• Publications
  • Influence
Social Bonds of Female Baboons Enhance Infant Survival
16 years of behavioral data are presented, which demonstrate that sociality of adult females is positively associated with infant survival, an important component of variation in female lifetime fitness. Expand
Strong and Consistent Social Bonds Enhance the Longevity of Female Baboons
It is shown that dominance rank and the quality of close social bonds have independent effects on the longevity of female chacma baboons (Papio hamadryas ursinus), and females who form stronger and more stable social bonds with other females live significantly longer than Females who form weaker and less stable relationships. Expand
The adaptive value of sociality in mammalian groups
  • J. Silk
  • Biology, Medicine
  • Philosophical Transactions of the Royal Society B…
  • 29 April 2007
What is known about the reproductive consequences of sociality for mammals is reviewed to reflect the difficulty of quantifying the cumulative effects of behavioural interactions on fitness and the lack of information about the nature of social relationships among individuals in most taxa. Expand
Chimpanzees are indifferent to the welfare of unrelated group members
Experimental tests of the existence of other-regarding preferences in non-human primates are presented and it is shown that chimpanzees (Pan troglodytes) do not take advantage of opportunities to deliver benefits to familiar individuals at no material cost to themselves, suggesting that chimpanzee behaviour is not motivated by other- Regarding preferences. Expand
Social relationships among adult female baboons (Papio cynocephalus) II. Variation in the quality and stability of social bonds
This work draws on data derived from a 16-year study of baboons living in seven different social groups in the Amboseli basin of Kenya to evaluate the quality and stability of social bonds among females, and demonstrates that the quality of social Bonds directly affects their stability. Expand
Social relationships among adult female baboons (papio cynocephalus) I. Variation in the strength of social bonds
Testing a number of predictions derived from kin selection theory about the strength of social bonds among adult female baboons suggests that social bonds play a vital role in females’ lives, and the ability to establish and maintain strong social bonds may have important fitness consequences for females. Expand
The benefits of social capital: close social bonds among female baboons enhance offspring survival
In a group of free-ranging baboons, Papio cynocephalus ursinus, the offspring of females who formed strong social bonds with other females lived significantly longer than the offspring who formed weaker social bonds, providing the first direct evidence that social relationships among female baboons convey fitness benefits. Expand
Kin Selection in Primate Groups
  • J. Silk
  • Psychology
  • International Journal of Primatology
  • 30 July 2002
Altruism poses a problem for evolutionary biologists because natural selection is not expected to favor behaviors that are beneficial to recipients, but costly to actors. The theory of kin selection,Expand
Female chacma baboons form strong, equitable, and enduring social bonds
Analyses of the pattern of associations, social interactions, coalitions, and aggression among chacma baboons (Papio hamadryas ursinus) in the Okavango Delta of Botswana over a 16-year periodExpand