Tg. Barraclough et al., SEXUAL SELECTION AND TAXONOMIC DIVERSITY IN PASSERINE BIRDS, Proceedings - Royal Society. Biological Sciences, 259(1355), 1995, pp. 211-215
Many authors have suggested that sexual selection by female choice may
increase the speciation rate and hence generate taxonomic diversity.
Using sister taxa comparisons, we find a significant positive correlat
ion between the proportion of sexually dichromatic species within taxa
of passerine birds, and the number of species in those taxa. Theory p
redicts this result if sexual dichromatism in passerines has evolved t
hrough the action of female choice.