Oecologia

, Volume 76, Issue 3, pp 408–415

The effects of owl predation on the foraging behavior of heteromyid rodents

  • Joel S. Brown
  • Burt P. Kotler
  • Rosemary J. Smith
  • William O. WirtzII
Original Papers

DOI: 10.1007/BF00377036

Cite this article as:
Brown, J.S., Kotler, B.P., Smith, R.J. et al. Oecologia (1988) 76: 408. doi:10.1007/BF00377036

Summary

Researchers have documented microhabitat partitioning among the heteromyid rodents of the deserts of North America that may result from microhabitat specific predation rates; large/bipedal species predominate in the open/risky microhabitat and small/quadrupedal species predominate in the bush/safer microhabitat. Here, we provide direct experimental evidence on the role of predatory risk in affecting the foraging behavior of three species of heteromyid rodents: Arizona pocket mouse (Perognathus amplus; small/quadrupedal), Bailey's pocket mouse (P. baileyi; large/quadrupedal), and Merriam's kangaroo rat (Dipodomys merriami; large/bipedal). Both kangaroo rats and pocket mice are behaviorally flexible and able to adjust their foraging behavior to nightly changes in predatory risk. Under low levels of perceived predatory risk the kangaroo rat foraged relatively more in the open microhabitat than the two pocket mouse species. In response to the presence of barn owls, however, all three species shifted their habitat use towards the bush microhabitat. In response to direct measures of predatory risk, i.e. the actual presence of owls, all three species reduced foraging and left resource patches at higher giving up densities of seeds. In response to indirect indicators of predatory risk, i.e. illumination, there was a tendency for all three species to reduce foraging. The differences in morphology between pocket mice and kangaroo rats do appear to influence their behavioral responses to predatory risk.

Key words

Predation Desert rodents Habitat selection Optimal foraging Predatory risk 

Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • Joel S. Brown
    • 1
  • Burt P. Kotler
    • 1
  • Rosemary J. Smith
    • 1
  • William O. WirtzII
    • 1
  1. 1.Department of BiologyPomona CollegeClaremontUSA
  2. 2.Department of Biological SciencesUniversity of Illinois at ChicagoChicagoUSA
  3. 3.Blaustein Institute for Desert ResearchBen-Gurion UniversitySede BoqerIsrael
  4. 4.Department of Ecology and Evolutionary BiologyUniversity of ArizonaTucsonUSA

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