Journal Article
Population size and survival of the Malagasy fruit bat Rousettus madagascariensis (Pteropodidae) in Ankarana, northern Madagascar
Noroalintseheno Lalarivoniaina, O.S., Rajemison, F.I., Ramanantsalama, R.V., Andrianarimisa, S. and Goodman, S.M.
Record Number:
4450
Year:
2019
Journal:
Acta Chiropterologica
Pages:
103-113
Volume:
21
Abstract:
Population size and survival are crucial factors to understand population dynamics of a given species, especially those that have long
life spans and delayed sexual maturity, such as Pteropodidae bats. We studied the population size and apparent survival of
individuals at a day roost site of an endemic cave-dwelling Malagasy fruit bat, Rousettus madagascariensis, in relation with age and
sex. 1,801 individuals were captured and tagged over the course of four years in the Grotte des Chauves-souris, Réserve Spéciale
d’Ankarana, northern Madagascar. The Cormack-Jolly-Seber model and the POPAN model in the program MARK were used to
analyze mark-recapture data and to estimate apparent individual survival and population size. The apparent survival of individuals
ranged from 0.46 to 0.60, but exhibited significant variability associated with age, sex, and time. Apparent survival is lower in adults
compared to sub-adults (Φadult = 0.49; Φsub-adult = 0.63). For adults, the apparent survival of males was higher (Φmale = 0.50; Φfemale
= 0.47), and conversely for sub-adults, it was in favor of females (Φmale = 0.55; Φfemale = 0.70). Population size ranged from 1,245
(CI: 268–3,050) to 5,868 (CI: 3,520–10,601) and was significantly higher during the wet season as compared to the dry season. The
survival rate in this population is strongly influenced by mortality and secondarily by dispersal. We found that the apparent survival
of individuals has a positive impact on population growth but less than birth rate. Thus, the health and sustainability of the population
relies heavily on individual survival.
Times Cited:
1
Relevent Species:
Related Records:
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