A genetically explicit model of speciation by sensory drive within a continuous population in aquatic environments

摘要: The sensory drive hypothesis predicts that divergent adaptation in different habitats may lead to premating isolation upon secondary contact of populations. Speciation by has traditionally been treated as a special case speciation byproduct environments geographically isolated However, if are heterogeneous, local the systems cause emergence reproductively species from single unstructured population. In polychromatic fishes, visual sensitivity might become adapted ambient light regimes and influence female preferences for male nuptial color. this paper, we investigate possibility within initially We use models based on explicit genetic mechanisms color vision coloration. show simulations which adaptive evolution pigments perception explicitly modeled, can promote along short selection gradient continuous habitat assumed evolves adapt modal environment individuals experience females prefer mate with males whose they most sensitive to. our depends absorption spectra an individual's pigments. occurred frequently when steepness environmental was intermediate dispersal distance offspring relatively small. addition, results predict mutations large shifts wavelength peak speciation, whereas did not observe evolved stepwise small effect. suggest occur where gradients create modalities used choice. Evidence such exists several animal groups, freshwater marine fishes particular. probability population under conditions then critically depend architecture perceptual