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Structure and species composition of diatom community during the wet season in three floodplain lakes of Brazilian Pantanal
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Resumo(s)
In order to access environmental conditions, the use of bioindicators that have a close relationship
with environmental stressors is a largely common practice, but when evaluating
environmental inferences, the individual dominant taxa need to be interpreted. Humid
regions such as the marshlands are fragile ecosystems and sustain communities of microalgae,
often used as bioindicators, of which diatoms are a good example. Although they provide
an excellent response to chemical and physical changes in water, diatom studies in
surface sediments in wetlands are scarce worldwide. To determine whether diatom species
have the potential to provide unambiguous inferences in the influence of environmental factors,
we have evaluated diatom abundance in surface sediment, from three Pantanal lakes,
against a set of environmental gradients: pH, dissolved oxygen, turbidity, conductivity, total
dissolved solids, water temperature, index of trophic water status, total phosphorus and
total nitrogen. The Ferradura lake presented an oligotrophic state and both Burro and Caracara
´ lakes presented mesotrophic state. Diatoms were more abundant in the a mesotrophic
conditions, but with higher species richness in the oligotrophic conditions. Depending on the
N:P ratio, the nutrients nitrogen and phosphorus can also play the role of pollutants and may
have negative and unpredictable effects in the environment, such as biotic homogenization.
Despite the spatial variation in species, there was a greater richness of Eunotia Ehrenberg
species, with the highest relative density of Eunotia formica Ehrenberg and E. pantropica
Glushchenko, Kulikovskiy & Kociolek, due to the environmental acidic conditions, a determining
characteristic of this genus. It was also observed that a small increase in the level of
phosphorus generated an increase in the abundance of Aulacoseira Thwaites with the highest
relative density of A. pusilla (Meister) Tuji & Houki and A. veraluciae Tremarin, Torgan &
T.Ludwig. However, A. italica dominated in the moderately acidic environment. The results
can help with decisions in impacted areas to solve socioeconomic problems, environmental
management and biodiversity
Descrição
Research Article
Palavras-chave
diatom community wet season floodplain lakes Brazilian Pantanal
Contexto Educativo
Citação
Nardelli MS, Bicudo DC, Sampaio SC, Cordovil CMdS (2021) Structure and species composition of diatom community during the wet season in three floodplain lakes of Brazilian Pantanal. PLoS ONE 16(5): e0251063
Editora
Plos