Abstract
Sex-allocation theory describes how parents should bias investment in sons and daughters when male and female offspring give different fitness returns[ 1 Charnov, E.L. (1982) The Theory of Sex Allocation, Princeton University Press Google Scholar ]. Often, studies of sex allocation are based on species where a mechanism influencing sex allocation is known to exist, for example haplodipoidy in some insects. Among birds, unusual physiological or genetic mechanisms of sex determination are not known; however, accumulating studies attribute skews to primary sex-ratio adjustment[ 2 Komdeur J et al. Extreme adaptive modification in sex ratio of the Seychelles warblers' eggs. Nature. 1997; 385: 522-525 Crossref Scopus (387) Google Scholar , 3 Ellegren H Gustafsson L Sheldon B.C Sex ratio adjustment in relation to paternal attractiveness in a wild bird population. Proc. Natl. Acad. Sci. U. S. A. 1996; 93: 11723-11728 Crossref PubMed Scopus (267) Google Scholar ].
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