Comunidades de formigas (Hymenoptera: Formicidae) de serapilheira em áreas de cerrado “stricto sensu” em Minas Gerais

Resumo

The ant communities in both a native cerrado remnant in good preservation conditions and an anthropized area have been studied at Bom Despacho, Minas Gerais, Brazil. The Winkler technique was used to extract the litter ants, taking out 50 one-square meter litter samples in each area. Sixty-seven species were collected in the well-preserved cerrado area, and 45 in the anthropized one. Important differences were observed between the cerrado remnant and the degraded area, mainly regarding the generic and specific richness. Species richness (Chao2 index) in the native area proved to be higher, while the dominance, evaluated by the Berger-Parker index, was 0.11 (for Solenopsis sp.1) in this area, and 0.13 (for Pheidole fallax) in the degraded one. The dispersion index (P05) showed that the native community is more homogenous that of the degraded cerrado. The Myrmicinae were most frequently found (49 species), followed by the Formicinae (17 species). Camponotus and Pheidole had the largest species numbers (10 for each) among all genera.