Phytoplankton biomass and production in shelf waters off NW Spain: spatial and seasonal variability in relation to upwelling

Chlorophyll-a and primary production on the euphotic zone of the N-NW Spanish shelf were studied at 125 stations between 1984 and 1992. Three geographic areas (Cantabrian Sea, Rías Altas and Was Baixas), three bathymetric ranges (20 to 60 m, 60 to 150 m and stations deeper than 200 m), and four ocea...

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Detalhes bibliográficos
Autores: Bode, Antonio, Casas, B., Fernández, E., Marañón, Emilio, Serret, P., Varela-Rodríguez, Manuel
Formato: artículo
Fecha de publicación:1996
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/316619
Acesso em linha:http://hdl.handle.net/10261/316619
Access Level:acceso abierto
Palavra-chave:Centro Oceanográfico de A Coruña
Medio Marino
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spelling Phytoplankton biomass and production in shelf waters off NW Spain: spatial and seasonal variability in relation to upwellingBode, AntonioCasas, B.Fernández, E.Marañón, EmilioSerret, P.Varela-Rodríguez, ManuelCentro Oceanográfico de A CoruñaMedio MarinoChlorophyll-a and primary production on the euphotic zone of the N-NW Spanish shelf were studied at 125 stations between 1984 and 1992. Three geographic areas (Cantabrian Sea, Rías Altas and Was Baixas), three bathymetric ranges (20 to 60 m, 60 to 150 m and stations deeper than 200 m), and four oceanographic stages (spring and autumn blooms, summer upwelling, summer stratification and winter mixing) were considered. One of the major sources of variability of chlorophyll and production data was season. Bloom and summer upwelling stages have equivalent mean and maximum values. Average chlorophyll-a concentrations approximately doubled in every step of the increasing productivity sequence: winter mixing — summer stratification — high productivity (upwelling and bloom) stages. Average primary production rates increased only 60% in the described sequence. Mean (± sd) values of chlorophyll-a and primary production rates during the high productivity stages were 59.7 ± 39.5 mg Chl-a m−2 and 86.9 ± 44.0 mg C m−2 h−1, respectively. Significant differences in both chlorophyll and primary production resulted between geographic areas in most stages. Only 27 stations showed the effects of the summer upwelling that affected coastal areas in the Cantabrian Sea and Rías Baixas shelf, but also shelf-break stations in the Rías Altas area. The Rías Baixas area had lower chlorophyll than both the Rías Altas and the Cantabrian Sea areas during spring and autumn blooms, but higher during summer upwelling events. On the contrary, primary production rates were higher in the Rías Baixas area during blooms in spring and autumn. Mid-shelf areas showed the highest chlorophyll concentrations during high productivity stages, probably due to the existence of frontal zones in all geographic areas considered. The estimated phytoplankton growth rates were comparable to those of other coastal upwelling systems, with average values lower than the maximum potential growth rates. Doubling rates for upwelling and stratification stages in the northern and Rías Altas shelf areas were equivalent, despite larger biomass accumulations during upwelling events. Low turnover rates of the existing biomass in the Rías Baixas shelf in upwelling stages suggests that the accumulation of phytoplankton was due mainly to the export from the highly productive rías, while the contribution of in situ production to these accumulations was relatively lower.Sí202320231996info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/316619reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCentro Oceanográfico de A Coruñahttps://doi.org/10.1007/BF00014687info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3166192026-05-22T06:33:51Z
dc.title.none.fl_str_mv Phytoplankton biomass and production in shelf waters off NW Spain: spatial and seasonal variability in relation to upwelling
title Phytoplankton biomass and production in shelf waters off NW Spain: spatial and seasonal variability in relation to upwelling
spellingShingle Phytoplankton biomass and production in shelf waters off NW Spain: spatial and seasonal variability in relation to upwelling
Bode, Antonio
Centro Oceanográfico de A Coruña
Medio Marino
title_short Phytoplankton biomass and production in shelf waters off NW Spain: spatial and seasonal variability in relation to upwelling
title_full Phytoplankton biomass and production in shelf waters off NW Spain: spatial and seasonal variability in relation to upwelling
title_fullStr Phytoplankton biomass and production in shelf waters off NW Spain: spatial and seasonal variability in relation to upwelling
title_full_unstemmed Phytoplankton biomass and production in shelf waters off NW Spain: spatial and seasonal variability in relation to upwelling
title_sort Phytoplankton biomass and production in shelf waters off NW Spain: spatial and seasonal variability in relation to upwelling
dc.creator.none.fl_str_mv Bode, Antonio
Casas, B.
Fernández, E.
Marañón, Emilio
Serret, P.
Varela-Rodríguez, Manuel
author Bode, Antonio
author_facet Bode, Antonio
Casas, B.
Fernández, E.
Marañón, Emilio
Serret, P.
Varela-Rodríguez, Manuel
author_role author
author2 Casas, B.
Fernández, E.
Marañón, Emilio
Serret, P.
Varela-Rodríguez, Manuel
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Centro Oceanográfico de A Coruña
Medio Marino
topic Centro Oceanográfico de A Coruña
Medio Marino
description Chlorophyll-a and primary production on the euphotic zone of the N-NW Spanish shelf were studied at 125 stations between 1984 and 1992. Three geographic areas (Cantabrian Sea, Rías Altas and Was Baixas), three bathymetric ranges (20 to 60 m, 60 to 150 m and stations deeper than 200 m), and four oceanographic stages (spring and autumn blooms, summer upwelling, summer stratification and winter mixing) were considered. One of the major sources of variability of chlorophyll and production data was season. Bloom and summer upwelling stages have equivalent mean and maximum values. Average chlorophyll-a concentrations approximately doubled in every step of the increasing productivity sequence: winter mixing — summer stratification — high productivity (upwelling and bloom) stages. Average primary production rates increased only 60% in the described sequence. Mean (± sd) values of chlorophyll-a and primary production rates during the high productivity stages were 59.7 ± 39.5 mg Chl-a m−2 and 86.9 ± 44.0 mg C m−2 h−1, respectively. Significant differences in both chlorophyll and primary production resulted between geographic areas in most stages. Only 27 stations showed the effects of the summer upwelling that affected coastal areas in the Cantabrian Sea and Rías Baixas shelf, but also shelf-break stations in the Rías Altas area. The Rías Baixas area had lower chlorophyll than both the Rías Altas and the Cantabrian Sea areas during spring and autumn blooms, but higher during summer upwelling events. On the contrary, primary production rates were higher in the Rías Baixas area during blooms in spring and autumn. Mid-shelf areas showed the highest chlorophyll concentrations during high productivity stages, probably due to the existence of frontal zones in all geographic areas considered. The estimated phytoplankton growth rates were comparable to those of other coastal upwelling systems, with average values lower than the maximum potential growth rates. Doubling rates for upwelling and stratification stages in the northern and Rías Altas shelf areas were equivalent, despite larger biomass accumulations during upwelling events. Low turnover rates of the existing biomass in the Rías Baixas shelf in upwelling stages suggests that the accumulation of phytoplankton was due mainly to the export from the highly productive rías, while the contribution of in situ production to these accumulations was relatively lower.
publishDate 1996
dc.date.none.fl_str_mv 1996
2023
2023
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/10261/316619
url http://hdl.handle.net/10261/316619
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Centro Oceanográfico de A Coruña
https://doi.org/10.1007/BF00014687
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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