Population ecology of a group of Alouatta palliata in a premontane forest of Costa Rica

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José F. González-Maya

Abstract

The mantled howler monkey, Alouatta palliata, has been extensively studied throughout its distribution in lowland areas, but studies in mountain ecosystems still are not very numerous. This study was carried out on the slopes of the Rincón de la Vieja volcano at approximately 700 masl, in an area composed of a mixture of remnants of primary and secondary forests and pastures dedicated to livestock, with strong tourism activity. A troop was studied were group size, home range, daily movements, behavior, habitat use, and diet were evaluated. Resting was the predominant activity and a significant relationship between movement and feeding was found. In turn, six species of plants were reported within the diet of the species, with a preference for Garcinia intermedia, the most consumed part was young leaves. A home range of 889.16 m2 and an average of 516 m daily routes were estimated during the study period. Three of the four available habitats were used in a high proportion with respect to their availability. The results barely differ with  populations from previous studies in lowland areas and in habitats with less pressure, indicating that it is possible that tourist visitation does not have a significant influence on the troops of the species in disturbed habitats. 

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