Energetic Responses to Variation in Food Availability in the Two Mountain Gorilla Populations (Gorilla Beringei Beringei)
AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 158:487–500 (2015) Energetic Responses to Variation in Food Availability in the Two Mountain Gorilla Populations (Gorilla beringei beringei) Edward Wright,1* Cyril C. Grueter,2 Nicole Seiler,1 Didier Abavandimwe,3 Tara S. Stoinski,4 Sylvia Ortmann,5 and Martha M. Robbins1 1Max Planck Institute for Evolutionary Anthropology, Leipzig 04103, Germany 2School of Anatomy, Physiology and Human Biology, The University of Western Australia,Crawley, Perth, WA 6009, Australia 3Karisoke Research Center, The Dian Fossey Gorilla Fund International, Musanze, North Province, Rwanda 4The Dian Fossey Gorilla Fund International, Atlanta, GA 30315, USA 5Leibniz Institute for Zoo and Wildlife Research, Berlin, Germany KEY WORDS food availability; energy intake rate; daily travel distance ABSTRACT Objective: Here, we compare food availability and relate this to differences in energy intake rates, time spent feeding, and daily travel distance of gorillas in the two populations. Comparative intraspecific studies investigating spatiotemporal variation in food availability can help us under- stand the complex relationships between ecology, behavior, and life history in primates and are relevant to under- standing hominin evolution. Differences in several variables have been documented between the two mountain gorilla populations in the Virunga Massif and Bwindi Impenetrable National Park, but few direct comparisons that link ecological conditions to feeding behavior have been made. Materials and Methods: Using similar data collection protocols we conducted vegetation sampling and nutri- tional analysis on important foods to estimate food availability. Detailed observations of feeding behavior were used to compute energy intake rates and daily travel distance was estimated through GPS readings. Results: Food availability was overall lower and had greater temporal variability in Bwindi than in the Virungas.
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