A variabilidade ambiental influencia a composição e biomassa fitoplanctônica de um reservatório neotropical
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Data
2021
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Resumo
Phytoplankton is an important model of the aquatic
environments functioning, responding directly to environmental variability in space and time.
Therefore, represents an excellent tool for the monitoring of reservoirs, which comprise highly
heterogeneous ecosystems longitudinally, influencing the structure and distribution of phytoplankton species. The objective of this study was to investigate the variation in the composition and biomass
of the phytoplankton in a reservoir in the Goiás state, Brazil, and how these organisms respond to
environmental variability along the reservoir spatial extent in dry and rainy periods. The phytoplankton
and environmental variables were collected during one dry period and other rainy, over seven sampling
sites, distributed in the regions downstream of the dam, lacustrine, intermediate and lotic of the
reservoir. The composition and biomass of the phytoplankton community were measured as a response
to the spatial and temporal environmental variability. We recorded a spatio-temporal variation in water
temperature, light, nutrients, and phytoplankton biomass. Cyanobacteria had the highest biomass in
the lacustrine and intermediate regions, while diatoms in the lotic region, in both periods. The highest
phytoplankton total biomass was recorded in rainy period. We recorded a clear relation between the
phytoplankton biomass and the environmental variability, being that water temperature, turbidity and
soluble iron the ones that showed the biggest influence on the biomass structure. Thus, the composition
and biomass of the phytoplankton community can be important metrics of reservoirs functioning
and, therefore, the phytoplankton study in these ecosystems it’s of interest in their monitoring, since
reservoirs have great ecological, economic or public health relevance.
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Algas planctônicas, Planktonic algae, Barragem, Biovolume, Cianobactérias, Zonação longitudinal, Dam, Cyanobacteria, Longitudinal zonation, Biovolume
Citação
SANTOS, Bárbara Marques dos et al. A variabilidade ambiental influencia a composição e biomassa fitoplanctônica de um reservatório neotropical. Oecologia Australis, Rio de Janeiro , v. 25, n. 1, p. 90-102, 2021.