Influence of upwelling and river runoff interaction on phytoplankton assemblages in a Middle Galician Ria and comparison with northern and southern rias (NW Iberian Peninsula)

The first oceanographic research (hydrography, nutrient salts, chlorophyll, primary production and phytoplankton assemblages) in a Middle Galician Ria was carried out in Corme-Laxe during 2001, just a year before the Prestige oil spill, being the only reference to evaluate eventual changes in the ph...

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Autores: Varela-Rodríguez, Manuel, Prego, Ricardo, Pazos, Yolanda, Moroño, Ángeles
Tipo de recurso: artículo
Fecha de publicación:2005
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/316525
Acceso en línea:http://hdl.handle.net/10261/316525
Access Level:acceso abierto
Palabra clave:Medio Marino
Centro Oceanográfico de A Coruña
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spelling Influence of upwelling and river runoff interaction on phytoplankton assemblages in a Middle Galician Ria and comparison with northern and southern rias (NW Iberian Peninsula)Varela-Rodríguez, ManuelPrego, RicardoPazos, YolandaMoroño, ÁngelesMedio MarinoCentro Oceanográfico de A CoruñaThe first oceanographic research (hydrography, nutrient salts, chlorophyll, primary production and phytoplankton assemblages) in a Middle Galician Ria was carried out in Corme-Laxe during 2001, just a year before the Prestige oil spill, being the only reference to evaluate eventual changes in the phytoplankton community. Due to the small size of this ria (6.5 km2), oceanographic processes were driven by the continental water supplied by Anllons River during the wet season (20–30 m3 s−1 in winter), and the strong oceanic influence from the nearby shelf during the dry season. The annual cycle showed a spring bloom with high levels of chlorophyll (up to 14 μg Chl-a L−1) and primary production (3 g C m−2 d−1) and a summer upwelling bloom (up to 8 μg Chl-a L−1 and 10 g C m−2 d−1) where the proximity of the Galician upwelling core (<13.5 °C at sea surface) favors the input of upwelled seawater (up to 9 μM of nitrate and silicate) to the bottom ria layer, even during summer stratification events (primary production around 2 g C m−2 d−1). Thus, phytoplankton assemblages form a “continuum” from spring to autumn with a predominance of diatoms and overlapping species between consecutive periods; only in autumn dinoflagellates and flagellates characterized the phytoplankton community. In the Middle Rias as Corme-Laxe, the nutrient values, Chl-a, primary production and phytoplankton abundance for productive periods were higher than those reported for the Northern (Ria of A Coruña) and Southern Rias (Ria of Arousa) for year 2001; this suggests the importance of the hydrographic events occurring in the zone of maximum upwelling intensity of the Western Iberian Shelf, where a lack of annual cycles studies exists.No202320232005info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/316525reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCentro Oceanográfico de A Coruñahttps://www.sciencedirect.com/science/article/pii/S0272771405001435info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3165252026-05-22T06:33:51Z
dc.title.none.fl_str_mv Influence of upwelling and river runoff interaction on phytoplankton assemblages in a Middle Galician Ria and comparison with northern and southern rias (NW Iberian Peninsula)
title Influence of upwelling and river runoff interaction on phytoplankton assemblages in a Middle Galician Ria and comparison with northern and southern rias (NW Iberian Peninsula)
spellingShingle Influence of upwelling and river runoff interaction on phytoplankton assemblages in a Middle Galician Ria and comparison with northern and southern rias (NW Iberian Peninsula)
Varela-Rodríguez, Manuel
Medio Marino
Centro Oceanográfico de A Coruña
title_short Influence of upwelling and river runoff interaction on phytoplankton assemblages in a Middle Galician Ria and comparison with northern and southern rias (NW Iberian Peninsula)
title_full Influence of upwelling and river runoff interaction on phytoplankton assemblages in a Middle Galician Ria and comparison with northern and southern rias (NW Iberian Peninsula)
title_fullStr Influence of upwelling and river runoff interaction on phytoplankton assemblages in a Middle Galician Ria and comparison with northern and southern rias (NW Iberian Peninsula)
title_full_unstemmed Influence of upwelling and river runoff interaction on phytoplankton assemblages in a Middle Galician Ria and comparison with northern and southern rias (NW Iberian Peninsula)
title_sort Influence of upwelling and river runoff interaction on phytoplankton assemblages in a Middle Galician Ria and comparison with northern and southern rias (NW Iberian Peninsula)
dc.creator.none.fl_str_mv Varela-Rodríguez, Manuel
Prego, Ricardo
Pazos, Yolanda
Moroño, Ángeles
author Varela-Rodríguez, Manuel
author_facet Varela-Rodríguez, Manuel
Prego, Ricardo
Pazos, Yolanda
Moroño, Ángeles
author_role author
author2 Prego, Ricardo
Pazos, Yolanda
Moroño, Ángeles
author2_role author
author
author
dc.subject.none.fl_str_mv Medio Marino
Centro Oceanográfico de A Coruña
topic Medio Marino
Centro Oceanográfico de A Coruña
description The first oceanographic research (hydrography, nutrient salts, chlorophyll, primary production and phytoplankton assemblages) in a Middle Galician Ria was carried out in Corme-Laxe during 2001, just a year before the Prestige oil spill, being the only reference to evaluate eventual changes in the phytoplankton community. Due to the small size of this ria (6.5 km2), oceanographic processes were driven by the continental water supplied by Anllons River during the wet season (20–30 m3 s−1 in winter), and the strong oceanic influence from the nearby shelf during the dry season. The annual cycle showed a spring bloom with high levels of chlorophyll (up to 14 μg Chl-a L−1) and primary production (3 g C m−2 d−1) and a summer upwelling bloom (up to 8 μg Chl-a L−1 and 10 g C m−2 d−1) where the proximity of the Galician upwelling core (<13.5 °C at sea surface) favors the input of upwelled seawater (up to 9 μM of nitrate and silicate) to the bottom ria layer, even during summer stratification events (primary production around 2 g C m−2 d−1). Thus, phytoplankton assemblages form a “continuum” from spring to autumn with a predominance of diatoms and overlapping species between consecutive periods; only in autumn dinoflagellates and flagellates characterized the phytoplankton community. In the Middle Rias as Corme-Laxe, the nutrient values, Chl-a, primary production and phytoplankton abundance for productive periods were higher than those reported for the Northern (Ria of A Coruña) and Southern Rias (Ria of Arousa) for year 2001; this suggests the importance of the hydrographic events occurring in the zone of maximum upwelling intensity of the Western Iberian Shelf, where a lack of annual cycles studies exists.
publishDate 2005
dc.date.none.fl_str_mv 2005
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/10261/316525
url http://hdl.handle.net/10261/316525
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Centro Oceanográfico de A Coruña
https://www.sciencedirect.com/science/article/pii/S0272771405001435
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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