Modeling Trade-Offs Between Plant Fiber and Toxins: A Framework for Quantifying Risks Perceived by Foraging Herbivores: A framework for quantifying risks perceived by foraging herbivores

Meghan J. Camp, Lisa A. Shipley, Timothy R. Johnson, Jennifer Sorenson Forbey, Janet L. Rachlow, Miranda M. Crowell

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

When selecting habitats, herbivores must weigh multiple risks, such as predation, starvation, toxicity, and thermal stress, forcing them to make fitness trade-offs. Here, we applied the method of paired comparisons (PC) to investigate how herbivores make trade-offs between habitat features that influence selection of food patches. The method of PC measures utility and the inverse of utility, relative risk, and makes trade-offs and indifferences explicit by forcing animals to make choices between two patches with different types of risks. Using a series of paired-choice experiments to titrate the equivalence curve and find the marginal rate of substitution for one risk over the other, we evaluated how toxin-tolerant (pygmy rabbit Brachylagus idahoensis ) and fiber-tolerant (mountain cottontail rabbit Sylviagus nuttallii ) herbivores differed in their hypothesized perceived risk of fiber and toxins in food. Pygmy rabbits were willing to consume nearly five times more of the toxin 1,8-cineole in their diets to avoid consuming higher levels of fiber than were mountain cottontails. Fiber posed a greater relative risk for pygmy rabbits than cottontails and cineole a greater risk for cottontails than pygmy rabbits. Our flexible modeling approach can be used to (1) quantify how animals evaluate and trade off multiple habitat attributes when the benefits and risks are difficult to quantify, and (2) integrate diverse risks that influence fitness and habitat selection into a single index of habitat value. This index potentially could be applied to landscapes to predict habitat selection across several scales.

Original languageAmerican English
Pages (from-to)3292-3302
Number of pages11
JournalHistory Faculty Publications and Presentations
Volume96
Issue number12
DOIs
StatePublished - 1 Dec 2015

Keywords

  • Brachylagus idahoensis
  • equivalence point
  • fiber
  • marginal rate of substitution
  • method of paired comparisons
  • monoterpene
  • Mountain cottontail
  • Plant secondary metabolite
  • Pygmy rabbit
  • Sagebrush
  • Sylvilagus nuttallii

EGS Disciplines

  • Biology

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