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• W1985706783 endingPage "810" @default.
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• W1985706783 abstract "Males of many polygynous animal species contribute nutrition, nest sites, parental care, or other material benefit to their mates in addition to their gametes. Variation in female reproductive success may be caused by variation in the quantity or quality of the male contribution, and in such cases a female's mate choice affects her reproductive success. I present here polygenic and haploid two-allele models for the joint evolution of a male secondary sexual trait and a female mating preference for that character. The male trait affects male survivorship, mating success, and the number of offspring produced per mating. A female's reproductive success is consequently affected by the type of male she mates. This selection on fecundity is assumed to operate in one of two ways. Under the assumption of limited male reproductive potential, the fecundity per mating is a declining function of the number of females to which a male is mated. Under the alternative assumption of unlimited male reproductive potential, the fecundity per mating is independent of the number of females mated, but does depend directly on the male's trait. The evolutionary equilibrium under both forms of fecundity selection is found to maximize immediate female reproductive success. The equilibrium, however, may or may not maximize male survivorship: when male reproductive potential is unlimited, the equilibrium for the male trait may lie far from the point that is optimal for male viability, and so average male survival can decrease under this form of sexual selection. The models also show that it is possible for the evolutionary equilibrium to become unstable, in which case the population will evolve rapidly away from the equilibrium in a maladaptive runaway process. These models address the sexy son hypothesis of Weatherhead and Robertson (1979), which contends that selection can create an equilibrium at which females on the average mate with certain attractive types of males that give them inferior material resources and therefore decrease the females' immediate reproductive success. The logic of this argument is that the females are compensated for their fecundity deficit by the mating success of their sons, which bear their fathers' genes and so are attractive to females. Results from the models developed here show that no such evolutionary balance is possible, and the sexy son hypothesis is not supported. Female fecundity is maximized at the evolutionary equilibrium, and is not offset against the fitness of descendants." @default.
• W1985706783 created "2016-06-24" @default.
• W1985706783 creator A5003885949 @default.
• W1985706783 date "1985-06-01" @default.
• W1985706783 modified "2023-10-01" @default.
• W1985706783 title "Evolution of Female Choice and Male Parental Investment in Polygynous Species: The Demise of the Sexy Son" @default.
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• W1985706783 doi "https://doi.org/10.1086/284380" @default.
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