Abstract
Roosts impose selective pressures on bats. Roosts provide mating, hibernation, and nursery sites; promote social interactions, digestion of food; and offer protection from adverse weather and predators. Therefore, they have an important role in the ecology and evolution of these mammals. In this work we studied the population dynamics and fidelity of the bat Carollia brevicauda in an artificial roost over a year. We captured bats with a harp-trap between 6:00 p.m. and 12:00 a.m., with a sampling effort of 120 trap hours and a total of 91 tagged individuals. The results showed that the colony remained with a slightly variable number of individuals (15 ± 5) throughout the sampling period. The greater fidelity of females (1.25 ± 0.17) compared to males (0.85 ± 0.12) suggests that this refuge is used as a breeding site. Analysis with the capture-recapture method, according to the Cormack-Jolly-Seber model, indicates that the population is 260 individuals. The recapture rate was low, indicating a high mobility of the individuals, which may be associated with group fission-fusion social behavior. The data suggest that females synchronize gestation to give birth in the rainy season when there is greater availability of food resources and that human constructions, having characteristics of permanent shelters, offer favorable conditions for the reproduction and maternity of this species.
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