Effects of human disturbance and riparian conditions on Odonata (Insecta) assemblages in eastern Amazon basin streams
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2017
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Resumo
Riparian vegetation is an important determinant of the physical, chemical, and biological condition of streams,
and odonates are useful indicators of riparian condition. To identify environmental factors that structure
Odonata assemblages in tropical forest streams, we collected adult odonate specimens and habitat data from 50
stream sites located in the Brazilian municipality of Paragominas (Pará state). We collected 1769 specimens
representing 11 families, 41 genera, and 97 species. Of these species, 56 were Zygoptera, and 41 were
Anisoptera. Improved environmental condition was reflected in increased Zygoptera species richness and re duced Anisoptera species richness. Channel shading was strongly and positively related to Zygoptera richness,
and negatively to Anisoptera richness. Zygoptera species richness, but not Anisoptera species richness, was
related positively to bank angle, quantity of wood in the stream bed, electrical conductivity, and decreased water
temperature. Altered riparian vegetation structure was the principal determinant of odonate assemblage
structure. Our results indicate that maintaining intact riparian vegetation is fundamental for conserving or re establishing aquatic odonate assemblage structure.
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Anthropogenic impact, Physical habitat, Damselflies, Deforestation, Dragonflies
Citação
OLIVEIRA-JUNIOR, José Max Barbosa de et al. Effects of human disturbance and riparian conditions on Odonata (Insecta) assemblages in eastern Amazon basin streams. Limnologica, Amsterdam, v. 66, p. 31-39, 2017. DOI: 10.1016/j.limno.2017.04.007. Disponível em: https://www.sciencedirect.com/science/article/pii/S0075951116301657. Acesso em: 25 jul. 2023.