Extreme drought favors potential mixotrophic organisms in tropical semi-arid reservoirs

Becker, Vanessa; Costa, Mariana R. A.; Menezes, Rosemberg F.; Sarmento, Hugo; Attayde, José L.; Sternberg, Leonel da S. L.

Extreme drought favors potential mixotrophic organisms in tropical semi-arid reservoirs

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dc.contributor.author	Becker, Vanessa
dc.contributor.author	Costa, Mariana R. A.
dc.contributor.author	Menezes, Rosemberg F.
dc.contributor.author	Sarmento, Hugo
dc.contributor.author	Attayde, José L.
dc.contributor.author	Sternberg, Leonel da S. L.
dc.date.accessioned	2020-12-07T12:48:02Z
dc.date.available	2020-12-07T12:48:02Z
dc.date.issued	2018-03-16
dc.description.resumo	Climate change is affecting the global hydrological cycle and is causing drastic changes in the freshwater hydrological regime. Water level (WL) reduction caused by drought tends to increase the concentration of nutrients favoring the dominance of cyanobacteria. We hypothesized that the WL reduction favors the dominance of cyanobacteria at regular dry conditions, but at extremely dry events mixotrophic algae would thrive because of light limitation due to increased resuspension of sediments on the water column. To test our hypothesis, we compared phytoplankton traits and water quality variables between two sets of reservoirs located in two watersheds with contrasting precipitation regimes within the Brazilian semi-arid. The reservoirs were compared in a dry period and in an extremely dry period to evaluate the response of the variables to an extreme drought. Drought intensification decreased the reservoirs’ WL and water transparency and increased the total phosphorous. Cyanobacteria dominated in the dry period, and the contribution of mixotrophic algae increased in the extremely dry period. Thus, phytoplankton with mixotrophic potential was favored by the extreme drought. This result suggests that this can be one possible scenario for phytoplankton communities in reservoirs of semi-arid regions if extreme droughts become more frequent because of climate change	pt_BR
dc.identifier.citation	COSTA, Mariana R. A.; MENEZES, Rosemberg F.; SARMENTO, Hugo; ATTAYDE, José L.; STERNBERG, Leonel da S. L.; BECKER, Vanessa. Extreme drought favors potential mixotrophic organisms in tropical semi-arid reservoirs. Hydrobiologia, [S.L.], v. 831, n. 1, p. 43-54, 16 mar. 2018. Springer Science and Business Media LLC. Disponível em <https://link.springer.com/article/10.1007/s10750-018-3583-2>. Acesso em 20 out 2020. http://dx.doi.org/10.1007/s10750-018-3583-2.	pt_BR
dc.identifier.issn	1573-5117
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30847
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	Water level reduction	pt_BR
dc.subject	Water quality	pt_BR
dc.subject	Phytoplankton	pt_BR
dc.subject	Functional traits	pt_BR
dc.subject	Cyanobacteria	pt_BR
dc.title	Extreme drought favors potential mixotrophic organisms in tropical semi-arid reservoirs	pt_BR
dc.type	article	pt_BR