| Abstract: | The functional response of a predator to changing prey density is an important determinant of stability of predatora??prey systems. We show how Manly‘s selection indices can be used to distinguish between hyperbolic and sigmoidal models of a predator functional response to primary prey density in the presence of alternative prey. Specifically, an inverse relationship between prey density and preference for that prey results in a hyperbolic functional response while a positive relationship can yield either a hyperbolic or sigmoidal functional response, depending on the form and relative magnitudes of the density-dependent preference model, attack rate, and handling time. As an example, we examine wolf (Canis lupus) functional response to moose (Alces alces) density in the presence of caribou (Rangifer tarandus). The use of selection indices to evaluate the form of the functional response has significant advantages over previous attempts to fit Holling‘s functional response curves to killing-rate data directly, including increased sensitivity, use of relatively easily collected data, and consideration of other explanatory factors (e.g., weather, seasons, productivity). |
| Genre: | Article |
| ProdID: | 1003675 |
| Citation Author: | Joly, D. O.; Patterson, B. R. |
| Citation Contributing Office: | National Wildlife Health Center |
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| Citation End Page: | 1639 |
| Citation Issue: | 6 |
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| Citation Language: | English |
| Citation Larger Work Title: | Ecology |
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| Citation Number Of Pages: | 5 |
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| Citation Phsyical Description: | p. 1635-1639 |
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| Citation Search Results Text: | Use of selection indices to model the functional response of predators; 2003; Article; Journal; Ecology; Joly, D. O.; Patterson, B. R. |
| Citation Start Page: | 1635 |
| Citation Volume: | 84 |
| Citation Year: | 2003 |
| Type: | citation/reference |
| Text: | Use of selection indices to model the functional response of predators; 2003; Article; Journal; Ecology; Joly, D. O.; Patterson, B. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (INDEX PAGE): | http://www.esajournals.org/doi/abs/10.1890/0012-9658(2003)084%5B1635:UOSITM%5D2.0.CO%3B2 |
| Date Other: | Wed, 1 Jan 2003 00:00 -0600 |
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