Diurnal changes in the bio-optical properties of the phytoplankton in the Alborán Sea (Mediterranean Sea)

The changes in the phytoplankton absorption properties during a diurnal cycle were investigated at one station located in the north-western area of the Alborán Sea. The experiment was performed in spring when the water column was strongly stratified. This hydrological situation permitted the establi...

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Autores: Mercado-Carmona, Jesús Mariano, Ramírez-Cárdenas, Teodoro, Cortés-Delgado, María Dolores, Sebastián, Marta, Reul, A., Bautista, B.
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:10261/320580
Acceso en línea:http://hdl.handle.net/10261/320580
Access Level:acceso abierto
Palabra clave:Centro Oceanográfico de Málaga
Medio Marino
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spelling Diurnal changes in the bio-optical properties of the phytoplankton in the Alborán Sea (Mediterranean Sea)Mercado-Carmona, Jesús MarianoRamírez-Cárdenas, TeodoroCortés-Delgado, María DoloresSebastián, MartaReul, A.Bautista, B.Centro Oceanográfico de MálagaMedio MarinoThe changes in the phytoplankton absorption properties during a diurnal cycle were investigated at one station located in the north-western area of the Alborán Sea. The experiment was performed in spring when the water column was strongly stratified. This hydrological situation permitted the establishment of a deep chlorophyll a (chl a) fluorescence maximum (DFM) which was located on average close to the lower limit of the mixed layer and the nutricline. The relative abundance of pico-phytoplankton (estimated as its contribution to the total chl a) was higher in the surface, however, micro-phytoplankton dominated the community at the DFM level. Chl a specific absorption coefficient (a∗(λ)) also varied with optical depth, with a∗ (the spectrally average specific absorption coefficient) decreasing by 30% at the DFM depth with respect to the surface. A significant negative correlation between the contribution of the micro-phytoplankton to the total chl a and a∗ was obtained indicating that a∗ reduction was due to changes in the packaging effect. Below the euphotic layer, a∗ increased three-fold with respect to the DFM, which agrees with the expected accumulation of accessory pigments relative to chl a as an acclimation response to the low available irradiance. The most conspicuous change during the diurnal cycle was produced in the euphotic layer where the chl a concentration decreased significantly in the afternoon (from a mean concentration of 1.1 μg L−1 to 0.7 μg L−1) and increased at dusk when it averaged 1.4 μg L−1. In addition, a∗ and the blue-to-red absorption band ratio increased in the afternoon. These results suggest that a∗(λ) diurnal variability was due to increase in photo-protective and accessory pigments relative to chl a. The variation ranges of a∗(λ) at 675 and 440 nm (the absorption peaks in the red and blue spectral bands, respectively) in the euphotic layer were 0.01–0.04 and 0.02–0.10 m2 mg−1 chl a, respectively. Approximately 30% out of this variability can be attributed to the diurnal cycle. This factor should therefore be taken into account in refining primary production models based on phytoplankton light absorption.Peer reviewedElsevierConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202320232006info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/320580reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCentro Oceanográfico de Málagahttps://doi.org/10.1016/j.ecss.2006.05.019Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3205802026-05-22T06:33:51Z
dc.title.none.fl_str_mv Diurnal changes in the bio-optical properties of the phytoplankton in the Alborán Sea (Mediterranean Sea)
title Diurnal changes in the bio-optical properties of the phytoplankton in the Alborán Sea (Mediterranean Sea)
spellingShingle Diurnal changes in the bio-optical properties of the phytoplankton in the Alborán Sea (Mediterranean Sea)
Mercado-Carmona, Jesús Mariano
Centro Oceanográfico de Málaga
Medio Marino
title_short Diurnal changes in the bio-optical properties of the phytoplankton in the Alborán Sea (Mediterranean Sea)
title_full Diurnal changes in the bio-optical properties of the phytoplankton in the Alborán Sea (Mediterranean Sea)
title_fullStr Diurnal changes in the bio-optical properties of the phytoplankton in the Alborán Sea (Mediterranean Sea)
title_full_unstemmed Diurnal changes in the bio-optical properties of the phytoplankton in the Alborán Sea (Mediterranean Sea)
title_sort Diurnal changes in the bio-optical properties of the phytoplankton in the Alborán Sea (Mediterranean Sea)
dc.creator.none.fl_str_mv Mercado-Carmona, Jesús Mariano
Ramírez-Cárdenas, Teodoro
Cortés-Delgado, María Dolores
Sebastián, Marta
Reul, A.
Bautista, B.
author Mercado-Carmona, Jesús Mariano
author_facet Mercado-Carmona, Jesús Mariano
Ramírez-Cárdenas, Teodoro
Cortés-Delgado, María Dolores
Sebastián, Marta
Reul, A.
Bautista, B.
author_role author
author2 Ramírez-Cárdenas, Teodoro
Cortés-Delgado, María Dolores
Sebastián, Marta
Reul, A.
Bautista, B.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Centro Oceanográfico de Málaga
Medio Marino
topic Centro Oceanográfico de Málaga
Medio Marino
description The changes in the phytoplankton absorption properties during a diurnal cycle were investigated at one station located in the north-western area of the Alborán Sea. The experiment was performed in spring when the water column was strongly stratified. This hydrological situation permitted the establishment of a deep chlorophyll a (chl a) fluorescence maximum (DFM) which was located on average close to the lower limit of the mixed layer and the nutricline. The relative abundance of pico-phytoplankton (estimated as its contribution to the total chl a) was higher in the surface, however, micro-phytoplankton dominated the community at the DFM level. Chl a specific absorption coefficient (a∗(λ)) also varied with optical depth, with a∗ (the spectrally average specific absorption coefficient) decreasing by 30% at the DFM depth with respect to the surface. A significant negative correlation between the contribution of the micro-phytoplankton to the total chl a and a∗ was obtained indicating that a∗ reduction was due to changes in the packaging effect. Below the euphotic layer, a∗ increased three-fold with respect to the DFM, which agrees with the expected accumulation of accessory pigments relative to chl a as an acclimation response to the low available irradiance. The most conspicuous change during the diurnal cycle was produced in the euphotic layer where the chl a concentration decreased significantly in the afternoon (from a mean concentration of 1.1 μg L−1 to 0.7 μg L−1) and increased at dusk when it averaged 1.4 μg L−1. In addition, a∗ and the blue-to-red absorption band ratio increased in the afternoon. These results suggest that a∗(λ) diurnal variability was due to increase in photo-protective and accessory pigments relative to chl a. The variation ranges of a∗(λ) at 675 and 440 nm (the absorption peaks in the red and blue spectral bands, respectively) in the euphotic layer were 0.01–0.04 and 0.02–0.10 m2 mg−1 chl a, respectively. Approximately 30% out of this variability can be attributed to the diurnal cycle. This factor should therefore be taken into account in refining primary production models based on phytoplankton light absorption.
publishDate 2006
dc.date.none.fl_str_mv 2006
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/10261/320580
url http://hdl.handle.net/10261/320580
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Centro Oceanográfico de Málaga
https://doi.org/10.1016/j.ecss.2006.05.019
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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 15,81155

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