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From ridge tops to ravines: landscape drivers of chimpanzee ranging patterns

Samantha J. Green, Bryan J. Boruff, Cyril C. Grueter
doi: https://doi.org/10.1101/795393
Samantha J. Green
1School of Human Sciences, The University of Western Australia, Perth, Australia
2UWA Africa Research & Engagement Centre, The University of Western Australia, Perth, WA, Australia
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  • For correspondence: samantha.green@research.uwa.edu.au
Bryan J. Boruff
3School of Agriculture and Environment, The University of Western Australia, Perth, Australia
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Cyril C. Grueter
1School of Human Sciences, The University of Western Australia, Perth, Australia
2UWA Africa Research & Engagement Centre, The University of Western Australia, Perth, WA, Australia
4Centre for Evolutionary Biology, School of Biological Sciences, The University of Western Australia, Perth, Australia
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Abstract

Recent improvements in tracking technologies have resulted in a growing number of fine-scale animal movement studies in a variety of fields from wildlife management to animal cognition. Most studies assume that an animal’s “optimal” foraging route is linear, ignoring the role the energy landscape can play in influencing movement efficiency. Our objective was to investigate whether landscape features that affect movement costs; topographic variation, and super and substrate, influence the movement of chimpanzees (Pan troglodytes) in a rugged, montane environment. We tested for route re-use and preferential use of human-made trails and ridge tops using 14 months of focal follow data from 14 individuals and maps of established chimpanzee trails. Chimpanzees travelled on human-made trails significantly more than expected and showed weak preference for use of ridge tops for travel. Line density analysis demonstrated route re-use in chimpanzees and uncovered a network of high-use routes across their range. To our knowledge, this is the first study to empirically demonstrate route re-use and preferential use of human-made trails for travel by chimpanzees. We discuss the energetic and cognitive benefits of trail use and the implications for chimpanzee sociality. By applying the latest GIS analytical techniques to fine-scale movement data, this study demonstrates the importance of incorporating landscape features in predictive animal movement models.

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Posted October 07, 2019.
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From ridge tops to ravines: landscape drivers of chimpanzee ranging patterns
Samantha J. Green, Bryan J. Boruff, Cyril C. Grueter
bioRxiv 795393; doi: https://doi.org/10.1101/795393
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From ridge tops to ravines: landscape drivers of chimpanzee ranging patterns
Samantha J. Green, Bryan J. Boruff, Cyril C. Grueter
bioRxiv 795393; doi: https://doi.org/10.1101/795393

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