Abstract # 52:

Scheduled for Thursday, June 20, 2013 04:00 PM-04:15 PM: Session 8 (San Geronimo Ballroom C) Oral Presentation


E. Nikitopoulos1 and M. Cords2
1New York Institute of Technology, Life Sciences Department, New York, NY 10023, USA, 2Columbia University, Department E3B, New York, NY
     Kin biased social behavior is reported to be common in cercopithecines, a result of female philopatry and a consequence of kin selection. Most information, however, comes from baboons, vervets and some macaques, while little is known about forest guenons. We investigated maternal kin bias in grooming and spatial association in wild, adult female blue monkeys (Cercopithecus mitis stuhlmannii) in the Kakamega Forest, Kenya. Our data set included 68 maternal kin dyads (r _> 0.0625) in 4-8 groups monitored over 5 years. Grooming was positively correlated to degree of maternal relatedness in 15 of 25 group-years (Kr tests, controlled for rank distance). Spatial association, while feeding and resting, also correlated positively with degree of maternal relatedness in 14 and 10 of 25 group-years, respectively. We explored variation in grooming kin bias by comparing grooming with kin to a random expectation for each female in each year. Kin bias was higher when subjects: (i) lived in groups with more adult females, (ii) groomed a smaller proportion of available females, or (iii) had fewer kin (multilevel mixed-effects linear regression). Kin bias appeared higher than what has been reported in macaque species with similar group composition. Unlike macaques, however, dominance rank did not affect kin bias. Overall, kin bias in blue monkey affiliative behavior fits within a general ceropithecine pattern, although rank effects appear to be minimal.