Abstract
Context
The spatial distribution of non-substitutable resources implies diverging predictions for animal movement patterns. At broad scales, animals should respond to landscape complementation by selecting areas where resource patches are close-by to minimize movement costs. Yet at fine scales, central place effects lead to the depletion of patches that are close to one another and that should ultimately be avoided by consumers.
Objectives
We developed a multi-scale resource selection framework to test whether animal movement is driven by landscape complementation or resource depletion and identify at which spatial scale these processes are relevant from an animal’s perspective.
Methods
During the dry season, surface water and forage are non-substitutable resources for African elephants. Eight family herds were tracked using GPS loggers in Hwange National Park, Zimbabwe. We explained habitat selection during foraging trips by mapping surface water at two scales with gaussian kernels of varying widths placed over each waterhole.
Results
Unexpectedly, elephants select areas with low waterhole density at both fine scales (< 1 km) and broad scales (5–7 km). Selection is stronger when elephants forage far away from water, even more so as the dry season progresses.
Conclusions
Elephant selection of low waterhole density areas suggests that resource depletion around multiple central places is the main driver of their habitat selection. By identifying the scale at which animals respond to waterhole distribution we provide a template for water management in arid and semi-arid landscapes that can be tailored to match the requirements and mobility of free ranging wild or domestic species.
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Acknowledgements
The Director General of the Zimbabwe Parks and Wildlife Management Authority and the Research Council of Zimbabwe are thanked for providing the opportunity to carry out this research. Funding was provided by the grant SAVARID ANR-11-CEPS-003 and the grant LANDTHIRST ANR-16-CE02-0001-01 of the French ‘Agence National de la Recherche’, and a PhD fellowship from the Ecole Normale Supérieure & Université de Montpellier. This work was conducted within the framework of the Zone Atelier Hwange—Hwange LTSER (www.za-hwange.cnrs.fr) and under the auspices of the Research Platform “Production and Conservation in Partnership” (www.rp-pcp.org), with support from the FSP-RenCaRe project (FSP No 2011-36). Special thanks to Simon Benhamou for insightful comments on earlier versions of the manuscript. S. Cushman and two anonymous reviewers provided useful comments that improved the manuscript.
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Valls-Fox, H., De Garine-Wichatitsky, M., Fritz, H. et al. Resource depletion versus landscape complementation: habitat selection by a multiple central place forager. Landscape Ecol 33, 127–140 (2018). https://doi.org/10.1007/s10980-017-0588-6
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DOI: https://doi.org/10.1007/s10980-017-0588-6