Abstract # 40:

Scheduled for Thursday, August 17, 2006 03:30 PM-03:45 PM: Session 5 (Regency East #2) Oral Presentation


Prevalence and severity of limb malformations in the Japanese macaques (Macaca fuscata) of Awaji Island

S. E. Turner and L. M. Fedigan
University of Calgary, Department of Anthropology, 2500 University Dr. N.W., Calgary, Alberta T2N 1N4, Canada
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     High occurrence of congenital limb malformations (CLMs) has typified the Awajishima Monkey Center (AMC) provisioned population for nearly 40 years, however little is known about the relationships among severity of CLMs, survivorship and age-sex demographics after infancy. In 2004, we conduced a true-count census at AMC. Combining digital photography with descriptions and dye-marking to identify each individual, we then compared these data with existing AMC and published records on CLMs in this population [Nakamichi et al., 1997; Yoshihiro et al., 1979]. To estimate the severity of CLMs, we created an index that ranks individuals on a scale of 0-1 based on number of affected and absent limbs and digits, and impact on locomotion. Of the 199 monkeys censused, 34 individuals (17.1%) had CLMs. The severity of CLMs varied greatly (index range = 0.08 to 0.88, mean = 0.36), with consistent variation in severity across age-sex classes. There were no significant sex or age-class differences in the occurrence of CLMs (Chi-squared p>0.05). Although there were no disabled individuals older than 20 years, for adult females of known age, the ages of females with CLMs did not vary significantly from those of nondisabled females (Chi-squared p>0.05). Surprisingly then, CLMs may not have a large effect on adult survivorship; social and ecological factors may be mitigating the influence of CLMs in this population.