The phytoplankton community as a descriptor of environmental variability: a case study in five reservoirs of the Paraná river basin
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2022
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Resumo
We aimed to characterize the structure of the phytoplankton community and
identify the main environmental factors driving the community in five reservoirs constructed in the
region of the high Paraná River. Methods: The phytoplankton and environmental variables were
collected at the lacustrine region of the reservoir, between November 2013 and November 2014,
with interval between collections ranged from 3 to 6 months. The richness and biomass of the
phytoplankton community were measured as a response to the spatial and temporal environmental
variability. Data from environmental variables was analyzed by Principal Component Analysis (PCA).
Non-Metric Multidimensional Scaling Analyzes (NMDS) were performed on the richness and biomass
data of the phytoplankton community. Results: We identified 80 taxa distributed in 11 taxonomic
classes, from which Cyanobacteria and Chlorophyceae were best represented. We did not observe
significant temporal variation for either environmental variables or attributes of the phytoplankton
community, which may be related to the prolonged drought in this period in the Brazilian Southwest.
Higher phytoplankton richness and biomass were found in the Três Irmãos (Tiete River), reservoir
located in the most anthropized basin in the country. Cyanobacteria and dinoflagellates dominated
the biomass in all reservoirs during the studied period. The Ilha Solteira, Jupiá and Porto Primavera
reservoirs showed a tendency to decrease in the values of phytoplankton richness and biomass, and the
reservoirs built in series in the Paraná River probably have strong interdependence, according to the
CRCC concept. Conclusions: Spatial variation in phytoplankton attributes was influenced mainly
by the position occupied by the reservoir in the hydrographic basin, water retention time (RT) and
nutrient concentrations in each reservoir.
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Estrutura da comunidade, Community structure, Cyanobacteria, Tempo de retenção da água, Rio Paraná, Reservatório, Reservoir, Water retention time, Paraná river
Citação
SILVA, Matheus Vieira da; BORTOLINI, Jascieli Carla; JATI, Susicley. The phytoplankton community as a descriptor of environmental variability: a case study in five reservoirs of the Paraná river basin. Acta Limnologica Brasiliensia, Rio Claro, v. 34, p. 1-11, 2022.