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Journal of Ethology

, Volume 5, Issue 2, pp 165–172 | Cite as

Mate securing tactics and the cost of fighting in the Japanese horned beetle,Allomyrina dichotoma L. (Scarabaeidae)

  • Michael T. Siva-Jothy
Article

Abstract

Males of the horned beetleAllomyrina dichotoma L. show a bimodal frequency distribution with respect to horn size. The 2 morphs distinguished by this criteria showed different mate-securing tactics. Major males fought for possession of areas on oak trees that exuded sap. Fights escalated through a series of stereotyped encounters before entering the potentially damaging phase of close-quarter combat when the largest males in particular risked serious damage. Minor males, on the other hand, were never observed to fight with conspecific males, but retreated after making contact with them. Minor males arrived at sap sites earlier in the diurnal cycle than major males and so avoided them temporally as well as behaviourly. Minors appeared to be relatively as successful at gaining copulations as majors, but did so earlier in the diurnal cycle. Since females showed a slight tendency to remate on the same night, minors may lose fertilization opportunities if last male sperm precedence is high. Actual sperm precedence values are not know so the reproductive payoffs for the 2 morphs could not be assessed.

Keywords

Frequency Distribution Payoff Animal Ecology Diurnal Cycle 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. Alcock, J. 1979 The evolution of intraspecific diversity in male reproductive strategies in some bees and wasps. In: M. S. Blum & N. A. Blum (eds.)Sexual selection and reproductive competition in insects. pp. 381–402. Academic press, New York.Google Scholar
  2. Beebe, W. 1944 The function of the secondary sexual characters in two species of dynastine (Coleoptera).Zoologica 29: 53–57.Google Scholar
  3. Brown, L. & J. Bartalon 1986 Behavioural correlates of male morphology in a horned beetle.Am. Nat. 127: 565–570.Google Scholar
  4. Dawkins, R. 1980 Good strategy or evolutionary strategy? In: G. W. Barlow & J. Silverberg (eds.)Sociology: Beyond nature/nurture? Westiview, Boulder.Google Scholar
  5. Eberhard, W. G. 1979 The function of horns. In: M. S. Blum & N. A. Blum (eds.)Sexual selection and reproductive competition in insects. pp. 231–258. Academic press, New York.Google Scholar
  6. Eberhard, W. G. 1980 Horned beetles.Sci. Am. 242: 166–182.Google Scholar
  7. Eberhard, W. G. 1981 The natural history ofDoryphora sp. (Coleoptera, Chrysomelidae) and the function of its sternal horn.Ann. Entomol. Soc. Am. 74: 445–448.Google Scholar
  8. Eberhard, W. G. 1982 Beetle horn dimorphism: Making the best of a bad lot.Am. Nat. 119: 420–426.CrossRefGoogle Scholar
  9. Gadgil, M. 1972 Male dimorphism as a consequence of sexual selection.Am. Nat. 106: 574–580.Google Scholar
  10. Gwynne, D. T. 1984 Male mating effort, confidence of paternity, and insect sperm competition. In: R. L. Smith (ed.)Sperm competition and the evolution of animal mating systems. pp. 117–150. Academic press, New York.Google Scholar
  11. Hamilton, W. D. 1979 Wingless and fighting males in fig wasps and other insects. In: M. S. Blum & N. A. Blum (eds.)Sexual selection and reproductive competition in insects. pp. 167–220. Academic Press, New York.Google Scholar
  12. Mathieu, J. M. 1969 Mating behaviour of five species of Lucanidae (Coleoptera, Insecta).Can. Ent. 101: 1054–1062.Google Scholar
  13. Maynard-Smith, J. 1976 Evolution and the theory of games.Am. Sci. 64: 41–45.Google Scholar
  14. Obata, S. & T. Hidaka 1983 Recognition of opponent and mate in Japanese horned beetle,Allomyrina dichotoma L. (Coleoptera, Scarabaeidae).Kontyû Tokyo 51: 534–538.Google Scholar
  15. Otte, S. & K. Staymann 1979 Beetle horns: Some patterns in functional morphology. In: M. S. Blum & N. A. Blum (eds.)Sexual selection and reproductive competition in insects. pp. 259–292. Academic press, New York.Google Scholar
  16. Palmer, T. J. 1978 A horned beetle which fights.Nature 274: 583–584.CrossRefGoogle Scholar
  17. Parker, G. A. 1974 Assessment strategy and the evolution of fighting behaviour.J. Theor. Biol. 47: 223–243CrossRefPubMedGoogle Scholar
  18. Schlager, G. 1960 Sperm precedence in the fertilization of eggs inTribolium castaneum.Ann. Entomol. Soc. Am. 53: 557–560.Google Scholar
  19. Taylor, B. J. R. 1965 The analysis of polymodal frequency distributions.J. Anim. Ecol. 34: 445–452.Google Scholar
  20. Vick, K. W., W. E. Burkholder & B. J. Smittle 1972. Duration of mating refractory period and frequency of second matings in femaleTrogoderma inclusum (Coleoptera, Dermestidae).Ann. Entomol. Soc. Am. 65: 790–793.Google Scholar

Copyright information

© Japan Ethological Society 1987

Authors and Affiliations

  • Michael T. Siva-Jothy
    • 1
  1. 1.Faculty of AgricultureNagoya UniversityNagoyaJapan

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