Grooming in Barbary macaques: better to give than to receive?

It is well established that grooming underpins sociality in group-living primates, and a number of studies have documented the stress-reducing effects of being groomed. In this study, we quantified grooming behaviour and physiological stress (assessed by faecal glucocorticoid analysis) in free-ranging Barbary macaques, Macaca sylvanus. Our results indicate that it is the giving rather than the receiving of grooming that is associated with lower stress levels. These findings shed important new light on the benefits of this key behaviour in primate social life.

[1]  Robin I. M. Dunbar.  Functional significance of social grooming in primates , 1991 .

[2]  D. Maestripieri.  Vigilance Costs of Allogrooming in Macaque Mothers , 1993, The American Naturalist.

[3]  Robert M. Seyfarth,et al.  Grooming, alliances and reciprocal altruism in vervet monkeys , 1984, Nature.

[4]  H. Kummer,et al.  Social Organization Of Hamadryas Baboons , 1968 .

[5]  Martin Reite,et al.  On the physiology of grooming in a pigtail macaque , 1989, Physiology & Behavior.

[6]  R. Palme,et al.  Comparison of different enzymeimmunoassays for assessment of adrenocortical activity in primates based on fecal analysis , 2006, American journal of primatology.

[7]  C. Wood,et al.  Pituitary-Adrenal Physiology during Pregnancy , 2001 .

[8]  D. Catanzaro,et al.  Psychogenic pregnancy disruptions in mammals , 1992, Neuroscience & Biobehavioral Reviews.

[9]  T. Ziegler,et al.  Hormonal correlates of reproductive seasonality in wild female Hanuman langurs (Presbytis entellus) , 2000, American journal of primatology.

[10]  F B de Waal,et al.  Heart rate responses to social interactions in free-moving rhesus macaques (Macaca mulatta): a pilot study. , 1999, Journal of comparative psychology.

[11]  R. A. Hill,et al.  Market forces predict grooming reciprocity in female baboons , 1999, Proceedings of the Royal Society of London. Series B: Biological Sciences.

[12]  T. P. Gordon,et al.  Relationship between Social Factors and Pituitary-Adrenocortical Activity in Female Rhesus Monkeys (Macaca mulatta) , 1993, Hormones and Behavior.

[13]  T. Rowell.  Social Behavior of Monkeys , 1973 .

[14]  B. Chapais,et al.  Aggressive interventions and matrilineal dominance relations in semifree-ranging barbary macaques (Macaca sylvanus) , 1993, Primates.

[15]  Robin I. M. Dunbar.  Primate social systems , 1987 .

[16]  P. Whitten,et al.  Behavioural and hormonal responses to predation in female chacma baboons (Papio hamadryas ursinus) , 2006, Proceedings of the Royal Society B: Biological Sciences.

[17]  J. Dittami,et al.  Patterns of anogenital swelling size and their endocrine correlates during ovulatory cycles and early pregnancy in free‐ranging barbary macaques (Macaca sylvanus) of Gibraltar , 2005, American journal of primatology.