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  • Title: Foraging ecology of the mountain monkey (Cercopithecus l'hoesti): implications for its evolutionary history and use of disturbed forest.
    Author: Kaplin BA, Moermond TC.
    Journal: Am J Primatol; 2000 Apr; 50(4):227-46. PubMed ID: 10768348.
    Abstract:
    We present the first systematic field study on the feeding ecology of the mountain monkey (Circopithecus l'hoesti), a semi-terrestrial guenon. We compare our results with findings from a concurrent study of blue monkeys (C. mitis doggetti, which have an overlapping home range) conducted over ten months in the Nyungwe Forest Reserve, Rwanda. The mountain monkeys spent 35% of observation time feeding on terrestrial herbaceous vegetation. Thirty-five fruit and seed species comprised 42% of their diet, and invertebrates composed 9%. They spent 38% of observation time on the ground and 27% of observation time in canopy trees. Individuals were observed for equivalent proportions of time foraging on the ground for herbs and in canopy trees for fruits. Although mountain monkeys primarily foraged in undisturbed open areas, they also used disturbed open habitats for this purpose. Synthesizing our results with Pleistocene forest history and C. l'hoesti evolutionary history, we suggest that, although these monkeys readily use disturbed forest for herb foraging, they are a forest-adapted species which has adopted a terrestrial lifestyle to exploit the abundant herb layer common to montane forests.
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