When foraging and fear meet: using foraging hierarchies to inform assessments of landscapes of fear

Searle, Kate R., Stokes, Chris J., and Gordon, Iain J. (2008) When foraging and fear meet: using foraging hierarchies to inform assessments of landscapes of fear. Behavioral Ecology, 19 (3). pp. 475-482.

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Abstract

Anthropogenic environmental change is escalating in magnitude, rate, and extent, inducing cascading effects across trophic levels. Assessing the nature of these alterations to trophic interactions requires an understanding of how species' demography and behavior are altered by simultaneous, complex pressures. For predator-prey relationships, "landscapes of fear" have been used to measure the trade-off prey animals make between maximizing energy gain and minimizing risk of predation. However, hierarchical foraging theory predicts that the degree to which aggregations of resources are used will depend upon the context in which they occur, not merely on the predation risk associated with those patches. We develop a conceptual framework that synthesizes theories of foraging hierarchies and landscapes of fear to show how predation risk and resource variation may interact to influence foraging behavior. We show, experimentally, that northern brown bandicoots (Isoodon macrourus), do respond to the likely predation risk when making their foraging decisions; however, the food resources in the habitat surrounding the food patch also play a significant role in the degree to which food patches are used. This result has important implications for the accuracy of assessments of landscapes of fear and habitat use using observations of animal foraging behavior.

Item ID: 42545
Item Type: Article (Research - C1)
ISSN: 1465-7279
Keywords: foraging hierarchies, giving-up densities, landscapes of fear, predation risk, predator-prey relationships, resource heterogeneity
Funders: CSIRO Sustainable Ecosystems
Date Deposited: 10 Feb 2016 07:43
FoR Codes: 06 BIOLOGICAL SCIENCES > 0608 Zoology > 060801 Animal Behaviour @ 75%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060201 Behavioural Ecology @ 25%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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