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OPTIMALLY FORAGING MICE MATCH PATCH USE WITH HABITAT DIFFERENCES IN FITNESS

OPTIMALLY FORAGING MICE MATCH PATCH USE WITH HABITAT DIFFERENCES IN FITNESS We tested the fundamental assumption of the ““optimality paradigm”” that the foraging behavior of individual organisms corresponds to what we would expect if it had been honed by natural selection to match habitat differences in reproductive success. First, we used long-term studies of life history and habitat selection in white-footed mice to illustrate that the fitness of females living in the forest is greater than that of females living in forest-edge habitat. Second, we used short-term foraging studies to evaluate whether food patches located in the forest provided more value to foragers than did those in the edge. Third, we used foraging studies and data on the occurrence of predators to demonstrate that animals foraging in areas with little cover face higher risks than when they forage in areas with more cover. We confirmed three a priori predictions: (1) Individual mice abandoned foraging patches at higher harvest rates in edge habitat than they did in forest. (2) Individuals harvested resource patches to lower quitting harvest rates under cover than they did when patches were located in the open. (3) The difference in quitting-harvest rate between ““open”” and ““covered”” patches was less in the safe forest habitat than it was in the risky edge habitat. Our results yield an impressive fit with our previous knowledge of habitat differences in reproductive success and substantiate the premise that short-duration strategic decisions by individuals match habitat differences in fitness. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecology Ecological Society of America

OPTIMALLY FORAGING MICE MATCH PATCH USE WITH HABITAT DIFFERENCES IN FITNESS

Ecology , Volume 81 (8) – Aug 1, 2000

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Publisher
Ecological Society of America
Copyright
Copyright © 2000 by the Ecological Society of America
Subject
Reports
ISSN
0012-9658
DOI
10.1890/0012-9658%282000%29081%5B2061:OFMMPU%5D2.0.CO%3B2
Publisher site
See Article on Publisher Site

Abstract

We tested the fundamental assumption of the ““optimality paradigm”” that the foraging behavior of individual organisms corresponds to what we would expect if it had been honed by natural selection to match habitat differences in reproductive success. First, we used long-term studies of life history and habitat selection in white-footed mice to illustrate that the fitness of females living in the forest is greater than that of females living in forest-edge habitat. Second, we used short-term foraging studies to evaluate whether food patches located in the forest provided more value to foragers than did those in the edge. Third, we used foraging studies and data on the occurrence of predators to demonstrate that animals foraging in areas with little cover face higher risks than when they forage in areas with more cover. We confirmed three a priori predictions: (1) Individual mice abandoned foraging patches at higher harvest rates in edge habitat than they did in forest. (2) Individuals harvested resource patches to lower quitting harvest rates under cover than they did when patches were located in the open. (3) The difference in quitting-harvest rate between ““open”” and ““covered”” patches was less in the safe forest habitat than it was in the risky edge habitat. Our results yield an impressive fit with our previous knowledge of habitat differences in reproductive success and substantiate the premise that short-duration strategic decisions by individuals match habitat differences in fitness.

Journal

EcologyEcological Society of America

Published: Aug 1, 2000

Keywords: fitness ; foraging ; giving-up density (GUD) ; habitat selection ; life history ; natural selection ; patch use ; Ontario ; Peromyscus; ; predation risk

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