Advertisement

Researches on Population Ecology

, Volume 21, Issue 1, pp 81–104 | Cite as

Aspects of interspecific interaction betweenReithrodontomys megalotis andMicrotus montanus in one acre enclosures

  • Edward J. Pitcher
  • Barry L. Keller
Article

Summary

  1. 1.

    Two one acre enclosures were cleared of all resident rodents, and then, one enclosure was seeded with founder populations ofReithrodontomys megalotis (grid M) and the other withReithrodontomys megalotis plusMicrotus montanus (grid I). Founder populations consisted of eight animals for each species introduced and a sex ratio of 1∶1.

     
  2. 2.

    Five parameters were measured for a period of one year. Data collection was started in September 1971, and ended in September 1972; enumeration was conducted twice a month for three days.

     
  3. 3.

    The five parameters measured were: (1) population density through time and individual growth rates; (2) reproduction; (3) survival of age and sex classes; (4) sex ratio; and (5) sizes of home ranges.

     
  4. 4.

    There were no significant differences in three out of the five parameters studied. Density estimates along with individual growth rates were not significantly different between the grids. Reproduction, including breeding season and efficiency of reproductive effort, showed no or very little variation due to interspecific interaction. Home range sizes did not appear to be significantly different between the grids. Survival of juvenile males on grid I seemed lower and juvenile males from grid I were significantly smaller although possibly younger than those of grid M. The sex ratio of grid I was significantly different from the expected 1∶1 ratio.

     
  5. 5.

    It is postulated thatReithrodontomys megalotis may regulate their density by alteration of their sex ratios.

     

Keywords

Home Range Litter Size Home Range Size Interspecific Interaction Juvenile Male 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Literature Cited

  1. Asdell, S. A. (1964)Patterns of mammalian reproduction. 2nd ed. Comstock Publishing Associates, Ithaca, N. Y. 670 p.Google Scholar
  2. Bancroft, W. L. (1967) Record fecundity forReithrodontomys megalotis.J. Mammal. 48: 306–308.CrossRefGoogle Scholar
  3. Birkenholz, D. E. (1967) The harvest mouse (R. megalotis) in central Illinois.Ill. State Acad Sci. Trans. 60: 49–53.Google Scholar
  4. Brummel, C. N. (1961) Some aspects of the life history and ecology of the western harvest mouse in southeastern South Dakota.Proc. S. D. Acad. Sci. 40: 85–92.Google Scholar
  5. Catlett, R. H. andH. S. Shellhammer (1962) A comparison of behavioral and biological characteristics of house mice and harvest mice.J. Mammal. 43: 133–144.CrossRefGoogle Scholar
  6. Chitty, D. andH. Chitty (1962) Population trends among the voles at Lake Vyrnwy, 1923–60.Symp. Theriologicum. Brno, 1960. p. 67–76.Google Scholar
  7. Conley, W. H. (1971) Behavior, demography, and competition inMicrotus longicaudus andM. mexicanus. Ph. D. Thesis, Texas Tech. Univ., Lubbock, Texas, 46 p.Google Scholar
  8. Dunaway, P. B. (1968) Life history and populational aspects of the eastern harvest mouse.Amer. Midl. Nat. 79: 48–67.CrossRefGoogle Scholar
  9. Fisher, R. A. (1958)The genetical theory of natural selection. 2nd revised ed. Dover, New York. 291 p. (originally published in 1929).Google Scholar
  10. Fisler, G. F. (1965) Adaptations and speciation in harvestmice of the marshes of San Francisco Bay.Univ. Calif. Publ. Zool. 77: 1–108.Google Scholar
  11. Fisler, G. F. (1971) Age structure and sex ratio in populations ofReithrodontomys.J. Mammal. 52: 653–662.CrossRefGoogle Scholar
  12. Grant, P. R. (1971) Experimental studies of competitive interaction in a two species system. III.Microtus andPeromyscus species in enclosures.J. Anim. Ecol. 40: 323–50.CrossRefGoogle Scholar
  13. Hall, K. andW. H. Newton (1946) The normal course of separation of the pubes in pregnant mice.J. Physiol. 104: 346–352.PubMedGoogle Scholar
  14. Hamilton, W. J., Jr. (1941) Reproduction of the field mouseMicrotus pennsylvanicus (Ord.).Cornell Univ. Agr. Exp. Sta. Mem. 237. 23 p.Google Scholar
  15. Hoffmann, R. S. (1958) The role of reproduction and mortality in population fluctuations of voles (Microtus).Ecol. Monogr. 28: 79–109.CrossRefGoogle Scholar
  16. Keller, B. L. andC. J. Krebs (1970) Microtus population biology III. Reproductive changes in fluctuating populations ofM. ochrogaster andM. pennsylvanicus in Southern Indiana, 1965–67.Ecol. Monogr. 40: 263–294.CrossRefGoogle Scholar
  17. Krebs, C. J. (1966) Demographic changes in fluctuating populations ofMicrotus californicus.Ecol. Monogr. 36: 239–273.CrossRefGoogle Scholar
  18. Krebs, C. J. (1972)Ecology; the experimental analysis of distribution and abundance. Harper and Row. New York. 694 p.Google Scholar
  19. Krebs, C. J., B. L. Keller andR. H. Tamarin (1969)Microtus Population Biology: Demographic changes in fluctuating populations ofM. orchrogaster andM. pennsylvanicus in southern Indiana.Ecology 50: 587–607.CrossRefGoogle Scholar
  20. Krebs, C. J., M. S. Gaines, B. L. Keller, J. H. Myers andR. H. Tamarin (1973) Population cycles in small rodents.Science 179: 35–41.PubMedCrossRefGoogle Scholar
  21. Lack, D. (1966) Population studies of birds. Claredon, Press. Oxford. 341 p.Google Scholar
  22. Lerass, H. J. (1938) Observations on the growth and behavior of harvest mice.J. Mammal. 19: 441–444.CrossRefGoogle Scholar
  23. Lidicker, W. Z. (1966) Ecological observations on a feral house mouse population declining to extinction.Ecol. Monogr. 36: 27–5.CrossRefGoogle Scholar
  24. Long, C. A. (1962) Records of reproduction for harvest mice.J. Mammal. 43: 103–104.CrossRefGoogle Scholar
  25. Metzgar, L. H. (1967) An experimental comparison of screech owl predation on resident and transient white-footed mice.J. Mammal. 48: 387–391.CrossRefGoogle Scholar
  26. Packard, R. L. (1963) An ecological study of the fulvous harvest mouse in eastern Texas.Amer. Midl. Nat. 79: 63–88.Google Scholar
  27. Pitcher, E. J. (1973) Aspects of interspecific, interaction betweenReithrodontomys megalotis andMicrotus montanus in one acre enclosures. MS Thesis, Idaho State University, Pocatello, Idaho. 57 p.Google Scholar
  28. Sokal, R. R. andF. J. Rohlf (1969)Biometry; the principles and practice of statistics in biological research. W. H. Freeman. San Francisco. 776 p.Google Scholar
  29. Svihla, R. D. (1931) Notes on desert and dusky harvest mice (Reithrodontomys megalotis megalotis andR. m. nigrescens).J. Mammal. 12: 363–365.CrossRefGoogle Scholar
  30. Zukerman, S. (1953) The breeding seasons of mammals in captivity.Proc. Zool. Soc. Lond. 122: 827–950.Google Scholar

Copyright information

© The Society of Population Ecology 1979

Authors and Affiliations

  • Edward J. Pitcher
    • 1
  • Barry L. Keller
    • 2
  1. 1.Peter Kiewitt Sons’ Co.SheridanUSA
  2. 2.Department of BiologyIdaho State UniversityPocatelloUSA

Personalised recommendations