Abstract

THOME, Maria Tereza Chiarioni  and  BRASILEIRO, Cínthia Aguirre. Sexual Dimorphism, habitat use and seasonal abundance of Elachistocleis cf. ovalis (Anura: Microhylidae) in a Cerrado remnant of São Paulo state, southeastern Brazil. Biota Neotrop. [online]. 2007, vol.7, n.1, pp. 0-0. ISSN 1676-0603.  http://dx.doi.org/10.1590/S1676-06032007000100003.

Elachistocleis ovalis is a species presenting taxonomical problems and wide distribution throughout South America. We provide information on sexual dimorphism, calling site, habitat use and seasonal abundance of E. cf. ovalis in a preserved Cerrado area in São Paulo State, southeastern Brazil. Sampling was carried out primarily with pitfall traps. Traps were placed in areas characterized by three different physiognomies: campo sujo, campo cerrado, and gallery forest edge. We found sexual dimorphism, with females being larger than males. Similar dimorphism has already been documented for other populations and congeneric species. The calling site of males was also in agreement with the literature on other populations and species. Habitat use was different among the three environments, with higher abundance in gallery forest edges. This population showed a clear pattern of seasonal activity, in which abundance was higher during rainy seasons, as well as other Cerrrado anuran species. Abundance was related to relative air humidity and maximum temperature, two variables whose influence on anurans has already been documented. We found no variation in the abundance patterns of the population between the two years in which samples were carried out.

Keywords : sexual dimorphism; calling site; habitat use; seasonal abundance; Elachistocleis ovalis; Cerrado; São Paulo.