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"Sex-Ratio" Trait, Sex Composition, and Relative Abundance in Drosophila pseudoobscura

Stephen H. Bryant, Andrew T. Beckenbach and Gary A. Cobbs
Evolution
Vol. 36, No. 1 (Jan., 1982), pp. 27-34
DOI: 10.2307/2407963
Stable URL: http://www.jstor.org/stable/2407963
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
"Sex-Ratio" Trait, Sex Composition, and Relative Abundance in Drosophila pseudoobscura
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Abstract

There are repeatable patterns from year to year in sex composition, the frequency of the "sex-ratio" (SR) trait, and the relative abundance of Drosophila pseudoobscura in southern California. The temperature pattern is also repeatable from year to year. Although sex composition cannot influence the frequency of SR, the frequency of SR can influence the sex composition and the growth rate of the population. These effects of SR may be shown by our data from a natural population.

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