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According to the study, diversification is more likely to occur in deep lakes and in areas with relatively high solar radiation. By contrast, lake size has practically no influence on the likelihood of speciation -- which is surprising, as speciation in terrestrial species is known to depend in part on the available habitat area. Among the species-specific traits, the intensity of sexual selection (mate choice) was shown to be a key factor, as indicated by the association between sexual dichromatism (distinctive coloration of males and females) and diversification.