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107 results for “assortative mating”
Data from: Assortative mating by flowering time and its effect on correlated traits in variable environments
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Data from: MHC class II assortative mate choice in European badgers (Meles meles)
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Data from: Effects of assortative mate choice on the genomic and morphological structure of a hybrid zone between two bird subspecies
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Data from: No evidence for size-assortative mating in the wild despite mutual mate choice in sex-role-reversed pipefishes
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Data from: Frequency-dependent and correlational selection pressures have conflicting consequences for assortative mating in a color-polymorphic lizard, Uta stansburiana
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Data from: Shared environmental effects bias phenotypic estimates of assortative mating in a wild bird
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Data from: Assortative mating frames establishment in a young island bird population
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Data from: Diet-based assortative mating through sexual imprinting
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Data from: Widespread positive but weak assortative mating by diet within stickleback populations
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Mutual mate choice and assortative mating in relation to a carotenoid-based color trait in blue tits
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Data from: The scale-of-choice effect and how estimates of assortative mating in the wild can be biased due to heterogeneous samples
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Data from: Developmental effects of visual environment on species-assortative mating preferences in Lake Victoria cichlid fish
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Data from: 'Prudent habitat choice': a novel mechanism of size-assortative mating
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Data from: Assortative mating and the maintenance of population structure in a natural hybrid zone
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Data from: The context dependence of assortative mating: a demonstration with conspecific salmonid populations
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Data from: Spatiotemporal segregation by migratory phenotype indicates potential for assortative mating in lake sturgeon
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Resource partitioning is not coupled with assortative mating in sympatrically divergent ricefish in a Wallacean ancient lake
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Data from: No evidence of positive assortative mating for genetic quality in fruit flies
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.
Data from: Assortative mating by colored ornaments in blue tits: space and time matter
Assortative mating is a potential outcome of sexual selection and estimating its level is important to better understand local adaptation and underlying trait evolution. However, assortative mating studies frequently base their conclusions on small numbers of individuals sampled over short periods of time and limited spatial scales even though spatiotemporal variation is common. Here, we characterized assortative mating patterns over 10 years in four populations of the blue tit (Cyanistes caeruleus), a passerine bird. We focused on two plumage ornaments—the blue crown and the yellow breast patch. Based on data for 1,657 pairs of birds, we found large interannual variation: assortative mating varied from positive to negative. To determine whether there was nonetheless a general trend in the data, we ran a within-study meta-analysis. It revealed that assortative mating was moderately positive for both ornaments. It also showed that mating patterns differed among populations, and especially between two neighboring populations that displayed phenotypic divergence. Our results therefore underscore that long-term studies are needed to draw broad conclusions about mating patterns in natural populations. They also call for studying the potential role of assortative mating in local adaptation and evolution of ornaments in both sexes in blue tits.
Data from: Experimental swap of Anopheles gambiae's assortative mating preferences demonstrates key role of X-chromosome divergence island in incipient sympatric speciation.
Although many theoretical models of sympatric speciation propose that genes responsible for assortative mating amongst incipient species should be associated with genomic regions protected from recombination, there are few data to support this theory. The malaria mosquito, Anopheles gambiae, is known for its sympatric cryptic species maintained by pre-mating reproductive isolation and its putative genomic islands of speciation, and is therefore an ideal model system for studying the genomic signature associated with incipient sympatric speciation. Here we selectively introgressed the island of divergence located in the pericentric region of the X chromosome of An. gambiae s.s. into its sister taxon An. coluzzii through 5 generations of backcrossing followed by two generations of crosses within the introgressed strains that resulted in An. coluzzii-like recombinant strains fixed for the M and S marker in the X chromosome island. The mating preference of recombinant strains was then tested by giving virgin recombinant individuals a choice of mates with X-islands matching and non-matching their own island type. We show through genetic analyses of transferred sperm that recombinant females consistently mated with matching island-type males thereby associating assortative mating genes with the X-island of divergence. Furthermore, full-genome sequencing confirmed that protein-coding differences between recombinant strains were limited to the experimentally swapped pericentromeric region. Finally, targeted-genome comparisons showed that a number of these unique differences were conserved in sympatric field populations, thereby revealing candidate speciation genes. The functional demonstration of a close association between speciation genes and the X-island of differentiation lends unprecedented support to island-of-speciation models of sympatric speciation facilitated by pericentric recombination suppression.
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OpenNeuro
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