Abstract
The rate of homosexual copulation has been defined as the ratio between the number of homosexual mountings and the total number of mountings (homo and heterosexual) performed by aTribolium castaneum male during a period of 30 min. In a laboratory population, the average rate when a number of males (m) and females (k×m) are tested together has been estimated in each of the six situations defined by m=2 and 10 and k=0.5, 1, and 2, k being the sex ratio among scored individuals. Good agreement was found between the observed rates of homosexual copulation and those expected assuming random contacts between pairs of individuals totally indiscriminate with respect to sex. The genetic properties of the trait have been investigated by means of a diallel analysis of six highly inbred lines derived from the same population and their F1 crosses. Significant general and specific combining ability effects were detected. When noninbred females were used for testing, the rate of homosexual copulation is expected to be higher for inbred than for noninbred males. This prediction, implying the existence of inbreeding depression for the trait, also was confirmed by the data.
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References
Aiken, R. B. (1981). The relationship between body weight and homosexual mounting inPalmacorixa nana Walley (Heteroptera: corixidae).Fla. Entomol. 64:267–271.
Boake, C. R. B. (1986). A method for testing adaptive hypotheses of mate choice.Am. Nat. 127:654–666.
Boake, C. R. B., and Wade, M. J. (1984). Populations of the red flour beetleTribolium castaneum (Coleoptera: Tenebrionidae) differ in their sensitivity to aggregation pheromones.Environ. Entomol. 13:1182–1185.
Faustíni, D. L., Burkholder, W. E., and Laub, R. J. (1981). Sexually dimorphic setiferous sex patch in the male red flour beetle,Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae): Site of aggregation pheromone production.J. Chem. Ecol. 7:465–480.
Gailey, D. A., Hall, J. C., and Siegel, R. W. (1985). Reduced reproductive success for a conditioning mutant in experimental populations ofDrosophila melanogaster.Genetics 111:795–804.
Graur, D., and Wool, D. (1982). Dynamics and genetics of mating behavior inTribolium castaneum (Coleoptera: Tenebrionidae).Behav. Genet. 12:161–179.
Griffing, B. (1956). Concept of general and specific combining ability in relation to diallel crossing systems.Austral. J. Biol. Sci. 9:463–493.
Levinson, H. Z., and Mori, K. (1983). Chirality determines pheromone activity in flour beetles.Naturwissenschaften 70:190–192.
Mathieu, J. (1967). Mating behaviour of five species of Lucanidae (Coleoptera: Insecta).Am. Zool. 7:206.
Rich, E. (1972). Homosexual behavior related to a melanic mutant inTribolium castaneum.Tribolium Inf. Bull. 15:97.
Rich, E. (1989). Homosexual behavior in three melanic mutants ofTribolium castaneum.Tribolium Inf. Bull. 29:99–101.
Ryan, M. F., and O'Ceallachain, D. P. (1976). Aggregation and sex pheromones in the beetleTribolium confusum.J. Insect Physiol. 22:1501–1503.
Sokoloff, A. (1974).The Biology of Tribolium, Vol. 2, Oxford University Press, Oxford.
Thornhill, R., and Alcock, J. (1983).The Evolution of Insect Mating Systems, Harvard University Press, Cambridge, Mass.
Wool, D. (1967). Some observations on mating frequencies inTribolium castaneum strains.Tribolium Inf. Bull. 10:182–186.
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Serrano, J.M., Castro, L., Toro, M.A. et al. The genetic properties of homosexual copulation behavior inTribolium castaneum: Diallel analysis. Behav Genet 21, 547–558 (1991). https://doi.org/10.1007/BF01066681
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DOI: https://doi.org/10.1007/BF01066681