Composição da fauna de lagartos e anfisbenídeos (Squamata) em um fragmento de Mata Atlântica na Zona da Mata de Minas Gerais, Brasil

Abstract

The occupation of the natural landscape by human activities is the major threat to local biodiversity. Its consequences are the removal of natural habitats and formation of isolated fragments smaller than the original ones. Studies on composition and distribution patterns of the lizards and amphisbaenians in environments of the Atlantic Forest in Minas Gerais state are scarce. This study conducted an inventory of lizards and amphisbaenians fauna at Fortaleza de Sant'Anna farm in Zona da Mata of Minas Gerais, and provided information to expand knowledge of the distribution and composition of Squamata reptile fauna of the state of Minas general. The region of study is one of the priority areas for conservation of the herpetofauna in the state. The samples were taken in the period between February and December 2011, totaling 28475 days / bucket and 56950 days / funnel. Were installed sets of pitfall traps, funnel and drop in nine points of the fragment, three located in the matrix surrounding the forest, three in the forest edge and three in central areas of the fragment. We recorded 47 specimens belonging to 12 species were registered, distributed in 10 families: Amphisbaenidae, Anguidae, Diploglossidae, Gekkonidae, Gymnophthalmidae, Leiosauridae, Phyllodactylidae, Scincidae, Teiidae and Tropiduridae, and the filodactilídeo Gymnodactylus darwinii was the most abundant species (n = 15) and the only found in all of the sampling areas with traps. The species that stood out among the least abundant ones was Diploglossus fasciatus (n = 1), because their lonely habits and the low density in their populations turn his/her rarer registration. Among the 12 registered species, the exclusive of the "Matriz" atmosphere were Amphisbaena microcephala, Diploglossus fasciatus and Ophiodes striatus, in the one of "border" they were Mabuya dorsivittata and Placosoma glabellum and in the "Centro" it was Heterodactylus imbricatus. There was not significant difference in the occurrence frequency among the head office areas, it embroiders and center of the fragment (t = 0,1955; p = 08989). The variance analysis showed that there was not significant difference in the number of specimens for each area (t = 0,5937; p = 06717). The curve of accumulation of species of the collection points indicated that there was not stabilization in the increment of species of lizards and anfisbenídeos for the area, indicating the need of continuity of the work.