Diversidade de insetos da ordem plecoptera (insecta) em riachos do leste maranhense, Brasil

Abstract

Aquatic insects are one of the main groups of fauna of benthic macroinvertebrates in aquatic ecosystems, they have great ecological importance, participating in food chains and being one of the main links in the trophic structures of the ecosystem. Of the aquatic insects Plecoptera is a small order, found in different substrates of aquatic environments, they are organisms sensitive to environmental disturbances and occur mainly in clean and well-oxygenated waters, they are a group that has called a lot of attention for its potential as an indicator of environmental quality. The objective of this work is to verify the richness, diversity of the order Plecoptera in streams belonging to the East of Maranhão with emphasis on the micro-region of Caxias and Codó. Aquatic entomological net in D (rapiché) and manual collection in a 50m transect was used to collect. The specimens were packaged and transported to the aquatic entomology laboratory at the Center for Higher Studies in Caxias - CESC / UEMA and identified at the gender level and fixed in 80% ethyl alcohol. The streams under study are first order (Sumidouro do Padre) and second order (Baixa grande, Baixa Grande II, Buriti Corrente, Correntinho, Primavera). So far a total of 195 specimens of nymphs have been collected, distributed in six streams, all specimens collected belong to the family Perlidae genus Anacroneuria Klapálek, 1909, of the collected substrates the greatest abundance occurred in leaf with 136 specimens, followed by the stone substrate with 29 specimens. The creation of nymphs in the laboratory resulted in the emergence of six females and four male specimen.