PRIORITY OF ACCESS AND GROOMING PATTERNS OF FEMALES IN A LARGE AND A SMALL-GROUP OF OLIVE BABOONS

The theoretical basis of Seyfarth's priority of access model of female cercopithecine grooming was critically examined and alternative model s suggested. These models, named 'engagement', 'interference' and 'ran k difference', generated different predicted grooming distributions by assuming the operation of different constraints. These constraints we re, respectively, the time available for grooming, active interference on the part of higher ranked animals and a depression of grooming rel ations as rank difference between animals grew. These priority of acce ss models were compared with observed grooming patterns in two groups of free-ranging olive baboons, Papio cynocephalus anubis: one large, o ne small. The fit of these models was poor. An alternative method of e xamining the effects of rank on grooming behaviour using multiple regr ession was successful. In the small troop the rank of the groomee expl ained a significant amount of the variance in grooming whilst the rank distance between groomer and groomee did not. In the large troop the opposite effect was found. In the light of these results the merits of bottom-up modelling versus top-down description are discussed. The qu estion of group Size in primates and its relationship to social comple xity are addressed. (C) 1995 The Association for the Study of Animal B ehaviour