Alexandrium catenella and Alexandrium minutum blooms in the Mediterranean Sea: Toward the identification of ecological niches.

Annual recurrent blooms of the toxic dinoflagellates Alexandrium catenella and Alexandrium minutum were detected from 2000 to 2003 in harbours along the Catalan coast. The interrelation study between the occurrence of the blooms and specific external conditions at the study sites demonstrated that d...

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Detalhes bibliográficos
Autores: Bravo, Isabel, Vila, Magda, Masó, Mercedes, Ramilo-Rivero, María Isabel, Figueroa, Rosa Isabel
Tipo de documento: artigo
Data de publicação:2008
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/323517
Acesso em linha:http://hdl.handle.net/10261/323517
Access Level:Acceso aberto
Palavra-chave:Centro Oceanográfico de Vigo
Medio Marino
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spelling Alexandrium catenella and Alexandrium minutum blooms in the Mediterranean Sea: Toward the identification of ecological niches.Bravo, IsabelVila, MagdaMasó, MercedesRamilo-Rivero, María IsabelFigueroa, Rosa IsabelCentro Oceanográfico de VigoMedio MarinoAnnual recurrent blooms of the toxic dinoflagellates Alexandrium catenella and Alexandrium minutum were detected from 2000 to 2003 in harbours along the Catalan coast. The interrelation study between the occurrence of the blooms and specific external conditions at the study sites demonstrated that different factors are required for the bloom of each Alexandrium species. Concentrations higher than 105 cells l−1 of A. catenella were only detected in Tarragona harbour. These blooms were associated with water surface temperature between 21 and 25 °C and salinities of around 34 psu or higher than 37 psu. A. minutum appeared widely spread along the Catalan coast, though the most intensive and recurrent blooms of this species were observed in Arenys de Mar harbour. Concentrations of millions of cells per litre of A. minutum were associated with water temperatures below 14 °C and salinities of around 34–36 psu. A. minutum cell densities showed a positive significant correlation with NO3 but a negative correlation with NH4. On the other hand, A. catenella blooms dominated when both NO3 and NH4 levels were high. The prevailing inorganic nitrogen form (NO3 vs. NH4) could explain why these two species rarely coincide in the same harbours. Accumulation of cysts in the sediment was found to be an important potential factor for the recurrence of these species. The 4.3 × 103 A. catenella cysts cm−3 of wet sediment in Tarragona harbour and the 3.02 × 103 A. minutum cysts cm−3 of wet sediment in Vilanova harbour were the highest concentrations observed from the cyst study. Confined waters such as harbours play an important role as reservoirs for the accumulation of cysts and vegetative cells, which contributes to the expansion of these dinoflagellates in the region. However, the particular environmental conditions are also decisive factors of bloom intensity.No202320232008info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/323517reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCentro Oceanográfico de Vigohttps://www.sciencedirect.com/science/article/pii/S1568988307001746info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3235172026-05-22T06:33:51Z
dc.title.none.fl_str_mv Alexandrium catenella and Alexandrium minutum blooms in the Mediterranean Sea: Toward the identification of ecological niches.
title Alexandrium catenella and Alexandrium minutum blooms in the Mediterranean Sea: Toward the identification of ecological niches.
spellingShingle Alexandrium catenella and Alexandrium minutum blooms in the Mediterranean Sea: Toward the identification of ecological niches.
Bravo, Isabel
Centro Oceanográfico de Vigo
Medio Marino
title_short Alexandrium catenella and Alexandrium minutum blooms in the Mediterranean Sea: Toward the identification of ecological niches.
title_full Alexandrium catenella and Alexandrium minutum blooms in the Mediterranean Sea: Toward the identification of ecological niches.
title_fullStr Alexandrium catenella and Alexandrium minutum blooms in the Mediterranean Sea: Toward the identification of ecological niches.
title_full_unstemmed Alexandrium catenella and Alexandrium minutum blooms in the Mediterranean Sea: Toward the identification of ecological niches.
title_sort Alexandrium catenella and Alexandrium minutum blooms in the Mediterranean Sea: Toward the identification of ecological niches.
dc.creator.none.fl_str_mv Bravo, Isabel
Vila, Magda
Masó, Mercedes
Ramilo-Rivero, María Isabel
Figueroa, Rosa Isabel
author Bravo, Isabel
author_facet Bravo, Isabel
Vila, Magda
Masó, Mercedes
Ramilo-Rivero, María Isabel
Figueroa, Rosa Isabel
author_role author
author2 Vila, Magda
Masó, Mercedes
Ramilo-Rivero, María Isabel
Figueroa, Rosa Isabel
author2_role author
author
author
author
dc.subject.none.fl_str_mv Centro Oceanográfico de Vigo
Medio Marino
topic Centro Oceanográfico de Vigo
Medio Marino
description Annual recurrent blooms of the toxic dinoflagellates Alexandrium catenella and Alexandrium minutum were detected from 2000 to 2003 in harbours along the Catalan coast. The interrelation study between the occurrence of the blooms and specific external conditions at the study sites demonstrated that different factors are required for the bloom of each Alexandrium species. Concentrations higher than 105 cells l−1 of A. catenella were only detected in Tarragona harbour. These blooms were associated with water surface temperature between 21 and 25 °C and salinities of around 34 psu or higher than 37 psu. A. minutum appeared widely spread along the Catalan coast, though the most intensive and recurrent blooms of this species were observed in Arenys de Mar harbour. Concentrations of millions of cells per litre of A. minutum were associated with water temperatures below 14 °C and salinities of around 34–36 psu. A. minutum cell densities showed a positive significant correlation with NO3 but a negative correlation with NH4. On the other hand, A. catenella blooms dominated when both NO3 and NH4 levels were high. The prevailing inorganic nitrogen form (NO3 vs. NH4) could explain why these two species rarely coincide in the same harbours. Accumulation of cysts in the sediment was found to be an important potential factor for the recurrence of these species. The 4.3 × 103 A. catenella cysts cm−3 of wet sediment in Tarragona harbour and the 3.02 × 103 A. minutum cysts cm−3 of wet sediment in Vilanova harbour were the highest concentrations observed from the cyst study. Confined waters such as harbours play an important role as reservoirs for the accumulation of cysts and vegetative cells, which contributes to the expansion of these dinoflagellates in the region. However, the particular environmental conditions are also decisive factors of bloom intensity.
publishDate 2008
dc.date.none.fl_str_mv 2008
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/10261/323517
url http://hdl.handle.net/10261/323517
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Centro Oceanográfico de Vigo
https://www.sciencedirect.com/science/article/pii/S1568988307001746
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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