Synergistic effects of kinship, sex and rank in the behavioural interactions of captive stump-tailed macaques.
In almost all non-human primate species kinship, sex and rank bias the patterning of interactions among subjects, seemingly in a way that favours the individual's fitness. A number of studies have been done in order to study separately the effects of these variables, concluding that an adequate model of interactions cannot be developed assuming preponderance of a single variable. The 'willingness' of one animal to interact with another can be explained as the result of assessing the possible outcomes (proximate and/or ultimate) of the interaction. The interrelationship of variables such as kinship, sex and rank, among others, provides the actors with a basis for deciding their rates of social interactions. The following study was done to assess whether kinship, rank and sex exerted independent, additive effects in the within-group distributions of eight social behaviour categories of captive groups of stump-tailed macaques. We found that the three variables synergistically affected the patterning of all behavioural categories. This suggests that the pay-offs of social interactions do not vary linearly, being intrinsically correlated with the actors' attributes so that uncertainty in the choice of a potential partner is minimized.
Instituto Mexicano de Psiquiatria, División de Neurociencias, D.F.
A M
AM
Santillán-Doherty
J L
JL
Diaz
R
R
Mondragón-Ceballos
D000374:Aggression; D000818:Animals; D001522:Behavior, Animal; D004291:Dominance-Subordination; D005260:Female; D016014:Linear Models; D008251:Macaca / Q000523:psychology*; D008297:Male; D012737:Sex Factors; D012726:Sexual Behavior, Animal; D012919:Social Behavior