Stress‐induced assortative mating and the evolution of stress resistance

摘要: We show with a model that variation in environmental stress between generations facilitates the evolution of resistance through assortative mating. Stress induces delayed maturation susceptible phenotypes, segregating their fertile period from resistant phenotypes. Assortment mates enhances responsiveness populations to natural selection by inflating genetic variance. Thus, positive and inflated variance stressful environments can cause strong evolutionary increase resistance. By contrast, benign do not segregate random mating among phenotypes deflates variance, leading weaker response against resistance, assuming is costly. When vary randomly stressful, respond asymmetrically negative selection. This asymmetry (1) accelerates fixation allele if generally favoured (stressful more frequent) but delays loss it disfavoured (benign frequent), (2) push even when long-term costs modestly exceed benefits. alleles pleiotropically delay mating, stress-induced has complementary effects. Serial autocorrelation stressor amplifies these These results suggest novel mechanism for persistence polymorphisms.