Sex differences, sex ratios and sex roles
1994; Royal Society; Volume: 258; Issue: 1352 Linguagem: Inglês
10.1098/rspb.1994.0148
ISSN1471-2954
AutoresIan P. F. Owens, D. B. A. Thompson,
Tópico(s)Media, Gender, and Advertising
ResumoRestricted accessMoreSectionsView PDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmail Cite this article Owens Ian P. F. and Thompson Desmond B. A. 1994Sex differences, sex ratios and sex rolesProc. R. Soc. Lond. B.25893–99http://doi.org/10.1098/rspb.1994.0148SectionRestricted accessArticleSex differences, sex ratios and sex roles Ian P. F. Owens Google Scholar Find this author on PubMed Search for more papers by this author and Desmond B. A. Thompson Google Scholar Find this author on PubMed Search for more papers by this author Ian P. F. Owens Google Scholar Find this author on PubMed and Desmond B. A. Thompson Google Scholar Find this author on PubMed Published:22 November 1994https://doi.org/10.1098/rspb.1994.0148AbstractSexual selection theory predicts that sex roles will be determined by the operational sex ratio (OSR), the sex ratio among individuals searching for mates at any given time. There are two predictions: (i) the sex which is in 'excess' will be the more competitive sex with respect to access to mates; and (ii) the sex of which there is a 'shortage' will be the more choosy with respect to potential partners. We examine the second prediction and find that current OSR theory does not consider an important factor which affects mate choice. This factor is sex differences in variation in mate quality. Hence, we develop a new model of mate choice which shows that the parameter which should be optimized during mate choice is the trade-off between reproductive rate and mate quality. If mate choice is too lax, reproductive rate may be high but partners will be of low quality. If mate choice is too stringent, partners will be of high quality but reproductive rate will be low because such partners will be rare. Stringency of mate choice is, therefore, a facet of OSR theory. Indeed, our model shows that OSR theory can be used to integrate the effect of sex differences in both mating rate and variation in mate quality to predict the direction of mate choice. Our model suggests that: (i) mate choice is only selected when individuals of the opposite sex vary in their quality as mates; (ii) if the extent of variation in mate quality is equal within each sex, the sex with the lower potential mating rate will be the more choosy sex; but (iii) if there is sufficiently greater variation in mate quality among the sex with the lower potential reproductive rate, the sex with the higher potential mating rate will be the more choosy sex. Additionally, this approach demonstrates that competition and choice need not necessarily be opposite sex roles, as is commonly assumed. This is because subtly different forms of the OSR are used to predict competitive and choosy behaviour, respectively.FootnotesThis text was harvested from a scanned image of the original document using optical character recognition (OCR) software. As such, it may contain errors. Please contact the Royal Society if you find an error you would like to see corrected. Mathematical notations produced through Infty OCR. Next Article VIEW FULL TEXT DOWNLOAD PDF FiguresRelatedReferencesDetailsCited by Chevalier L, Labonne J, Galipaud M and Dechaume-Moncharmont F (2020) Fluctuating Dynamics of Mate Availability Promote the Evolution of Flexible Choosiness in Both Sexes, The American Naturalist, 10.1086/711417, 196:6, (730-742), Online publication date: 1-Dec-2020. 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