Abstract # 50:

Scheduled for Thursday, June 20, 2013 03:30 PM-03:45 PM: Session 8 (San Geronimo Ballroom C) Oral Presentation


K. Boose and F. J. White
University of Oregon, Eugene, OR 97403, USA
     Paternity in chimpanzees and bonobos is biased toward high-ranking males. Chimpanzee female proceptivity is influenced by male aggression and the alpha male bias in paternity may be the result of this constraint of female choice. Bonobo females can hold significant power positions, and therefore may be less constrained by male aggression. Data on mating behaviors and preference were recorded for 900 hours from 2011 and 2012 for bonobos at the Columbus zoo. All age and sex classes showed proceptive and receptive behaviors. Juvenile females were least effective at soliciting copulations from males (G=19.348, p<0.01). All age-sex classes were equally receptive and did not differ in their response to solicitations for copulations (G=8.313, p=0.140). Cycling females were most proceptive towards the dominant male (N=105 copulations, G=163.999, p< 0.001) and were most receptive towards the son of the alpha female (N=140 copulations, G=172.037, p<0.001). High-ranking females were only proceptive to the son of the alpha female when the alpha female was present (N=9). There were 21 observations of male sexual coercion against females. The son of the alpha female engaged in significantly more sexual coercion than other males (G=63.676, p<0.001). We conclude that bonobo females may be constrained in mate choice through the influence of higher ranking females that benefits their sons.