Effects of Environmental Variables and Habitat Integrity on the Structure of the Aquatic Insect Communities of Streams in the Cerrado-Caatinga Ecotone in Northeastern Brazil.

Castro, E R; Veras, D S; Lustosa, G S; Azevêdo, C A S; Juen, L

Castro, E R; Veras, D S; Lustosa, G S; Azevêdo, C A S; Juen, L.

Afiliação

Castro ER; Programa de Pós-Graduação em Biodiversidade, Ambiente e Saúde, Lab. de Entomologia Aquática, Univ. Estadual do Maranhão, Campus Caxias, Caxias, Brasil. elizcastro_05@yahoo.com.br.
Veras DS; Programa de Pós-Graduação em Biodiversidade, Ambiente e Saúde, Lab. de Entomologia Aquática, Univ. Estadual do Maranhão, Campus Caxias, Caxias, Brasil.
Lustosa GS; Lab. de Ecologia de Comunidades, Instituto Federal do Maranhão, Campus Caxias, Caxias, Maranhão, Brasil.
Azevêdo CAS; Lab. de Ecologia de Comunidades, Instituto Federal do Maranhão, Campus Caxias, Caxias, Maranhão, Brasil.
Juen L; Programa de Pós-Graduação em Biodiversidade, Ambiente e Saúde, Lab. de Entomologia Aquática, Univ. Estadual do Maranhão, Campus Caxias, Caxias, Brasil.

Neotrop Entomol ; 50(1): 21-31, 2021 Feb.

Article em En | MEDLINE | ID: mdl-33104980

RESUMO

Alterations in the environmental gradients of streams have a direct influence on the structure of the insect communities of the orders Ephemeroptera, Plecoptera, and Trichoptera (EPT), which are extremely sensitive to changes in habitat. The present study evaluated how habitat integrity in streams influence the composition of EPT genera, by testing three hypotheses: (i) the composition of the EPT genera is modified along the gradient of environmental disturbance; (ii) the composition of the EPT genera is more homogeneous in gradients with a higher degree of anthropogenic disturbance, and (iii) the greatest degree of environmental disturbance along the gradient results in the reduction of the richness and abundance of EPT genera. The study focused on 14 tributaries of the middle Itapecuru River, within an area of ecotone between the Brazilian Cerrado and Caatinga biomes. Data on the structure and physicochemical traits of the streams were collected between September 2014 and July 2015, a period that covers both the dry and rainy seasons in the study region. The results of the present study indicate that the composition of the EPT genera is modified in accordance with the variation in the habitat integrity, although, in contrast with expectations, more impacted areas had a more heterogeneous composition than undisturbed ones. The areas with more integrated landscapes contribute positively to the richness and abundance of EPT genera of the streams of the Cerrado-Caatinga ecotone. Given this, habitat integrity provide an important predictor of EPT diversity in the streams of the Cerrado-Caatinga ecotone.

Assuntos

Ecossistema; Monitoramento Ambiental; Insetos/classificação; Rios; Animais; Organismos Aquáticos; Brasil; Rios/química; Estações do Ano

Palavras-chave

Stream ecology; flooding; heterogeneity; physicochemical variables

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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Monitoramento Ambiental / Ecossistema / Rios / Insetos Tipo de estudo: Prognostic_studies Limite: Animals País/Região como assunto: America do sul / Brasil Idioma: En Revista: Neotrop Entomol Assunto da revista: BIOLOGIA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda

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