Resumo. As borboletas constituem um dos grupos mais utilizados em estudos de monitoramento e mensuração do equilíbrio ambiental, uma vez que são sensíveis a qualquer tipo de alteração ambiental. O objetivo do presente estudo é divulgar a primeira lista de espécies de borboletas da REBIO do Gurupi e estimar a representatividade dessas espécies na comunidade. Foram realizadas coletas bimestrais, durante sete dias consecutivos, entre jan/2010 e jul/2011. Os espécimes foram obtidos com uso de rede entomológica e armadilhas do tipo Van Someren-Rydon. Na análise dos dados foram calculados a frequência das espécies, índices de diversidade, estimativas de riqueza e obteve-se a curva de acúmulo de espécies. Foram obtidos 413 espécimes de 91 espécies, 64 gêneros, 14 subfamílias e seis famílias. A espécie mais frequente foi Morpho menelaus (Linnaeus, 1758). Os índices de diversidades obtidos, quando comparados a outros estudos, são expressivos; a estimativa de espécies e a curva de acúmulo mostram que a comunidade amostrada está subestimada. Com esse trabalho, o Maranhão alcançou 358 espécies de borboletas registradas. Os dados ressaltam a importância da REBIO e das demais Unidades de Conservação para a manutenção da riqueza de borboletas da região.Butterflies (Lepidoptera: Papilionoidea and Hesperioidea) from the Gurupi Biological Reserve, Maranhão State, BrazilAbstract. Butterflies are one of the groups most used in monitoring and measuring environmental balance studies, as they are sensitive to any type of environmental change. The objective of the present study is to disclose the first list of butterfly species of REBIO Gurupi and to estimate the representativeness of these species in the community. Were performed collected quarterly during seven consecutive days, between Jan/2010 and Jul/ 2011. The specimens were obtained using an entomological network and traps of the Van Someren-Rydon type. In the analysis of the data were calculated the frequency of species, diversity indexes, wealth estimates and the curve of species accumulation was obtained. The most frequent species was Morpho menelaus (Linnaeus, 1758). The diversity indexes obtained, when compared to other studies, are expressive; The species estimates and the accumulation curve show that the sampled community is underestimated. With this work, Maranhão reached 358 species of registered butterflies. The data emphasizes the importance of REBIO and other conservation units for the maintenance of the butterflies’ wealth of the region.
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