Environmental gradients as filters on the composition of aquatic insect of the Cerrado-Caatinga, Brazil

Abstract

The patterns of aquatic insect diversity are influenced by landscape structure and environmental gradients that can be altered significantly through changes in land use. The aim of the present study was to verify if the patterns of diversity of the orders Odonata and Trichoptera vary significantly between preserved and altered sites, along a gradient of environmental impact. Data were collected on the structural and environmental characteristics of the stream, and the assemblages of aquatic insects at seven sampling points in a Cerrado-Caatinga ecotone of northeastern Brazil, in the dry seasons of 2018 and 2019. The results indicated that altered streams had higher electrical conductivity and lowest HII (habitat integrity index) values in comparison with the preserved ones, being determinant in the distribution of genera, and low pH values increased genera richness, informations that can guide management strategies for biodiversity conservation. Which supports the conclusion that the diversity of aquatic insects is determined by the influence of environmental filters in the streams.

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Published
2020-09-28
How to Cite
VIANA, Carolina Gomes et al. Environmental gradients as filters on the composition of aquatic insect of the Cerrado-Caatinga, Brazil. Acta Brasiliensis, [S.l.], v. 4, n. 3, p. 142-148, sep. 2020. ISSN 2526-4338. Available at: <http://revistas.ufcg.edu.br/actabra/index.php/actabra/article/view/362>. Date accessed: 14 dec. 2024. doi: https://doi.org/10.22571/2526-4338362.