlorococcus sp. (20 to 90% LC). The % LC values of both Prochlorococcus sp. and Synechococcus sp. were low at the oligotrophic open ocean stations and decreased towards the coastal upwelling area. Both Prochlorococcus sp. and Synechococcus sp. % LC increased in waters in which temperatures reached >21°C. The vertical variability of Prochlorococcus sp. % LC was related to the underwater visible and ultraviolet radiation, showing lower viability in the surface waters. The % LC of nano- and micro-phytoplankton varied with the trophic conditions of the waters, showing lowest values (18.6 and 11.8% LC, respectively) in the oligotrophic open ocean and highest values (98.9 and 80.0% LC, respectively) in the coastal upwelling area. However, both nano- and micro-phytoplankton viability decreased as the water temperature increased. This pattern contrasted strongly with that found for pico-cyanobacteria, indicating that the factors stressing the pico-sized and larger phytoplankton cells in the region were different. As a result of the % LC distribution of the different phytoplankton communities, the highest level of phytoplankton cell death was found in the oligotrophic area, while larger proportions of healthy, living cells were generally found in communities in the upwelling zone. The results identified cell death as an important factor structuring phytoplankton communities in the ocean. © Inter-Research 2006.
publishDate 2006
dc.date.none.fl_str_mv 2006
2013
2013
2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/86353
url http://hdl.handle.net/10261/86353
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://www.int-res.com/articles/ame2006/43/a043p067.pdf
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Inter Research
publisher.none.fl_str_mv Inter Research
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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