Alouatta pigra males ignore A. palliata loud calls: A case of failed rival recognition?
Am J Phys Anthropol
; 166(2): 433-441, 2018 06.
Article
em En
| MEDLINE
| ID: mdl-29484643
ABSTRACT
OBJECTIVES:
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.METHODS:
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.RESULTS:
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.DISCUSSION:
Despite striking differences in vocalizations, A. palliata respond equally to calls from both species whereas A. pigra respond only to conspecifics. This apparent failure of A. pigra males to recognize interspecific rivals might have biased hybridization (F1 hybrids = male A. palliata x female A. pigra), a pattern previously hypothesized based on genetic analysis of hybrids. Given that A. pigra males could be losing reproductive opportunities to heterospecific males, our findings add to growing evidence of potential costs for overly specific species recognition.Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Vocalização Animal
/
Alouatta
Tipo de estudo:
Prognostic_studies
Limite:
Animals
País como assunto:
Mexico
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article