Influence of water volume reduction on the phytoplankton dynamics in a semi-arid man-made lake: A comparison of two morphofunctional approaches

Influence of water volume reduction on the phytoplankton dynamics in a semi-arid man-made lake: A comparison of two morphofunctional approaches

Significant reductions in the water levels of lakes are influenced by droughts and freshwater demands, especially in semi-arid regions, where hydric stress is greater. The aim of this study was to investigate the dynamics of phytoplankton during two different water volume periods resulting from an e...

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Bibliographic Details
Published in:Anais da Academia Brasileira de Ciências Vol. 92; no. 1; p. e20181102
Main Authors: Braga, Gustavo G, Becker, Vanessa
Format: Journal Article
Language:English
Published: Brazil Academia Brasileira de Ciências 01-01-2020
Subjects:
Biomass
Brazil
cyanobacteria
Cyanobacteria - growth & development
Environmental Monitoring
eutrophication
hydric deficit
Lakes - analysis
Lakes - chemistry
Morphology-Based Functional Groups
MULTIDISCIPLINARY SCIENCES
Phytoplankton - growth & development
Population Dynamics
Reynolds Functional Groups
Seasons
Brazil
Reynolds Functional Groups
Morphology-Based Functional Groups
hydric deficit
eutrophication
cyanobacteria
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Summary:Significant reductions in the water levels of lakes are influenced by droughts and freshwater demands, especially in semi-arid regions, where hydric stress is greater. The aim of this study was to investigate the dynamics of phytoplankton during two different water volume periods resulting from an extended drought in a semi-arid lake. Another objective was to compare two functional approaches to test which one of these best captures phytoplankton variability as a function of environmental variability. Multivariate analyses performed using the Reynolds Functional Groups (RFG) and Morphology-Based Functional Groups (MBFG) classification schemes indicated two periods, high and a low water volume. The results demonstrated the importance of light availability on phytoplankton assemblages as these two periods showed significant differences in water transparency and phytoplankton composition. During extended droughts the reduction in water volume enhances the development of bloom-forming cyanobacteria through the limitation of light in a eutrophic man-made lake. Moreover, both functional traits approaches demonstrated the effect of light availability on phytoplankton assemblage composition and can be applied in similar systems. However, the RFG classification provides more information and allows a more detailed description of the algal assemblages.
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ISSN:0001-3765
1678-2690
1678-2690
DOI:10.1590/0001-3765202020181102