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71 results for “fitness correlates”
Data from: Analysis of statistical correlations between properties of adaptive walks in fitness landscapes
The fitness landscape metaphor has been central in our way of thinking about adaptation. In this scenario, adaptive walks are an idealized dynamics that mimics the uphill movement of an evolving population towards a fitness peak of the landscape. Recent works in experimental evolution have demonstrated that the constraints imposed by epistasis are responsible for reducing the number of accessible mutational pathways towards fitness peaks. Here we exhaustively analyze the statistical properties of adaptive walks for two empirical fitness landscapes and for theoretical NK landscapes. Some general scenario can be drawn from our simulation study. Regardless the dynamics, we observe that the shortest paths are more regularly used. Although the accessibility of a given fitness peak is reasonably correlated to the number of monotonic pathways towards it, the two quantities are not exactly proportional. A negative correlation predictability and mean path divergence is established, and so with the decrease of the number of effective mutational pathways ensues the convergence of the attraction basin of fitness peaks. On the other hand, other features are not conserved among fitness landscapes, such as the relationship between accessibility and predictability.
Data from: No correlation between multi-locus heterozygosity and fitness in the common buzzard despite heterozygote advantage for plumage colour
Correlations between heterozygosity and fitness are frequently found but rarely well understood. Fitness can be affected by single loci of large effect which correlate with neutral markers via linkage disequilibrium, or as a result of variation in genome-wide heterozygosity following inbreeding. We explored these alternatives in the common buzzard, a raptor species in which three colour morphs differ in their lifetime reproductive success. Using 18 polymorphic microsatellite loci, we evaluated potential genetic differences among the morphs which may lead to subpopulation structuring and tested for correlations between three fitness-related traits and heterozygosity, both genome wide and at each locus separately. Despite their assortative mating pattern, the buzzard morphs were found to be genetically undifferentiated. Multilocus heterozygosity was only found to be correlated with a single fitness-related trait, infection with the blood parasite, Leucocytozoon buteonis, and this was via interactions with vole abundance and age. One locus also showed a significant relationship with blood parasite infection and ectoparasite infestation. The vicinity of this locus contains two genes, one of which is potentially implicated in the immune system of birds. We conclude that genome-wide heterozygosity is unlikely to be a major determinant of parasite burden and body condition in the polymorphic common buzzard.
FIG. 3 in Body Color and Morphological Correlates of Fitness in Eastern Fence Lizards (Sceloporus undulatus): A Spectrophotometric Approach
FIG. 3.—Significant regressions of abdominal body color against morphometric traits for female Eastern Fence Lizards (Sceloporus undulatus) collected in 2013 from Dauset Trails Nature Center (Butts County, GA). (A) Ventral UV chroma X snout-vent length (SVL), (B) ventral UV chroma X body condition, (C) ventral blue chroma X body condition, (D) dorsal hue X SVL, (E) dorsal UV chroma X SVL. Female dorsal hue was not normally distributed and did not normalize following transformation. Data for dorsal UV chroma were normalized using reciprocal transformations (see Methods), but the untransformed data are presented here for simplicity.
FIG. 2 in Body Color and Morphological Correlates of Fitness in Eastern Fence Lizards (Sceloporus undulatus): A Spectrophotometric Approach
FIG. 2.—Significant regressions of abdominal body color against morphometric traits for male Eastern Fence Lizards (Sceloporus undulatus) collected in 2013 from Dauset Trails Nature Center (Butts County, GA). (A) Ventral UV chroma X snout-vent length (SVL), (B) ventral blue chroma X SVL, (C) ventral blue chroma X patch area, (D) dorsal UV chroma X SVL. Values for UV chroma in panels A and D are depicted following a natural logarithmic transformation.
FIG. 1 in Body Color and Morphological Correlates of Fitness in Eastern Fence Lizards (Sceloporus undulatus): A Spectrophotometric Approach
FIG. 1.—Body coloration in adult Eastern Fence Lizards (Sceloporus undulatus) at 36°C. (A) Photographs of representative examples of male and female body color. (B) Mean spectral reflectance curves (males, n ¼ 28; females, n ¼ 12) of dorsal and ventral abdominal coloration. Solid brown line ¼ male dorsum; solid blue line ¼ male venter; dotted brown line ¼ female dorsum; dotted black line ¼ female venter. Spectral reflectance data from Stephenson et al. (2017). Republished with permission of the Linnean Society of London.
Correlation Between Quality of Life and Aerobic Physical Fitness of Patients With a Systemic Right Ventricle
ClinicalTrials.gov study NCT03379831. IPD Sharing: Not stated. Countries: 1. Publications: 2.
Data for: Effects of physical impairments on fitness correlates of the white-footed mouse, Peromyscus leucopus
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Data from: Exploring the mechanisms underlying a heterozygosity-fitness correlation for canine size in the Antarctic fur seal Arctocephalus gazella
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Data from: Heterozygosity-fitness correlations of conserved microsatellite markers in Kentish plovers Charadrius alexandrinus
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Data from: No correlation between multi-locus heterozygosity and fitness in the common buzzard despite heterozygote advantage for plumage colour
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Data from: Analysis of statistical correlations between properties of adaptive walks in fitness landscapes
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Data from: Heterozygosity-fitness correlations in a migratory bird: an analysis of inbreeding and single-locus effects
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Data from: Comparing the intersex genetic correlation for fitness across novel environments in the fruit fly, Drosophila serrata
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Data from: Body stores persist as fitness correlate in a long-distance migrant released from food constraints
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Data from: Heterozygosity-fitness correlation at the major histocompatibility complex despite low variation in Alpine ibex (Capra ibex)
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Data from: Local effects drive heterozygosity-fitness correlations in an outcrossing long-lived tree
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Data from: Using heterozygosity–fitness correlations to study inbreeding depression in an isolated population of white-tailed deer founded by few individuals
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Data from: Developmental instability is genetically correlated with phenotypic plasticity, constraining heritability, and fitness
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Data from: Inbreeding influences within-brood heterozygosity-fitness correlations (HFCs) in an isolated passerine population
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Data from: Heterozygosity-fitness correlations in a declining seabird population
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