Taxocenose de répteis Squamata, com estudo dos hábitos alimentares de Enyalius bilineatus em uma área natural de cerrado no sul de Minas Gerais

Abstract

Current knowledge about the fauna of Squamata in Minas Gerais is based largely on studies conducted in areas of Atlantic Forest, and what is known about studies related to diversity, conservation and other ecological aspects of Squamata fauna in Cerrado areas are scarce. This study was conducted in a Cerrado remnant in the southern state located in the Municipality of Ingaí and aimed to describe the composition and estimate the richness of Squamata fauna in different Cerrado physiognomies, and to evaluate the diet of Enyalius bilineatus, based the analysis of stomach contents. The sampling of Squamata in the field occurred between November 2010 and November 2011 by time constrained search, pitfall traps and occasional encounters. Specimens of E. bilineatus analyzed were already deposited in the CRLZ of the Unilavras and were obtained from previous sampling on the local fauna. Considering the methods employed were sampled six species of snakes (Colubridae (4) and Viperidae (2)) and 10 species of lizards (Anguidae (1), Gymnophthalmidae (2), Leiosauridae(2), Scincidae (2), Teiidae (2) and Tropiduridae (1)) in different and the richness estimate measured by accumulation species curve showed a richness of 23.81 species. Gallery forest was the physiognomy with the highest species richness and abundance and distribution of the relative abundances more uniform compared to other areas. The most abundant species was T. itambere with 63.2% of the total number of records for RBUB. Gallery forest and cerrado stricto sensu were the areas with the highest similarity (CM = 0.45) sharing four species in common. The highest richness and abundance of species in gallery forest may be related to the larger size of this, which is the predominant physiognomy within the RBUB. Regarding the diet data from 22 specimens with stomach contents, was recorded a total of 156 prey items belonging to 12 taxonomic groups, most arthropods, emphasizing the generalist character of species. Ants amounted to the most frequent in terms of occurrence for both sexes and were also important in terms of numerical frequency and volume for males and females. There were no quantitative differences (number of items eaten) in the diet of sexes, showing no sex differences in the diet of E. bilineatus in this regard, largely due to ingestion of ants that are prey items small and quite ingested by lizards independent of the size thereof.