Sexually selected traits predict patterns of species richness in a diverse clade of suboscine birds.
Whether sexual selection acts as an "engine of speciation" is controversial. Some studies suggest that it promotes the evolution of reproductive isolation, while others find no relationship between sexual selection and species richness. However, the explanatory power of previous models may have been constrained because they employed coarse-scale, between-family comparisons and used mating systems and morphological cues as surrogates for sexual selection. In birds, an obvious missing predictor...Expand abstract
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