Sexual Selection and Nonrandom Mating Patterns in Desert Anurans (Bufo woodhousei, Scaphiopus couchi, S. multiplicatus and S. bombifrons)

Copeia ◽  
1982 ◽  
Vol 1982 (2) ◽  
pp. 351 ◽  
Author(s):  
Bruce D. Woodward
Keyword(s):  
Sexual Selection ◽  
Nonrandom Mating ◽  
Mating Patterns ◽  
Bufo Woodhousei

The intrinsically dynamic nature of mating patterns and sexual selection

2014 ◽  
Vol 98 (4) ◽  
pp. 1047-1058 ◽  
Author(s):  
M. Cunha ◽  
A. Berglund ◽  
N. M. Monteiro
Keyword(s):  
Sexual Selection ◽  
Dynamic Nature ◽  
Mating Patterns

scholarly journals An investigation of MHC-dependent sexual selection in a free-living population of sheep

2020 ◽  
Author(s):  
Wei Huang ◽  
Jill G. Pilkington ◽  
Josephine M. Pemberton
Keyword(s):  
Sexual Selection ◽  
Mixed Models ◽  
Gene Clusters ◽  
Inbreeding Avoidance ◽  
Free Living ◽  
Mating Patterns ◽  
Disassortative Mating ◽  
Mhc Genes ◽  
Genome Wide ◽  
Polymorphic Gene

AbstractMHC genes are one of the most polymorphic gene clusters in vertebrates and play an essential role in adaptive immunity. There is evidence that sexual selection also plays a role in maintaining MHC diversity, but the specific mechanisms are controversial. In this study, we investigate evidence for non-random MHC-dependent mating patterns in a free-living population of Soay sheep. Using a large number of sheep diplotyped at the MHC class IIa region and genome-wide SNPs, together with field observations of consorts, we found sexual selection against one of eight haplotypes, C, in males at the pre-copulatory stage and sexual selection on female MHC heterozygosity acting in opposition directions at the pre- and post-copulatory stages. We also found disassortative mating at the post-copulatory stage, along with strong evidence of inbreeding avoidance at both stages. However, results from generalized linear mixed models suggest that the pattern of MHC-dependent disassortative mating could be a by-product of inbreeding avoidance. These results suggest that there is selection on the MHC at the pre- and post-copulatory stages, but that apparent disassortative mating with respect to the MHC may be driven by inbreeding avoidance.

scholarly journals Natural and sexual selection on many loci.

Genetics ◽  
1991 ◽  
Vol 127 (1) ◽  
pp. 229-255 ◽  
Author(s):  
N H Barton ◽  
M Turelli
Keyword(s):  
Sexual Selection ◽  
Linkage Disequilibrium ◽  
Natural Selection ◽  
Arbitrary Number ◽  
Indirect Selection ◽  
Weak Selection ◽  
Nonrandom Mating ◽  
Linkage Disequilibria ◽  
Female Preferences ◽  
Natural And Sexual Selection

Abstract A method is developed that describes the effects on an arbitrary number of autosomal loci of selection on haploid and diploid stages, of nonrandom mating between haploid individuals, and of recombination. We provide exact recursions for the dynamics of allele frequencies and linkage disequilibria (nonrandom associations of alleles across loci). When selection is weak relative to recombination, our recursions provide simple approximations for the linkage disequilibria among arbitrary combinations of loci. We show how previous models of sex-independent natural selection on diploids, assortative mating between haploids, and sexual selection on haploids can be analyzed in this framework. Using our weak-selection approximations, we derive new results concerning the coevolution of male traits and female preferences under natural and sexual selection. In particular, we provide general expressions for the intensity of linkage-disequilibrium induced selection experienced by loci that contribute to female preferences for specific male traits. Our general results support the previous observation that these indirect selection forces are so weak that they are unlikely to dominate the evolution of preference-producing loci.

scholarly journals Reproductive ecology of short and long-term mating: implications for sexual selection and life history theory

2020 ◽  
Author(s):  
Janko Mileta Međedović
Keyword(s):  
Sexual Selection ◽  
Life History ◽  
Reproductive Success ◽  
Life History Theory ◽  
Human Life ◽  
Reproductive Ecology ◽  
Mating Patterns ◽  
Number Of Children ◽  
Human Reproductive

Mating patterns are crucial for understanding selection regimes in current populations and highly implicative for sexual selection and life history theory. However, empirical data on the relations between mating and fitness-related outcomes in contemporary humans are lacking. In the present research we examined the sexual selection on mating (with an emphasis on Bateman’s third parameter – the association between mating and reproductive success) and life history dynamics of mating by examining the relations between mating patterns and a comprehensive set of variables which determine human reproductive ecology. We conducted two studies (Study 1: N=398, Mage=31.03; Study 2: N=996, Mage=40.81, the sample was representative for participants’ sex, age, region, and settlement size). The findings from these studies were mutually congruent and complementary. In general, the data suggested that short-term mating was unrelated or even negatively related to reproductive success. Conversely, long-term mating was positively associated with reproductive success and there were indices that the beneficial role of long-term mating is more pronounced in males, which is in accordance with Bateman’s third principle. Observed age of first reproduction fully mediated the link between long-term mating and number of children but only in male participants. There were no clear indications of the position of the mating patterns in human life history trajectories; however, the obtained data suggested that long-term mating has some characteristics of fast life history dynamics. Findings are implicative for sexual selection and life history theory in humans.

scholarly journals No evidence of positive assortative mating for genetic quality in fruit flies

2019 ◽  
Vol 286 (1912) ◽  
pp. 20191474
Author(s):  
Nathaniel P. Sharp ◽  
Michael C. Whitlock
Keyword(s):  
Sexual Selection ◽  
Assortative Mating ◽  
Genetic Variance ◽  
Genetic Load ◽  
Fruit Fly ◽  
Genetic Quality ◽  
Mating Patterns ◽  
Disassortative Mating ◽  
Deleterious Alleles ◽  
Positive Assortative Mating

In sexual populations, the effectiveness of selection will depend on how gametes combine with respect to genetic quality. If gametes with deleterious alleles are likely to combine with one another, deleterious genetic variation can be more easily purged by selection. Assortative mating, where there is a positive correlation between parents in a phenotype of interest such as body size, is often observed in nature, but does not necessarily reveal how gametes ultimately combine with respect to genetic quality itself. We manipulated genetic quality in fruit fly populations using an inbreeding scheme designed to provide an unbiased measure of mating patterns. While inbred flies had substantially reduced reproductive success, their gametes did not combine with those of other inbred flies more often than expected by chance, indicating a lack of positive assortative mating. Instead, we detected a negative correlation in genetic quality between parents, i.e. disassortative mating, which diminished with age. This pattern is expected to reduce the genetic variance for fitness, diminishing the effectiveness of selection. We discuss how mechanisms of sexual selection could produce a pattern of disassortative mating. Our study highlights that sexual selection has the potential to either increase or decrease genetic load.

Sign in / Sign up

Export Citation Format

Share Document