Effects of water level reduction on the dynamics of phytoplankton functional groups in tropical semi-arid shallow lakes

Becker, Vanessa; Costa, Mariana Rodrigues Amaral da; Attayde, José Luiz

Effects of water level reduction on the dynamics of phytoplankton functional groups in tropical semi-arid shallow lakes

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dc.contributor.author	Becker, Vanessa
dc.contributor.author	Costa, Mariana Rodrigues Amaral da
dc.contributor.author	Attayde, José Luiz
dc.date.accessioned	2020-12-08T23:02:43Z
dc.date.available	2020-12-08T23:02:43Z
dc.date.issued	2015-12-15
dc.description.resumo	Droughts are large-scale perturbations that affect freshwater ecosystems worldwide. A water level reduction caused by drought is an important driving factor of phytoplankton dynamics. It has been suggested that a water level reduction alters the light and mixing regime and increases nutrient concentrations and phytoplankton biomass favoring cyanobacterial blooms. We took advantage of two exceptionally dry years in the Brazilian semi-arid region to investigate the effects of the water level reduction on the water quality and phytoplankton communities of two shallow man-made lakes. In both lakes, the water level was reduced by half, while the water turbidity, conductivity, and nutrient concentrations increased.In the deeper lake, the phytoplankton biomass increased and was dominated by a cyanobacteria group as expected, but it decreased in the shallower lake and was dominated by mixotrophic flagellate groups. This was because of sediment resuspension by wind and fish facilitated by a water level reduction and increased the water turbidity more strongly in the shallower than in the deeper lake. Therefore, a water level reduction caused by a drought may either increase or decrease the phytoplankton biomass and cyanobacteria dominance in tropical shallow lakes depending on the lake depth and the concentration of inorganic suspended sediments	pt_BR
dc.identifier.citation	COSTA, Mariana Rodrigues Amaral da; ATTAYDE, José Luiz; BECKER, Vanessa. Effects of water level reduction on the dynamics of phytoplankton functional groups in tropical semi-arid shallow lakes. Hydrobiologia, [S.L.], v. 778, n. 1, p. 75-89, 15 dez. 2015. Springer Science and Business Media LLC.Disponível em <https://link.springer.com/article/10.1007%2Fs10750-015-2593-6>. Acesso em 20 out 2020. http://dx.doi.org/10.1007/s10750-015-2593-6.	pt_BR
dc.identifier.doi	10.1007/s10750-015-2593-6
dc.identifier.issn	1573-5117
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30923
dc.language	en	pt_BR
dc.publisher	Springer	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Climate change	pt_BR
dc.subject	Light availability	pt_BR
dc.subject	Inorganic turbidity	pt_BR
dc.subject	Cyanobacterial blooms	pt_BR
dc.subject	Mixotrophic algae	pt_BR
dc.title	Effects of water level reduction on the dynamics of phytoplankton functional groups in tropical semi-arid shallow lakes	pt_BR
dc.type	article	pt_BR