Efeito da heterogeneidade de habitats na composição e distribuição da assembleia de Chironomidae (Diptera) em riachos preservados de Mata Atlântica, no sul do Brasil

• Ano de defesa: 2011
• Autor(a) principal: Gurski, Fernanda de Almeida
• Orientador(a): Bueno, Norma Catarina
• Banca de defesa: Bagatini, Yara Moretto , Sanches, Paulo Vanderlei
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual do Oeste do Parana
• Programa de Pós-Graduação: Programa de Pós-Graduação Stricto Sensu em Recursos Pesqueiros e Engenharia de Pesca
• Departamento: Recursos Pesqueiros e Engenharia de Pesca
• País: BR
• Palavras-chave em Português: Microhabitat; Macroinvertebrados bentônicos; Parque Nacional do Iguaçu; Larvas de Chironomidae; Chironomidae (Insecta: Diptera)
• Palavras-chave em Inglês: Microhabitat; Larvae; Iguaçu National Park; Flowing
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::RECURSOS PESQUEIROS E ENGENHARIA DE PESCA
• Link de acesso: http://tede.unioeste.br:8080/tede/handle/tede/1968

The heterogeneity of substrate in streams promotes the colonization and diversity of benthic organisms. Among them, Chironomidae larvae are one of the most abundant in aquatic ecosystems. This study aimed at determining the composition, richness, diversity and the existence of distribution patterns of Chironomidae larvae in different microhabitats of preserved streams of Atlantic Forest. Samplings were performed in February and August 2010, with a Surber-type sampler. The environmental variables analyzed were not significantly different between sampled streams, but the taxonomic richness of Chironomidae larvae was distinct between the microhabitats. In the total, 6,429 Chironomidae larvae were identified and classified into 96 taxa belonging to the subfamilies Chironominae, Tanypodinae and Ortocladiinae. The analyses of density, richness, evenness and diversity, in relation to the months, sites and microhabitats, have pointed out statistically significant differences in the larval distribution for the different microhabitats. Among them, the highest richness was observed in the deposits of litter, and the highest number of exclusive species took place in the pool regions. Thus, the composition and structure of the Chironomidae assemblage is directly related to the availability and heterogeneity of habitats in streams.