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Open AccessArticle

Unraveling Flooding Dynamics and Nutrients’ Controls upon Phytoplankton Functional Dynamics in Amazonian Floodplain Lakes

1
Environmental Science Post Graduate Program, Universidade de Brasília (UnB), Campus FUP-Planaltina, área Universitária 1, Vila Nossa Senhora de Fátima, CEP 73.340-710 Planaltina, Brazil
2
Joint International Laboratory LMI OCE “Observatory of Environmental Change”, UnB/IRD, Instituto de Geociências, Universidade de Brasília (UnB), Campus Universtitário Darcy Ribeiro, ICC-Ala Central, Caixa posta 04465, CEP 70919-970, Brasilia, Brazil
3
UMR 228 Espace-DEV, Institut de Recherche pour le Développement (IRD), 13001 Marseille, France
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Environmental Science Post Graduate Program, Universidade Federal de Goiás (UFG), 74690-900 Goiania, Brazil
5
Institute of Hydraulic Research (IPH), Universidade Federal do Rio Grande do Sul (UFRGS), 90040-060 Porto Alegre, Brazil
*
Author to whom correspondence should be addressed.
Water 2019, 11(1), 154; https://doi.org/10.3390/w11010154
Received: 2 November 2018 / Revised: 20 December 2018 / Accepted: 25 December 2018 / Published: 16 January 2019
(This article belongs to the Section Water Quality and Ecosystems)
The processes in tropical floodplain lakes enable maintaining phytoplankton nutrient requirements over a hydrological year. The nutrients such as nitrogen, phosphorus and carbon compounds play an essential role in phytoplankton growth. However, the way that nutrients and phytoplankton interact and how this relationship varies seasonally in tropical freshwater ecosystems is not clear. In this study, we evaluate the relationship between phytoplankton–nutrients over the hydrological cycle in Amazonian floodplain lakes and verify if this relationship influences the biomass of cyanobacteria. We also check what factors linked to nutrients act in structuring phytoplankton community. Using the phytoplankton functional approach, we verified how their ability to respond to hydrological and environmental variations reflects the ecological conditions and investigated how these interactions work. The results show that the Amazonian floodplain lakes could maintain long-term nutrient enrichment status. The nutrients input conduces to cyanobacteria dominance, that allied to other factors, play an essential role in supporting the stability of the phytoplankton–nutrients relationship over the hydrological cycle. View Full-Text
Keywords: nutrient enrichment; floodplain dynamics; phytoplankton ecology; hydrological process nutrient enrichment; floodplain dynamics; phytoplankton ecology; hydrological process
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Kraus, C.N.; Bonnet, M.-P.; de Souza Nogueira, I.; Morais Pereira Souza Lobo, M.T.; da Motta Marques, D.; Garnier, J.; Cardoso Galli Vieira, L. Unraveling Flooding Dynamics and Nutrients’ Controls upon Phytoplankton Functional Dynamics in Amazonian Floodplain Lakes. Water 2019, 11, 154.

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