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Sex Ratio Evolution Under Local Mate Competition in a Parasitic Wasp

John H. Werren
Evolution
Vol. 37, No. 1 (Jan., 1983), pp. 116-124
DOI: 10.2307/2408180
Stable URL: http://www.jstor.org/stable/2408180
Page Count: 9
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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 Evolution Under Local Mate Competition in a Parasitic Wasp
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Abstract

The parasitic wasp, N. vitripennis, is an excellent organism for testing sex ratio theory because it encounters a range of mating structures in nature, from sibling mating to panmixia in large populations. Both laboratory and field data are presented which quantitatively support Hamilton's prediction that as the number of foundresses contributing progeny to a local mating population increases, the sex ratio among progeny should shift from a female bias toward a 50:50 sex ratio.

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