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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

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