Driving factors of the phytoplankton functional groups in a deep Mediterranean reservoir

Detalhes bibliográficos
Autor(a) principal: Becker, Vanessa
Data de Publicação: 2010
Outros Autores: Caputo, Luciano, Ordóñez, Jaime, Marcé, Rafael, Armengol, Joan, Crossetti, Luciane O., Huszar, Vera L. M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRN
Texto Completo: https://repositorio.ufrn.br/handle/123456789/30935
Resumo: The control of phytoplankton growth is mainly related to the availability of light and nutrients. Both may select phytoplankton species, but only if they occur in limiting amounts. During the last decade, the functional groups approach, based on the physiological, morphological and ecological attributes of the species, has proved to be a more efficient way to analyze seasonal changes in phytoplankton biomass. We analysed the dynamics of the phytoplankton functional groups sensu Reynolds, recognising the driving forces (light, mixing regime, and nutrients) in the Sau Reservoir, based on a oneeyear cycle (monthly surface-water sampling). The Sau Reservoir is a Mediterranean water-supply reservoir with a canyon-shaped basin and a clear and mixed epilimnion layer. The long stratification period and high light availability led to high phytoplankton biomass (110.8 fresh-weight mg L 1) in the epilimnion during summer. The reservoir showed P-limitation for phytoplankton growth in this period. All functional groups included one or more species (X2-Rhodomonas spp.; Y-Cryptomonas spp.; F-Oocystis lacustris; K-Aphanocapsa spp.) selected by resources, especially phosphorus. Species of Cryptomonas (group Y) dominated during the mixing period (winter season) in conditions of low light and relatively high availability of dissolved nutrients. Increases in water-column stability during spring stratification led to phytoplankton biomass increases due to the dominance of small flagellate functional groups (X2 and X3, chrysophyceans). The colonial chlorophycean O. lacustris (group F) peaked during the mid-summer stratification, when the mixed epilimnion was clearly depleted in nutrients, especially SRP. High temperature and increases in nutrient concentration during the end-summer and mid-autumn resulted in a decrease of green algae (group F) and increase of Aphanocapsa spp. (cyanobacteria, group K) and dinoflagellates (group Lo). The study also revealed the important role of physical processes in the seasonal gradient, in selecting phytoplankton functional groups, and consequently in the assessment of ecological status. The Q index (assemblage index) based on functional groups indicated the overall good ecological status of the Sau Reservoir, which varied as a function of the mixing regime. This is the first application of the Assemblage Index to a European water-supply reservoir
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spelling Becker, VanessaCaputo, LucianoOrdóñez, JaimeMarcé, RafaelArmengol, JoanCrossetti, Luciane O.Huszar, Vera L. M.2020-12-08T23:34:55Z2020-12-08T23:34:55Z2010-03-20BECKER, Vanessa; CAPUTO, Luciano; ORDÓÑEZ, Jaime; MARCÉ, Rafael; ARMENGOL, Joan; CROSSETTI, Luciane O.; HUSZAR, Vera L.M. Driving factors of the phytoplankton functional groups in a deep Mediterranean reservoir. Water Research, [S.l.], v. 44, n. 11, p. 3345-3354, jun. 2010. Elsevier. Disponível em https://www.sciencedirect.com/science/article/pii/S0043135410001910?via%3Dihub. Acesso em 20 out. 2020. http://dx.doi.org/10.1016/j.watres.2010.03.0180043-1354https://repositorio.ufrn.br/handle/123456789/3093510.1016/j.watres.2010.03.018ElsevierAttribution 3.0 Brazilhttp://creativecommons.org/licenses/by/3.0/br/info:eu-repo/semantics/openAccessWater-supply reservoirThermal stratificationPhytoplankton dynamicsAssemblage indexNutrient limitationFunctional groupsDriving factors of the phytoplankton functional groups in a deep Mediterranean reservoirinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleThe control of phytoplankton growth is mainly related to the availability of light and nutrients. Both may select phytoplankton species, but only if they occur in limiting amounts. During the last decade, the functional groups approach, based on the physiological, morphological and ecological attributes of the species, has proved to be a more efficient way to analyze seasonal changes in phytoplankton biomass. We analysed the dynamics of the phytoplankton functional groups sensu Reynolds, recognising the driving forces (light, mixing regime, and nutrients) in the Sau Reservoir, based on a oneeyear cycle (monthly surface-water sampling). The Sau Reservoir is a Mediterranean water-supply reservoir with a canyon-shaped basin and a clear and mixed epilimnion layer. The long stratification period and high light availability led to high phytoplankton biomass (110.8 fresh-weight mg L 1) in the epilimnion during summer. The reservoir showed P-limitation for phytoplankton growth in this period. All functional groups included one or more species (X2-Rhodomonas spp.; Y-Cryptomonas spp.; F-Oocystis lacustris; K-Aphanocapsa spp.) selected by resources, especially phosphorus. Species of Cryptomonas (group Y) dominated during the mixing period (winter season) in conditions of low light and relatively high availability of dissolved nutrients. Increases in water-column stability during spring stratification led to phytoplankton biomass increases due to the dominance of small flagellate functional groups (X2 and X3, chrysophyceans). The colonial chlorophycean O. lacustris (group F) peaked during the mid-summer stratification, when the mixed epilimnion was clearly depleted in nutrients, especially SRP. High temperature and increases in nutrient concentration during the end-summer and mid-autumn resulted in a decrease of green algae (group F) and increase of Aphanocapsa spp. (cyanobacteria, group K) and dinoflagellates (group Lo). The study also revealed the important role of physical processes in the seasonal gradient, in selecting phytoplankton functional groups, and consequently in the assessment of ecological status. The Q index (assemblage index) based on functional groups indicated the overall good ecological status of the Sau Reservoir, which varied as a function of the mixing regime. 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dc.title.pt_BR.fl_str_mv Driving factors of the phytoplankton functional groups in a deep Mediterranean reservoir
title Driving factors of the phytoplankton functional groups in a deep Mediterranean reservoir
spellingShingle Driving factors of the phytoplankton functional groups in a deep Mediterranean reservoir
Becker, Vanessa
Water-supply reservoir
Thermal stratification
Phytoplankton dynamics
Assemblage index
Nutrient limitation
Functional groups
title_short Driving factors of the phytoplankton functional groups in a deep Mediterranean reservoir
title_full Driving factors of the phytoplankton functional groups in a deep Mediterranean reservoir
title_fullStr Driving factors of the phytoplankton functional groups in a deep Mediterranean reservoir
title_full_unstemmed Driving factors of the phytoplankton functional groups in a deep Mediterranean reservoir
title_sort Driving factors of the phytoplankton functional groups in a deep Mediterranean reservoir
author Becker, Vanessa
author_facet Becker, Vanessa
Caputo, Luciano
Ordóñez, Jaime
Marcé, Rafael
Armengol, Joan
Crossetti, Luciane O.
Huszar, Vera L. M.
author_role author
author2 Caputo, Luciano
Ordóñez, Jaime
Marcé, Rafael
Armengol, Joan
Crossetti, Luciane O.
Huszar, Vera L. M.
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Becker, Vanessa
Caputo, Luciano
Ordóñez, Jaime
Marcé, Rafael
Armengol, Joan
Crossetti, Luciane O.
Huszar, Vera L. M.
dc.subject.por.fl_str_mv Water-supply reservoir
Thermal stratification
Phytoplankton dynamics
Assemblage index
Nutrient limitation
Functional groups
topic Water-supply reservoir
Thermal stratification
Phytoplankton dynamics
Assemblage index
Nutrient limitation
Functional groups
description The control of phytoplankton growth is mainly related to the availability of light and nutrients. Both may select phytoplankton species, but only if they occur in limiting amounts. During the last decade, the functional groups approach, based on the physiological, morphological and ecological attributes of the species, has proved to be a more efficient way to analyze seasonal changes in phytoplankton biomass. We analysed the dynamics of the phytoplankton functional groups sensu Reynolds, recognising the driving forces (light, mixing regime, and nutrients) in the Sau Reservoir, based on a oneeyear cycle (monthly surface-water sampling). The Sau Reservoir is a Mediterranean water-supply reservoir with a canyon-shaped basin and a clear and mixed epilimnion layer. The long stratification period and high light availability led to high phytoplankton biomass (110.8 fresh-weight mg L 1) in the epilimnion during summer. The reservoir showed P-limitation for phytoplankton growth in this period. All functional groups included one or more species (X2-Rhodomonas spp.; Y-Cryptomonas spp.; F-Oocystis lacustris; K-Aphanocapsa spp.) selected by resources, especially phosphorus. Species of Cryptomonas (group Y) dominated during the mixing period (winter season) in conditions of low light and relatively high availability of dissolved nutrients. Increases in water-column stability during spring stratification led to phytoplankton biomass increases due to the dominance of small flagellate functional groups (X2 and X3, chrysophyceans). The colonial chlorophycean O. lacustris (group F) peaked during the mid-summer stratification, when the mixed epilimnion was clearly depleted in nutrients, especially SRP. High temperature and increases in nutrient concentration during the end-summer and mid-autumn resulted in a decrease of green algae (group F) and increase of Aphanocapsa spp. (cyanobacteria, group K) and dinoflagellates (group Lo). The study also revealed the important role of physical processes in the seasonal gradient, in selecting phytoplankton functional groups, and consequently in the assessment of ecological status. The Q index (assemblage index) based on functional groups indicated the overall good ecological status of the Sau Reservoir, which varied as a function of the mixing regime. This is the first application of the Assemblage Index to a European water-supply reservoir
publishDate 2010
dc.date.issued.fl_str_mv 2010-03-20
dc.date.accessioned.fl_str_mv 2020-12-08T23:34:55Z
dc.date.available.fl_str_mv 2020-12-08T23:34:55Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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dc.identifier.citation.fl_str_mv BECKER, Vanessa; CAPUTO, Luciano; ORDÓÑEZ, Jaime; MARCÉ, Rafael; ARMENGOL, Joan; CROSSETTI, Luciane O.; HUSZAR, Vera L.M. Driving factors of the phytoplankton functional groups in a deep Mediterranean reservoir. Water Research, [S.l.], v. 44, n. 11, p. 3345-3354, jun. 2010. Elsevier. Disponível em https://www.sciencedirect.com/science/article/pii/S0043135410001910?via%3Dihub. Acesso em 20 out. 2020. http://dx.doi.org/10.1016/j.watres.2010.03.018
dc.identifier.uri.fl_str_mv https://repositorio.ufrn.br/handle/123456789/30935
dc.identifier.issn.none.fl_str_mv 0043-1354
dc.identifier.doi.none.fl_str_mv 10.1016/j.watres.2010.03.018
identifier_str_mv BECKER, Vanessa; CAPUTO, Luciano; ORDÓÑEZ, Jaime; MARCÉ, Rafael; ARMENGOL, Joan; CROSSETTI, Luciane O.; HUSZAR, Vera L.M. Driving factors of the phytoplankton functional groups in a deep Mediterranean reservoir. Water Research, [S.l.], v. 44, n. 11, p. 3345-3354, jun. 2010. Elsevier. Disponível em https://www.sciencedirect.com/science/article/pii/S0043135410001910?via%3Dihub. Acesso em 20 out. 2020. http://dx.doi.org/10.1016/j.watres.2010.03.018
0043-1354
10.1016/j.watres.2010.03.018
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