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

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

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dc.contributor.author	Becker, Vanessa
dc.contributor.author	Caputo, Luciano
dc.contributor.author	Ordóñez, Jaime
dc.contributor.author	Marcé, Rafael
dc.contributor.author	Armengol, Joan
dc.contributor.author	Crossetti, Luciane O.
dc.contributor.author	Huszar, Vera L. M.
dc.date.accessioned	2020-12-08T23:34:55Z
dc.date.available	2020-12-08T23:34:55Z
dc.date.issued	2010-03-20
dc.description.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	pt_BR
dc.identifier.citation	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	pt_BR
dc.identifier.doi	10.1016/j.watres.2010.03.018
dc.identifier.issn	0043-1354
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30935
dc.language	en	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Water-supply reservoir	pt_BR
dc.subject	Thermal stratification	pt_BR
dc.subject	Phytoplankton dynamics	pt_BR
dc.subject	Assemblage index	pt_BR
dc.subject	Nutrient limitation	pt_BR
dc.subject	Functional groups	pt_BR
dc.title	Driving factors of the phytoplankton functional groups in a deep Mediterranean reservoir	pt_BR
dc.type	article	pt_BR