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Errors in the Sex of Eggs Laid By the Solitary Bee Osmia r uFa (Megachilidae)

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From calculations based on cell lengths and the locations of cells in nests it was estimated that failures in fertilization of eggs of the solitary bee Osmia rufa resulted in 6% more adult males in the population. After adjustment the sex ratio was almost exactly par.

Affiliations: 1: Laboratório de Ecologia, Universidade de Brasilia, Brasilia, D.F., Brasil; 2: Hope Department of Entomology, University Museum, Oxford, England


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