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Variance-effective population number: the effects of sex ratio and density on the mean and variance of offspring numbers in the flour beetle, Tribolium castaneum

Published online by Cambridge University Press:  14 April 2009

Michael J. Wade
Michael J. Wade
Affiliation:
Department of Biology, The University of Chicago, Chicago, Illinois 60637
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I report the results of an experimental study of the effects of sex ratio and density on the mean and variance in offspring numbers in both sexes of the flour beetle, Tribolium castaneum. The variance-effective number is estimated from the observed variance in offspring numbers using the methods of Crow & Morton (1955).

Both the mean and the variance in offspring numbers were found to vary with sex ratio and density; as was found in previous studies (Wade, 1980), males were generally more variable in offspring numbers than females. The ratio of variance to mean progeny numbers in each sex was approximately unity at all sex ratios.

Type
Research Article
Information
Genetics Research , Volume 43 , Issue 3 , June 1984 , pp. 249 - 256
Copyright
Copyright © Cambridge University Press 1984

References

REFERENCES

Cockerham, C. C. (1969). Variance of gene frequencies. Evolution 23, 72–84.CrossRefGoogle ScholarPubMed
Crow, J. F. & Kimura, M. (1970). Introduction to Population Genetics Theory. New York: Harper and Row.Google Scholar
Crow, J. F. & Morton, N. E. (1955). Measurement of gene frequency drift in small populations. Evolution 9, 202–214.CrossRefGoogle Scholar
Hamilton, W. D. (1967). Extraordinary sex ratios. Science 156, 477–488.CrossRefGoogle ScholarPubMed
Kimura, M. & Crow, J. F. (1963). The measurement of effective population number. Evolution 17, 279–288.CrossRefGoogle Scholar
Latter, B. D. H. (1959). Genetic sampling in a random mating population of constant size and sex ratio. Australian Journal of Biological Science 12, 500–505.CrossRefGoogle Scholar
McCauley, D. E. & Wade, M. J. (1981). The populational effects of inbreeding in Tribolium. Heredity 46, 59–67.CrossRefGoogle Scholar
Moran, P. A. P. & Watterson, G. A. (1959). The genetic effects of family structure in natural populations. Australian Journal of Biological Science 12, 1–15.CrossRefGoogle Scholar
Park, T., Mertz, D. B. & Petrusewicz, K. (1961). Genetic strains of Tribolium: their primary characteristics. Physiological Zoology 34, 62–80.CrossRefGoogle Scholar
Pollar, E. (1977). Effective population numbers and their interrelations. Proceedings of the Washington State University Conference on Biomathematics and Biostatistics of May 1974, 115–144.Google Scholar
Sokal, R. R. & Rohlf, F. J. (1981). Biometry. San Francisco: W. H. Freeman.Google Scholar
Wade, M. J. (1977 a). An experimental study of group selection. Evolution 31, 134–153.CrossRefGoogle ScholarPubMed
Wade, M. J. (1977 b). The effect of propagale sex ratio upon the number and sex ratio of the adults produced in a 37 day interval by Tribolium castaneum. Tribolium Information Bulletin 20, 144–145.Google Scholar
Wade, M. J. (1980). Effective population size: the effects of sex, genotype, and density on the mean and variance of offspring numbers in the flour beetle, Tribolium castaneum. Genetical Research 36, 1–10.CrossRefGoogle Scholar
Wade, M. J. (1982). Group selection: migration and the differentiation of small populations. Evolution 36, 949–961.CrossRefGoogle ScholarPubMed
Wade, M. J. & McCauley, D. E. (1980). Group selection: the phenotypic and genotypie differentiation of small populations. Evolution 34, 799–812.CrossRefGoogle Scholar
Wright, S. (1931). Evolution in Mendelian populations. Genetics 16, 97–159.CrossRefGoogle ScholarPubMed
Wright, S. (1938). Size of population and breeding structure in relation to evolution. Science 87, 430–431.Google Scholar