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4 results for “multilocus heterozygosity”
Data from: The quest for good genes: epigamic traits, fitness, MHC and multilocus heterozygosity in the guppy
<p><span>The "good genes" hypothesis for the evolution of male secondary sexual traits poses that female preferences for such traits are driven by indirect genetic benefits. However, support for the hypothesis remains ambiguous, and, in particular, the genetic basis for the benefits has rarely been investigated. Here, we use semi-natural populations of Trinidadian guppies to investigate whether sexually selected traits (orange, black and iridescent colouration, gonopodium length and body size) predict fitness measured as the number of grandoffspring, a metric that integrates across fitness components and sexes. Furthermore, we tested whether two potential sources of genetic benefits – major histocompatibility complex (MHC) genotypes and multilocus heterozygosity (MLH) – are significant predictors of fitness and of the size of sexually selected traits. We found a significant, non-linear effect of the area of black pigmentation and male body size on the number of grandoffspring, suggesting stabilising selection on black area, and non-linear selection favouring small body size. MLH was heritable (h<sup>2</sup> = 0.14) and significantly predicted the number of grandoffspring, indicating the potential for genetic benefits based on heterozygosity. We also found support for local heterozygosity effects, which may reflect a non-even distribution of genetic load across the genome. MHC genotype was not significantly associated with any tested fitness component, or with the load of <em>Gyrodactylus</em> parasites. Neither MHC nor MLH was a significant predictor of sexually selected traits. Overall, our results highlight the role of heterozygosity in determining fitness but do not provide support for male sexually selected traits being indicators of genetic quality. </span></p>
Data from: The quest for good genes: epigamic traits, fitness, MHC and multilocus heterozygosity in the guppy
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Data from: Evidence for an association between post-fledging dispersal and microsatellite multilocus heterozygosity in a large population of greater flamingos
Dispersal can be divided into three stages: departure, transience and settlement. Despite the fact that theoretical studies have emphasized the importance of heterozygosity on dispersal strategies, empirical evidence of its effect on different stages of dispersal is lacking. Here, using multi-event capture-mark-recapture models, we show a negative association between microsatellite multilocus heterozygosity (MLH; 10 loci; n = 1023) and post-fledging dispersal propensity for greater flamingos, Phoenicopterus roseus, born in southern France. We propose that the negative effects of inbreeding depression affects competitive ability and therefore more homozygous individuals are more likely to disperse because they are less able to compete within the highly saturated natal site. Finally, a model with the effect of MLH on propensity of post-fledgling dispersers to disperse to the long-distance sites of Africa was equivalent to the null model, suggesting that MLH had low to no effect on dispersal distance. Variations in individual genetic quality thus result in context-dependent heterogeneity in dispersal strategies at each stage of dispersal. Our results have important implications on fitness since sites visited early in life are known to influence site selection later on in life and future survival.
Data from: Evidence for an association between post-fledging dispersal and microsatellite multilocus heterozygosity in a large population of greater flamingos
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