Brazilian Journal of Biology, Volume: 61, Issue: 3, Pages: 449-454, Published: AUG 2001 Brazilian Journal of Biology, Vol 61, Iss 3, Pp 449-454 (2001) Brazilian Journal of Biology v.61 n.3 2001 Brazilian Journal of Biology Instituto Internacional de Ecologia (IIE) instacron:IIE Brazilian Journal of Biology, Vol 61, Iss 3, Pp 449-454