Abstract
Multiple ecological factors have been hypothesized to influence primate sleeping site selection. Testing multiple hypotheses about sleeping site selection permits examination of the relative strength of distinct ecological factors and expands our ability to understand how selection pressures influence primate sleeping behavior. Here we examine how avoidance of biting insects, thermoregulation, foraging efficiency, tree stability, and interspecific competition influence selection of sleeping sites by proboscis monkeys (Nasalis larvatus) in Indonesian Borneo. We collected data on relative insect abundance, temperature, rainfall, food availability, group size, sleeping site location, and presence of other primates for 12 mo. Using formal model comparison and information criteria, we analyzed the relative importance of these ecological factors in determining one aspect of sleeping site location: distance from the river. Our models supported the avoidance of biting insects and the foraging efficiency hypotheses. Proboscis monkeys slept further inland on nights when the abundance of sandflies was high along the river, and when less food was available along the river. Many studies suggest that primates select sleeping trees and locations to reduce predation risk; our study indicates that additional factors may also be important in determining sleeping site selection.
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Acknowledgments
We thank the Indonesian government, the State Ministry of Research and Technology (RISTEK), and the mayor of Sungai Tolak for giving us permission to conduct this research. All work conformed to research regulations at the University of California, Davis and the laws of the Republic of Indonesia. We acknowledge the support and efforts of the Indonesian field assistants that worked on this project: Ferman, Iskandar and M. Ali. We thank Universitas Tanjungpura (UNTAN) and Flora and Fauna International–Indonesia for serving as our Indonesian counterparts for this project. This manuscript was greatly improved by thoughtful comments from Lynne Isbell, Ikki Matsuda, Vincent Nijman, Joanna Setchell, and an anonymous reviewer. Mark Grote provided invaluable assistance with statistical analysis. This research was funded by a U.S. Fulbright Student Fellowship, a Boren Fellowship, the University of California, Davis Department of Anthropology, and Primate Conservation, Inc.
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Feilen, K.L., Marshall, A.J. Multiple Ecological Factors Influence the Location of Proboscis Monkey (Nasalis larvatus) Sleeping Sites in West Kalimantan, Indonesia. Int J Primatol 38, 448–465 (2017). https://doi.org/10.1007/s10764-017-9953-1
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DOI: https://doi.org/10.1007/s10764-017-9953-1