Estudo de uma popula??o de Molossus molossus (Pallas, 1766) (Mammalia, Chiroptera, Molossidae) na Praia do Gato, Ilha de Itacuru??, Rio de Janeiro

• Autor(a) principal: Freitas, Gustavo Pena
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRRJ
• Texto Completo: https://tede.ufrrj.br/jspui/handle/jspui/1619
• topic: roosts; activity; reproduction; colony size; abrigos; atividade; reprodu??o; tamanho da col?nia; Zoologia

This work aimed to study a population of Molossus molossus (Pallas , 1766) on Praia do Gato, llha de Itacuru??, Rio de Janeiro, analyzing aspects such as variation of colony size, use of roost, reproduction and activity. For this work 18 sampling nights were performed at intervals of 40 days between each month, between August 2009 and August 2011. Mist nets were opened near the access of two roosts, one in a house roof and another in a hollow of a tree. During the 25 sampling months, 689 captures and recaptures were done, and 309 individuals were marked. The number of captured and recaptured animals varied during the sample period, being inversely proportional to the duration of the night, with the months of November/2009 (88 individuals) and December/2009 (78 individuals) recording the highest number of catches. A decreasing number of individuals were observed in the second year of sampling as a possible consequence of the capture stress and/or the learning of the mist nets position by the bats. It was observed a greater number of transient individuals and a higher number of females throughout the study. In the roof was observed a greater number of young bats, possibly due to the higher temperature recorded. The bats performed exchanges between these two roosts throughout the year, being recorded 36 individuals performing exchanges, and the occurrence of 51 of such events. In relation to the reproduction, females had a monoestrous reproductive pattern, comprised between the months of November and January, with the males not showing a definite pattern. In relation to the activity period, the species showed a predominantly crepuscular pattern, with the females leaving the shelters earlier than the males, possibly due to increased energy demand. The animals spent an average of 36 minutes outside the roost, ingesting an average of 0.8 g of food, showing no difference throughout the year.