Diversity patterns of planktonic microeukaryote communities in tropical floodplain lakes based on 18S rDNA gene sequences
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2019
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The aquatic microbiota plays key roles in ecosystem processes; however, the mechanisms that influence their biogeo graphic patterns are not yet fully understood. Using high-throughput 18S rDNA gene sequencing, we investigated
the composition of planktonic microeukaryotes (organisms sampled using a 68-μm plankton net) in 27 floodplain
lakes of the Araguaia River, central Brazil and explored the influence of environmental and spatial factors for
communities considering taxonomic and trophic groups. Of the 807 operational taxonomic units (OTUs) observed,
Chlorophyta and Charophyta were the groups with greater abundance. Beta diversity was high, and the similarity of
communities decreased as the geographic distance increased. We found a shared explanation between environmental
and spatial predictors for total and autotrophic microbiota. Environmental variables influence only mixotrophic
microbiota. These results suggest an OTU turnover along the floodplain and a spatially structured composition. This
spatial pattern can be derived from the association with extrinsic factors, such as spatially structured environmental variables, that generate spatial dependence. However, the relationship between the composition of microbiota and
environmental conditions is still unclear.
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Araguaia river, Metacommunities, Illumina miseq, Metabarcoding
Citação
MACHADO, Karine Borges et al. Diversity patterns of planktonic microeukaryote communities in tropical floodplain lakes based on 18S rDNA gene sequences. Journal of Plankton Research, Oxford, v. 41, n. 3, p. 241-256, 2019. DOI: 10.1093/plankt/fbz019. Disponível em: https://academic.oup.com/plankt/article/41/3/241/5506755. Acesso em 19 jul. 2023.