Abstract # 82:

Scheduled for Thursday, June 21, 2012 07:00 PM-09:00 PM: Session 9 (Gardenia) Poster Presentation


A. Remer1, M. Patiño1, M. Ramsier1,2 and M. E. Glenn1,2
1Humboldt State University, Humboldt Center for Evolutionary Anthropology, Department of Anthropology, Arcata, California 95521, USA, 2Windward Islands Research and Education Foundation, Grenada, West Indies
     During the Atlantic African slave trade, a small number of West African mona monkeys, Cercopithecus mona, were transported to the Caribbean island of Grenada. While DNA analysis has shown that there is minimal genetic variation within the population, as well as the presence of island-specific haplotypes, the skeletal morphology is as yet unexamined. Thus, three-dimensional coordinates of 48 anatomical landmarks were collected from the crania of adult males (n=12) and females (n=12) using a MicroScribe MS-6G2X-SYS. Geometric morphometric analysis was performed using EVAN Toolbox v.1.1, with statistical analysis using R v.2.11.1. Generalized Procrustes analysis was followed by principal component analysis, yielding size and shape variables. A regression model was fit on shape using principal component scores, which captured 90% of the total variability, as independent terms. PC1 (F=20.5178, p<0.001), PC2 (F=46.8235, p<0.001) and PC3 (F=6.90, p<0.05) were found to be significant, while remaining components showed negligible shape differences between sexes. Sexual size differences, examined using log-transformed centroid sizes, were found to be highly significant (F=206.16, p<0.001). With 15.8% sexual size dimorphism between adults, Grenada monas exhibit similar patterns as mainland forms. Additionally, summary statistics of the majority (mean ± one standard deviation) of male (105.0±3.0) and female (88.3±3.2) skull lengths (mm) are quite consistent with published data on African populations. Further study is underway to explore cranial shape variation among island and mainland mona populations.