The reproductive biology of Dendropsophus minutus (Amphibia: Anura) in South of Brazil

Peterson Trevisan Leivas, Tiago Burda Mayer, Luiz Fernando Fávaro

Abstract


This study investigated the reproductive biology of Dendropsophus minutus (Peters, 1972), in a temperate area of Mixed Ombrophilous Forest of southern Brazil, based on the histological analyses. A total of 89 adult males, four adult females and eight juvenile were collected during monthly sampling in the State of Paraná, Brazil. In the laboratory, sex determination and macroscopic determination of the gonad development stage of each specimen were carried out. Subsequently, the gonads were removed and their mass was determined to obtain an individual gonadosomatic index (GSI) and processed according to the histological routine. Based on the quantity and the type of germinative cells, males had their testicles classified in four stage (immature, initial maturation, advanced maturation and mature) and females had their ovaries only in mature stage. Although we observed males in advanced stages of maturation throughout the year, they increased in frequency during winter and spring. The maturation curve for male showed that reproductive activity was more intense from August to January, when the mature females were recorded. We showed that male reproductive activity is affected by local abiotic factors that stimulate male sexual activity from the end of winter to the beginning of summer, period in which the temperature and rain are elevated.

Full Text:

PDF

Refbacks

  • There are currently no refbacks.