Correlates of male mating success in a lekking bird with male-male cooperation

Correlates of male mating success were examined in a population of long-tailed manakins, Chiroxiphia linearis, that included 270 colour-banded individuals. Long-tailed manakins have a lek mating system and male-male cooperation in courtship display. Multivariate analysis of behavioural variables indicated that female visitation correlated with the number of unison ‘toledo’ calls given by male partners. Given a female vist, copulatory success was correlated with the ‘butterfly’ display component of the dual-male dance. Both ‘toledo’ output and dance display differed significantly between perch-zones. Only six to eight partnerships in a local population of as many as 55 males per season performed call displays at a level (75–335 toledos per h) that was correlated with any female visitation. Data on crown plumage of female visitors suggested that younger females may have been less discriminating than were older females. The relationship between variance in mating success and the evolution of cooperative male display is discussed.

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