Environmental filters influencing phytoplankton taxonomic structure in cascade reservoirs
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2020
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Resumo
In this study we analyzed the dynamics of the phytoplankton community in two cascade reservoirs in six sampling periods,
to investigate the infuence of environmental flters on phytoplankton, and the community concordance with the environ‑
mental variability. We addressed several questions, and from phytoplankton biomass data and abiotic variables sampled at
the Salto Osório and Salto Santiago reservoirs, Paraná, Brazil, we obtained the answers. A total of 136 taxa distributed in
cyanobacteria, diatoms, green algae and mixotrophic fagellates were recorded. Diatoms and mixotrophic fagellated algae
contributed most of the phytoplankton biomass in both reservoirs. Environmental flters such as nutrient concentrations,
light, pH, depth and temperature had the greatest infuence on phytoplankton taxonomic structure, being the community in
concordance with the environmental conditions. Although some environmental diferences between reservoirs were recorded,
the phytoplankton community was similar, probably associated with environmental connectivity, but with diferences in
biomass, which is possibly associated with seston retention in upstream regions. Our results revealed important drivers that
infuence the phytoplankton structure and dynamics in reservoirs, and this understanding is of interest, due to the maintenance
of ecosystem functions and services.
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Biomass, Subtropical reservoir, Planktonic algae, Impoundment
Citação
BORTOLINI, Jascieli Carla et al. Environmental filters influencing phytoplankton taxonomic structure in cascade reservoirs. Brazilian Journal of Botany, São Paulo, v. 43, p. 405-412, 2020. DOI: 10.1007/s40415-020-00604-9. Disponível em: https://link.springer.com/article/10.1007/s40415-020-00604-9. Acesso em: 12 jun. 2023.