Alouatta pigra males ignore A. palliata loud calls: A case of failed rival recognition?

American Journal of Physical Anthropology
Dawn M KitchenThore J Bergman

Abstract

When closely related species overlap geographically, selection may favor species-specific mate recognition traits to avoid hybridization costs. Conversely, the need to recognize potential same-sex rivals may select for lower specificity, creating the possibility that selection in one domain constrains evolution in the other. Despite a wealth of data on mate recognition, studies addressing rival recognition between hybridizing species are limited to a few bird species. Using naïve populations, we examine the extent to which failed rival recognition might have affected hybridization patterns when two species of howler monkeys (Alouatta pigra and A. palliata) first met after diverging in allopatry. We simulated first contact between naïve subjects using playback experiments in allopatric populations of the two purebred species. Using linear mixed models, we compared their look, move, and vocal responses to conspecific and heterospecific loud calls. Although not different in overall response strength to playbacks, the two species differed in reaction to heterospecific callers. Male A. pigra ignored calls from male A. palliata, but the reverse was not true. Despite striking differences in vocalizations, A. palliata respond equally t...Continue Reading

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Citations

Mar 6, 2021·American Journal of Primatology·Enrico CeccarelliPedro Américo D Dias

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