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Hydrobiologia

, Volume 831, Issue 1, pp 43–54 | Cite as

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

  • Mariana R. A. CostaEmail author
  • Rosemberg F. Menezes
  • Hugo Sarmento
  • José L. Attayde
  • Leonel da S. L. Sternberg
  • Vanessa Becker
PHYTOPLANKTON & BIOTIC INTERACTIONS

Abstract

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.

Keywords

Climate change Water level reduction Water quality Phytoplankton Functional traits Cyanobacteria 

Notes

Acknowledgements

This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (Process Numbers: 442484/2014-3/MCTI/CNPq/Universal 14/2014 and 446138/2015-0/MCTI/CNPq/ANA/N°23/2015) and Process Numbers 407783/2016-4 CNPq/Universal, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES/PNPD–Project N°: 2304/2011), Fundação de Pesquisa de São Paulo (FAPESP) (Processes: 2014/14139-3 and 2016/50494-8). We are grateful to CAPES for granting the Ph.D. scholarship (M.R.A. Costa). We also thank the many people who helped during the field work and laboratory analysis, especially Edson Santana, Bruno Wanderley, Anízio Souza, Carlos Alberto Rocha-Júnior, Juliana Leroy, Regina Nobre, Pedro Junger, Bruno Wanderley, Lenice Ventura, Bárbara Bezerra, Cleto Freire and Isaac Falcão.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Mariana R. A. Costa
    • 1
    Email author
  • Rosemberg F. Menezes
    • 2
    • 3
  • Hugo Sarmento
    • 4
  • José L. Attayde
    • 2
  • Leonel da S. L. Sternberg
    • 5
  • Vanessa Becker
    • 1
    • 6
  1. 1.Programa de Pós-Graduação Em EcologiaUniversidade Federal do Rio Grande do Norte (UFRN)NatalBrazil
  2. 2.Departamento de EcologiaUniversidade Federal do Rio Grande do Norte (UFRN)NatalBrazil
  3. 3.Departamento de Fitotecnia e Ciências AmbientaisUniversidade Federal da Paraíba (UFPB)AreiaBrazil
  4. 4.Departamento de HidrobiologiaUniversidade Federal de São Carlos (UFSCar)São CarlosBrazil
  5. 5.Department of BiologyUniversity of MiamiCoral GablesUSA
  6. 6.Departamento de Engenharia CivilUniversidade Federal do Rio Grande do Norte (UFRN)NatalBrazil

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