sexual selection


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Related to sexual selection: natural selection

sexual selection:

see selectionselection.
In Darwinism, the mechanism of natural selection is considered of major importance in the process of evolution. Popular formulations sometimes envisage a struggle for existence in which direct competition for mates or for various factors in the environment (e.g.
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.

Sexual Selection

 

the particular form of natural selection distinguished by the evolutionary development of secondary sex characteristics. These characteristics include the bright nuptial plumage of many birds, including ducks and grouse, the dances of insects, the mating calls of birds, the fighting of male birds and mammals, the varied sound signals of males used to attract females, and the odoriferous glands of insects and mammals used for attracting the opposite sex. Prominent characteristics, such as coloration, develop chiefly in males. Females, especially during the reproductive period, are usually protected by appropriate behavior, coloration, and form.

The primary basis for sexual selection was the divergence in the identifying characteristics of males and females, which probably facilitated inbreeding of the same species and prevented crossbreeding with other species. Subsequently, individuals with more pronounced sexual characteristics attracted the opposite sex more easily and had the advantage in reproduction.

The ethological or behavioral mechanisms of isolation are partially affected by sexual selection. The course of sexual selection sometimes conflicts with other trends of natural selection. Genotypes that are preserved make reproduction more successful but do not increase the viability of the species as a whole. However, this does not justify contrasting sexual selection with natural selection or considering it an independent factor in evolution. Sexual selection was first suggested by C. Darwin in 1859 and later substantiated in 1871.

REFERENCES

Darwin, C. Proiskhozhdenie vidov putem estestvennogo otbora. In Soch, vol. 3. Moscow-Leningrad, 1939. (Translated from English.)
Darwin, C. Proiskhozhdenie cheloveka i polovoi otbor. In Soch., vol. 5. Moscow, 1953. (Translated from English.)
Shmal’gauzen, I. I. Problemy darvinizma, 2nd ed. Leningrad, 1969.

A. V. IABLOKOV

sexual selection

[¦seksh·ə·wəl si′lek·shən]
(evolution)
A special form of natural selection responsible for the evolution of traits that promote success in competition for mates.
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In the process of sexual selection, there is one way in which women may exercise a certain amount of volition.
The sexual selection gradient for gnathopod size of males in South Lake was not significant and had large standard errors (Table 2).
1979: Sexual selection and sexual dimorphism in the Amphibia.
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However, sexual body size dimorphism may have causes other than sexual selection. The differential mortality between the sexes may cause an apparent size dimorphism because of unequal age of the sexes [5].
Darwin (1874) made little provision for sexual selection in externally fertilizing aquatic invertebrates, arguing that the general lack of sexual dimorphism in these systems and their often sessile or sedentary lifestyles made them unlikely targets for the selective forces of mate choice or mating competition (see also Arnold, 1994: Levitan, 2005).
Rather, we are subject to inborn tendencies, which develop through the reciprocally influential forces of natural and sexual selection.