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Behavioral Ecology and Sociobiology

, Volume 4, Issue 3, pp 265–278 | Cite as

Reproductive behavior of the cactus fly, Odontoloxozus longicornis, male territoriality and female guarding as adaptive strategies

  • Robert L. Mangan
Article

Summary

  1. 1.

    Mating behavior in the cactus fly, Odontoloxozus longicornis Bigot, is investigated using a model modified from Parker (1974). Male territoriality at oviposition sites, repeated matings, and postcopulatory guarding behaviors are described for a population utilizing giant saguaro cacti (Carnega gigantea) in Pima County, Arizona. Observations of flies under varying physical conditions indicate that the males follow two general copulatory patterns. Under optimum conditions described in the report, when large areas of the cactus surface can be utilized, a territorial defense strategy is adapted by the larger males while males unable to hold territories search for females. When conditions restrict the movements of flies on the cactus surface, all males search for females in the refuges.

     
  2. 2.

    To attempt to explain the maintenance of mixed strategies in the populations, data were collected and analyzed by applying a modification of Parker's (1974) optimization model. This model assesses the success of a mating strategy in terms of a gain (G) to investment (I) ratio. Data in Table 1 include those factors identical for males employing either territorial or searching strategy. Table 2 includes factors that differ for the males employing either of the two strategies, and Tables 3 and 4 summarize the data and calculations applied to the optimization (G/I) model.

     
  3. 3.

    Avoidance of sperm displacement by intervening matings and increased fertility of females encountered are shown to be major advantages of territorial strategies. Higher investments in territorial defense and longer waiting times between females are hypothesized to be the factors that select against this strategy. Male territoriality in this species is hypothesized to have evolved as a more efficient means of postcopulatory guarding, a strategy described for several other dipteran species by Parker (1974). The harsh desert environment and lack of sympatric closely related species are discussed as factors that allow sexual selection to maintain a variable reproductive strategy in males of this species.

     

Keywords

Sexual Selection Mixed Strategy Mating Behavior Reproductive Strategy Large 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.

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References

  1. Emlen, S.T., Oring, L.W.: Ecology, sexual selection, and the evolution of mating systems. Science 197, 215–223 (1977)Google Scholar
  2. Fellows, D.P., Heed, W.B.: Factors affecting host plant selection in desert-adapted cactiphilic Drosophila. Ecology 53, 850–858 (1972)Google Scholar
  3. Heed, W.B., Starmer, W.T., Miranda, M., Miller, M.W., Pfaff, H.J.: An analysis of the yeast flora associated with cactiphilic Drosophila and their host plants in the Sonoran desert and its relationship temperate and trophical association. Ecology 57, 151–160 (1976)Google Scholar
  4. Kambysellis, M.P., Heed, W.B.: Studies of oogenesis in natural population of Drosophila. I. Relation of ovarian development and ecological habits of Hawaiian species. Am. Nat. 105, 31–49 (1971)Google Scholar
  5. King, R.C.: Ovarian development in Drosophila melanogaster. New York: Academic 1970Google Scholar
  6. Mangan, R.L.: Themira athabasca n.sp. (Diptera: Sepsidae) with a revised key to North American Themira and notes on the sexual morphology of sympatric species. Ann. Entomol. Soc. Am. 69, 1024–1028 (1976)Google Scholar
  7. Oldroyd, H.: The natural history of flies. New York: W.W. Norton 1964Google Scholar
  8. Olsen, L.E., Ryckman, R.E.: Studies on Odontoloxozus longicornis (Diptera; Neriidae). I. Life history descriptions of immature stages. Ann. Entomol. Soc. Am. 56, 454–469 (1963)Google Scholar
  9. Parker, G.A.: Sperm competition and its evolutionary effect on copula duration in the fly Scatophaga stercoraria. J. Insect Physiol. 16, 1303–1328 (1970a)Google Scholar
  10. Parker, G.A.: Sperm competition and its evolutionary consequences in the insecta. Biol. Rev. 45, 525–568 (1970b)Google Scholar
  11. Parker, G.A.: Courtship persistence and female-guarding as male time investment strategies. Behaviour 48, 157–183 (1974)Google Scholar
  12. Prout, T., Bündgaard, J.: The population genetics of sperm displacement. Genetics 85, 95–124 (1977)Google Scholar
  13. Ryckman, R.F., Olsen, L.E.: Studies on Odontoloxozus longicornis (Diptera: Neriidae). II. Distribution and ecology. Ann. Entomol. Soc. Am. 56, 470–472 (1963)Google Scholar
  14. Spieth, H.T.: Courtship behavior of endemic Hawaiian Drosophila. Univ. Texas Publ. 6615, 245–314 (1966)Google Scholar
  15. Trivers, R.L.: Parental investment and sexual selection. In: Sexual selection and the descent of man, 1871–1971. Campbell, B. (ed.), pp. 136–179. Chicago: Aldine 1972Google Scholar
  16. Williams, G.C.: Adaptation and natural selection. New Jersey: Princeton University 1966Google Scholar
  17. Wilson, E.O.: Sociobiology, the new synthesis. Cambridge, Massachusetts: Belknap 1975Google Scholar

Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • Robert L. Mangan
    • 1
  1. 1.Department of Ecology and Evolutionary BiologyUniversity of ArizonaTucsonUSA

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