Abstract # 257:

Scheduled for Saturday, June 20, 2015 02:00 PM-02:15 PM: (Cascade H) Oral Presentation


IS THE SPATIAL STRUCTURE OF VERVET MONKEY (CHLOROCEBUS PYGERYTHRUS) TROOPS DETERMINED BY RANK AND SOCIAL INTEGRATION?

N. Josephs1,2, L. Barrett1,2 and P. Henzi1,2
1University of Lethbridge, 4401 University Drive West, Lethbridge, Alberta T1K 6T5, Canada, 2Applied Behavioural Ecology and Ecosystems Research Group, UNISA, South Africa
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     There are strong theoretical and empirical reasons to believe that more dominant and/or more socially integrated animals should occupy the spatial centre of social groups. We test this hypothesis using spatially explicit data collected from two free-ranging vervet monkey troops (Group size: PT=14; RBM=28). By deploying many data collectors simultaneously, we obtained 147 independent samples (NPT=74; NRBM=73) in which the GPS coordinates of all troop members were determined within a 10-minute window. After correcting for temporal offset, we identified the spatial centre for each sample and calculated each animal’s distance from it. We determined dominance from records of agonism and indexed social integration as directed network centrality, derived from grooming interactions. After standardisation, we ran a linear mixed model for adults of each sex, with individual identity as a random effect, and troop size, rank and social centrality as predictors of distance from the group centre. Despite moderate positive correlations between dominance rank and social centrality for males in both troops (rPT=0.79; rRBM=0.64) and females in one (rPT=0.74; rRBM=0.09), there was no indication that dominance or social centrality, or their interaction, underpinned spatial structure (Females: pRank=0.35, pCentrality=0.12, pRank*Centrality=0.19; R2=0.07. Males: pRank=0.92, pCentrality=0.55, pRank*Centrality=0.89; R2=0.03). There was no effect of troop size. We conclude that explanations for expressed spatial structure should be sought in habitat constraints and the dynamics of individual movement.