Fluctuating selection
WebLowering the frequency of fluctuations makes selection more directional, and so heterozygosity declines. We also show that fluctuating selection raises dn / ds ratios for polymorphism, not only by sweeping selected alleles into the population, but also by purging the neutral variants of selected alleles as they undergo repeated bottlenecks. WebJan 12, 2010 · The best-known example of fluctuating selection driven by a known selective agent in a natural population is the change of beak shape in the large ground …
Fluctuating selection
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WebApr 17, 2024 · A growing number of studies suggest that selection may fluctuate over time and space, and that environmental changes may influence the strength, direction and form of sexual selection [ 17 – 22 ]. WebDec 20, 2024 · The fluctuating environment causes the selection coefficient of homozygotes to fluctuate randomly over time, with mean 0 and standard deviation 0.2. The frequency-dependent part of the model is as in Figure 2 , with parameter values (from left to right panel): and (no frequency dependence); and ; and ; and .
WebDec 11, 2024 · The fluctuating SNPs provide a clear indication of selection on individual loci, but we expect that selection on many loci to have diffuse ef fects on polymorphisms … WebJan 7, 2015 · The consequences of host-parasite coevolution are highly contingent on the qualitative coevolutionary dynamics: whether selection fluctuates (fluctuating selection …
WebApr 13, 2024 · The physical environment provides the very stage upon which the eco-evolutionary play unfolds. How environmental fluctuations affect fitness is thus central to demographic projections, selection predictions, life history analyses, and the conservation of populations. Modelling efforts have mostly dealt with fluctuating environments using … WebUsing long-term individual-based data for a wild rodent population, we quantify the magnitude of fluctuating selection on body size. Subsequently, we estimate the …
WebJan 1, 2010 · The multi-scale model of fluctuating selection is more general than the random-walk or displaced-optimum models, generates a correct description of …
WebJul 18, 2024 · Fluctuating selection: when the strength and/or direction of selection shifts over time. Frequency-dependent selection: wherefitness depends onthefrequency. the … cite them right softwareWebMay 9, 2007 · Under fluctuating Gaussian selection, the population is more likely to experience the concave portion of the fitness function when selection is stronger. … cite them right referencing tutorialWebMar 1, 2024 · Fluctuating selection must be strong to maintain a balanced polymorphism. The symmetric fluctuating selection model needs s > 2 / N and the random selection model needs σ α 1 − ρ α > 1 / N . Although the intensity of selection declines as the square root of the population size, we still need s > 0.0014 or σ α 1 − ρ α > 0.001 in a ... cite them right the open universityWebTang & Huang - Fluctuating selection on floral colour 845 used followed by Tukey- Kramer' s tests to analyse the effects of pollination treatments, gynoecium colour and water level … diane rick mortgage shelbyville inWebWithout the covariate in the model, a statistical test failed to detect significant density dependence in fluctuating kit fox abundances. However, when the covariate was added, strong density dependence was detected. According to an information-theoretic model-selection index, the model with both density dependence and rainfall is far superior ... cite them right them toolWebOct 30, 2024 · Seasonally fluctuating selection could potentially make a large contribution to maintaining genetic polymorphism in populations. However, … cite them right templateWebA mean phenotype that closely tracks movements of the optimum (via evolution or phenotypic plasticity) can thus buffer the influence of a fluctuating optimum on selection ( 28, 29 ). Fig. 1. Selection in the moving optimum model. cite them right uni of liverpool