Oecologia

, Volume 33, Issue 1, pp 115–126 | Cite as

A mechanism for resource allocation among sympatric heteromyid rodent species

  • Richard L. Hutto
Article

Summary

Laboratory feeding experiments were conducted with Dipodomys ordii and Perognathus flavus in an attempt to discover a mechanism which might result in seed size selection. There was no marked difference in the proportions of four seed types collected whether the rodents foraged in the presence or absence of one another. However, analysis of the variability in weight of each of the seed types collected by the two species showed that when alone, the larger kangaroo rat was less effective at harvesting all of a uniformly distributed mixture of seeds. When in the presence of one another both species could harvest enough of the mixed, uniformly distributed seed to coexist indefinitely, but when the food source was presented as four large clumps the kangaroo rat's foraging effectiveness increased tremendously so that the pocked mouse was almost entirely unable to harvest any seed. These data, in light of mobility differences between large and small heteromyids, suggest a mechanism whereby the larger, more mobile kangaroo rats forage for the most readily available (large or clumped) seeds over a relatively large area. The smaller pocket mice, by virtue of their relative efficiency in harvesting seeds can utilize the less detectable seeds which are energetically too demanding for the larger kangaroo rats to harvest. Behavioral dominance of the larger animals may help prevent the smaller from utilizing the most readily available seeds. The patterns of seed size and foraging site selection described in the literature may be easily accounted for by this difference in foraging strategy.

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References

  1. Bartholomew, G.A., Caswell, H.H.: Locomotion in kangaroo rats and its adaptive significance. J. Mammal. 32, 155–159 (1951)Google Scholar
  2. Blaustein, A.R., Risser, R.C.: Interspecific interactions between three sympatric species of kangaroo rats (Dipodomys). An. Behav. 24, 381–385 (1976)Google Scholar
  3. Brown, J.H.: Species diversity of seed-eating desert rodents in sand dune habitats. Ecology 54, 775–787 (1973)Google Scholar
  4. Brown, J.H.: Geographical ecology of desert rodents. In: Ecology and evolution of communities, pp. 315–341 (M.L. Cody, J.M. Diamond, eds.). Cambridge-London: Harvard 1975Google Scholar
  5. Brown, J.H., Grover, J.J., Davidson, D.W., Lieberman, G.A.: A preliminary study of seed predation in desert and montane habitats. Ecology 56, 987–992 (1975)Google Scholar
  6. Brown, J.H., Lieberman, G.A.: Resource utilization and coexistence of seed-eating desert rodents in sand dune habitats. Ecology 54, 788–797 (1973)Google Scholar
  7. Eisenberg, J.F.: The behavior of heteromyid rodents. Univ. Calif. Publ. Zool. 69, 1–100 (1963)Google Scholar
  8. Kenagy, G.J.: Daily and seasonal patterns of activity and energetics in a heteromyid rodent community. Ecology 54, 1201–1219 (1973)Google Scholar
  9. Lockard, R.B., Lockard, J.S.: Seed preference and buried seed retrieval of Dipodomys deserti. J. Mammal. 52, 219–221 (1971)Google Scholar
  10. MacArthur, R.H.: Geographical ecology: Patterns in the distribution of species. New York: Harper and Row 1972Google Scholar
  11. McNab, B.K.: Bioenergetics and the determination of home range size. Am. Naturalist 97, 133–140 (1963)Google Scholar
  12. Meserve, P.L.: Food relationships of a rodent fauna in a California coastal sage scrub community. J. Mammal. 57, 300–319 (1976)Google Scholar
  13. Oosting, H.: The study of plant communities. San Francisco: Freeman 1956Google Scholar
  14. Reichman, O.J.: Relation of desert rodent diets to available resources. J. Mammal. 56, 731–751 (1975)Google Scholar
  15. Reichman, O.J., Oberstein, D.: Selection of seed distribution types by Dipodomys merriami and Perognathus amplus. Ecology 58, 636–643 (1977)Google Scholar
  16. Rosenzweig, M.L.: Habitat selection experiments with a pair of coexisting heteromyid rodent species. Ecology 54, 111–117 (1973)Google Scholar
  17. Rosenzweig, M.L., Smigel, B., Kraft, A.: Patterns of food, space and diversity. In: Rodents in desert environments, pp. 241–267 (I. Prakash, P.K. Ghosh, eds.). The Hague: Junk 1975Google Scholar
  18. Rosenzweig, M.L., Sterner, P.W.: Population ecology of desert rodent communities: Body size and seed-husking as bases for heteromyid coexistence. Ecology 51, 217–224 (1970)Google Scholar
  19. Rosenzweig, M.L., Winakur, J.: Population ecology of desert rodent communities: Habitats and environmental complexity. Ecology 50, 558–572 (1969)Google Scholar
  20. Schmidt-Nielsen, K., Hainsworth, F.R., Murrish, D.E.: Counter-current heat exchange in the respiratory passages: Effect on water and heat balance. Resp. Physiol. 9, 263–276 (1970)Google Scholar
  21. Schoener, T.W.: Non-synchronous spatial overlap of lizards in patchy habitats. Ecology 51, 408–418 (1970)Google Scholar
  22. Schroder, G.O., Rosenzweig, M.L.: Perturbation analysis of competition and overlap in habitat utilization between Dipodomys ordii and Dipodomys merriami. Oecologia (Berl.) 19, 9–28 (1974)Google Scholar
  23. Smigel, B.W., Rosenzweig, M.L.: Seed selection in Dipodomys merriami and Perognathus penicillatus. Ecology 55, 329–339 (1974)Google Scholar
  24. Smith, C.F.: The fall food of brushfield pocket mice. J. Mammal. 23, 337–339 (1942)Google Scholar
  25. Sokal, R.R., Rohlf, F.J.: Biometry. San Francisco: Freeman 1969Google Scholar
  26. Whitford, W.G.: Temporal fluctuations in density and diversity of desert rodent populations. J. Mammal. 57, 351–369 (1976)Google Scholar

Copyright information

© Springer-Verlag 1978

Authors and Affiliations

  • Richard L. Hutto
    • 1
  1. 1.Department of Biological SciencesNorthern Arizona UniversityFlagstaffUSA

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