Dieta y patrón reproductivo de Rhogeessa minutilla (Chiroptera: VespertUionidae) en una zona árida de Los Andes de Venezuela
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Sosa, Maricela
De Ascencao, Antonio
Soriano, Pascual J
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Universidad de Costa Rica
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En un estudio realizado durante un año en un arbustal espinoso en el bolsón xerofítico de Lagunillas, en Los Andes venezolanos se evaluó la dieta y condición reproductiva del murciélago Rhogeessa minutilla. El análisis de las muestras fecales reveló que la dieta de este murciélago vespertiliónido está constituida por insectos cuya longitud corporal oscila entre los 3- I 2 mm, representados en 10 ordenes y 29 familias. El 84.9% de la dieta está representada en cuatro ordenes: Diptera (42.5), Hymenoptera (18.2), Lepidoptera (13.3) y Coleoptera (10.9). La variación estacional de la dieta, la cual se manifiesta bajo un continuo reemplazo de los taxones consumidos y el amplio espectro de la misma parece señalar a R. minutilla como una especie oportunista en cuanto al tipo de presa, pero selectiva en cuanto al tamaño y dureza de la misma. La información reproductiva reveló un pico de preñeces en el lapsóman;o-mayo y la presencia de juveniles durante junio-julio, lo cual parece indicar que el patrón reproductivo de la especie consiste en una monoestría estacional, asociada a la mayor disponibilidad de insectos que parece existir durante la estación de lluvias.
The diet and reproductive condition of the bat Rhogeessa minutilla was evaluated throughout a year in a thom shrub of the xerophitic pocket of Lagunillas in the Venezuelan Andes. The analysis of fecal samples showed that this vespertilionid bat eats small insects (3-12 mm) which are represented in 10 orders and 29 families. of the global diet, 84.9% belongs to four orders: Diptera (42.5), Hymenoptera (18.2), Lepidoptera (13.3) and Coleoptera (10.9). The wide range of diet and seasonal replacement of the prey taxa, seem 10 point out that R. minutilla is an opportunistic species in terms of the kind of prey, but selective in its size and hardness. The reproductive data reveals a single peak of pregnancies in the March-May periodo and presence of juveniles in June-July. This seems to indicate a seasonal monoestrous reproduetive pattem probably as a response to the major inseet availability in the rainy season.
The diet and reproductive condition of the bat Rhogeessa minutilla was evaluated throughout a year in a thom shrub of the xerophitic pocket of Lagunillas in the Venezuelan Andes. The analysis of fecal samples showed that this vespertilionid bat eats small insects (3-12 mm) which are represented in 10 orders and 29 families. of the global diet, 84.9% belongs to four orders: Diptera (42.5), Hymenoptera (18.2), Lepidoptera (13.3) and Coleoptera (10.9). The wide range of diet and seasonal replacement of the prey taxa, seem 10 point out that R. minutilla is an opportunistic species in terms of the kind of prey, but selective in its size and hardness. The reproductive data reveals a single peak of pregnancies in the March-May periodo and presence of juveniles in June-July. This seems to indicate a seasonal monoestrous reproduetive pattem probably as a response to the major inseet availability in the rainy season.