Abstract
The effects of a series of ecological and size factors on the degree of sexual dimorphism in body weight and canine size were studied among subsets of 70 primate species. Variation in body-weight dimorphism can be almost entirely attributed to body weight (83% of variance R2 of weight dimorphism). Much smaller amounts of the variation can be attributed to mating system (R2 =6.8%,polygynous species being more dimorphic than monogamous ones) and diet (R2 = 2.5%,frugivorous species being more dimorphic than folivorous ones). Habitat (arboreal vs. terrestrial) and activity rhythm (nocturnal vs. diurnal) have only an indirect effect on weight dimorphism. Variation in canine-size dimorphism can be explained in terms of canine size (R2 =49%),activity rhythm (R2 = 20%,diurnal species being more dimorphic than nocturnal ones), and mating system (R2 = 10%).Habitat and diet do not play a significant role in canine-size dimorphism. The unexpectedly high contribution of size to sexual dimorphism coupled with the observation of increased sexual dimorphism with increased size leads us to formulate a new selection model for the evolution of sexual dimorphism. We suggest that if there is selection for size increase, whatever its cause, directional selection in both males and females will lead to an increase in sexual dimorphism based on differences in genetic variance between the sexes. Sexual selection, resource division between the sexes, or lopsided reproductive selection need not play a role in such a model.
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References
Alexander, R. D., Hoogland, J. L., Howard, R. D., Noonan, K. M., and Sherman, P. W. (1979). Sexual dimorphism and breeding systems in pinnipeds, ungulates, primates and humans. In Chagnon, N. A., and Irons, W. (eds.),Evolutionary Biology and Human Social Behavior: An Anthropological Perspective, Duxbury Press, North Scituate, Mass., pp. 402–435.
Anderson, D., and Lydic, R. (1977). On the effect of using ratios in the analysis of variance.Biobehav. Rev. 1: 225–229.
Atchley, W., Gaskins, C., and Anderson, D. (1976). Statistical properties of ratios. I. Empirical results.Syst. Zool. 25: 137–148.
Bird, M., and Schaffer, H. (1972). A study of the genetic basis of sexual dimorphism for wing length inDrosophila melanogaster.Genetics 72: 475–487.
Blalock, H. (1972).Social Statistics, McGraw-Hill, New York.
Clutton-Brock, T. H. (1977). Some aspects of intraspecific variation in feeding and ranging behavior in primates. In Clutton-Brock, T. H. (ed.),Primate Ecology, Academic Press, London, pp. 539–556.
Clutton-Brock, T. H., and Harvey, P. H. (1977). Primate ecology and social organization.J. Zool. Lond. 183: 1–39.
Clutton-Brock, T. H., and Harvey, P. H. (1978). Mammals, resources and reproductive strategies.Nature (Lond.) 273:191–195.
Clutton-Brock, T. H., Harvey, P. H., and Rudder, B. (1977). Sexual dimorphism, socionomic sex ratio and body weight in primates.Nature (Lond.) 269: 797–800.
Crook, J. H. (1972). Sexual selection, dimorphism, and social organization in the primates. In Campbell, B. G. (ed.),Sexual Selection and the Descent of Man, 1871–1971, Aldine, Chicago, pp. 231–281.
Crook, J. H., and Gartlan, J. S. (1966). On the evolution of primate societies.Nature (Lond.) 210: 1200–1203.
Eisen, E., and Hanrahan, J. (1972). Selection for sexual dimorphism in body weight in mice.Aust. J. Biol. Sci. 25: 1015–1024.
Eisenberg, J. F., Muckenhirn, N. A., and Rudran, R. (1972). The relation between ecology and social structure in primates.Science 176: 863–874.
Falconer, D. (1960).An Introduction to Quantitative Genetics, Roland Press, New York.
Harvey, P. H., Kavanagh, M., and Clutton-Brock, T. H. (1978a). Sexual dimorphism in primate teeth.J. Zool. Lond. 276: 817–818.
Harvey, P. H., Kavanagh, M., and Clutton-Brock, T. H. (1978b). Canine tooth size in female primates.Nature (Lond.) 276: 817–818.
Huxley, J. (1932).Problems of Relative Growth, Dover, New York.
Lande, R. (1980). Sexual dimorphism, sexual selection, and adaptation in polygenic characters.Evolution 34: 292–307.
Leutenegger, W. (1973). Maternal-fetal weight relationships in primates.Folia Primatol. 20: 280–293.
Leutenegger, W. (1976). Metric variability in the anterior dentition of African colobines.Am. J. Phys. Anthropol. 45: 45–52.
Leutenegger, W. (1978). Scaling of sexual dimorphism in body size and breeding system in primates.Nature (Lond.) 272: 610–611.
Leutenegger, W. (1982). Scaling of sexual dimorphism in body weight and canine size in primates.Folia Primatol. 37: 163–176.
Leutenegger, W., and Kelly, J. T. (1977). Relationship of sexual dimorphism in canine size and body size to social, behavioral, and ecological correlates in anthropoid primates.Primates 18: 117–136.
Mairana, V. (1982). Size and the degree of sexual dimorphism: lopsided reproductive selection. In Heisler, P., and Eastman, C. (eds.),Behavioral and Morphological Aspects of Sexual Dimorphism in Primates, Plenum Press, New York (in press).
Rails, K. (1977). Sexual dimorphism in mammals: Avian models and unanswered questions.Am. Natur. 111: 917–938.
Raup, D. M. (1972). Approaches to morphologic analysis. In Schopf, T. J. M. (ed.),Models in Paleobiology, Freeman, San Francisco, pp. 28–44.
Rensch, B. (1950). Die AbhÄngigkeit der relativen Sexualdifferenz von der Körpergrösse.Bonn Zool. Beitr. 1: 58–69.
Rensch, B. (1954).Neuere Probleme der Abstammungslehre, Enke, Stuttgart.
Rosenberger, A. L. (1977).Xenothrix and ceboid phylogeny.J. Hum. Evol. 6: 461–481.
Rothenfluh, E. (1976).Ueberprüfung der Gewichtsangaben adulter Primaten im Vergleich zwischen Gefangenschafts- und Wildfangtieren, Diplomarbeit, UniversitÄt Zürich, Zürich.
Selander, R. K. (1972). Sexual selection and dimorphism in birds. In Campbell, B. G. (ed.),Sexual Selection and the Descent of Man, 1871–1971, Aldine, Chicago, pp. 180–230.
Swindler, D. R. (1976).Dentition of Living Primates, Academic Press, London.
Wilson, E. O. (1975).Sociobiology, Harvard University Press, Cambridge, Mass.
Wood, B. A. (1976). The nature and basis of sexual dimorphism in the primate skeleton.J. Zool. Lond. 180: 15–34.
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Leutenegger, W., Cheverud, J. Correlates of sexual dimorphism in primates: Ecological and size variables. Int J Primatol 3, 387–402 (1982). https://doi.org/10.1007/BF02693740
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DOI: https://doi.org/10.1007/BF02693740
