Data/hora: 04/06/2024 04:22:31

Provedor de dados: | 42
País: | Brazil
Título: | Chironomidae (Insecta: Diptera) of different habitats and microhabitats of the Vacacaí-Mirim River microbasin, Southern Brazil
Autores: | KÖNIG,RODRIGO; SANTOS,SANDRO.
Data: | 2013-09-01
Ano: | 2013
Palavras-chave: | Aquatic insects; Benthic substrates; Anthropogenic pressures; Faunal structure.
Resumo: | The Chironomidae family is one of the main groups of aquatic insects present in streams. This work aimed to investigate the influences of anthropogenic pressures and substrate types on chironomid community composition and structure. Chironomid larvae were collected during the summer of 2007 at four sites along the Vacacaí-Mirim River microbasin, chosen based on the different available benthic substrates. The organisms were identified in the laboratory at the genus level, and the density, the rarefied taxonomic richness and the Shannon diversity index were calculated. The faunal structure was subjected to an ANOVA to compare the metrics among sites and substrates. The community composition of the sites was subjected to a multivariate statistical analysis. Differences in the composition, richness, density, and diversity were observed among the sites due to differences in the levels of nutrients and solids generated by the presence of crops close to water bodies. Samples collected from sandy substrates exhibited a lower density and taxonomic richness because sand is a poorer substrate than the others that were sampled. In organic or mixed substrates with higher energy availability and better shelter conditions, the observed densities were higher. The physical and chemical conditions and the morphometric characteristics of the sites were more influential than the substrates.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300975
Editor: | Academia Brasileira de Ciências
Relação: | 10.1590/S0001-37652013000300010
Formato: | text/html
Fonte: | Anais da Academia Brasileira de Ciências  v.85 n.3 2013
Fonte: | info:eu-repo/semantics/openAccess