Sex equality can explain the unique social structure of hunter-gatherer bands

@article{Dyble2015SexEC,
  title={Sex equality can explain the unique social structure of hunter-gatherer bands},
  author={Mark Dyble and Gul Deniz Salali and Neil Chaudhary and Abigail Emma Page and D. Smith and J. Thompson and Lucio Vinicius and Ruth Mace and Andrea Bamberg Migliano},
  journal={Science},
  year={2015},
  volume={348},
  pages={796 - 798}
}
Friends and family? Evolutionary theory stresses the importance of living with kin, not least because they share some of our genes. Nevertheless, a large-scale assessment of contemporary hunter-gatherer societies has established a consistent pattern of unrelated individuals living together. Dyble et al. used a modeling approach to suggest that a possible answer to this conundrum is that cohabitation choices are being governed equally by men and women. Science, this issue p. 796 As human… 
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References

SHOWING 1-10 OF 32 REFERENCES
Co-Residence Patterns in Hunter-Gatherer Societies Show Unique Human Social Structure
TLDR
It is found that hunter-gatherers display a unique social structure where either sex may disperse or remain in their natal group, adult brothers and sisters often co-reside, and most individuals in residential groups are genetically unrelated, which suggests large social networks may help to explain why humans evolved capacities for social learning.
Hunter-Gatherer Inter-Band Interaction Rates: Implications for Cumulative Culture
TLDR
Interactions between same-sex adult dyads of Ache and Hadza hunter-gatherers living in multiple distinct residential bands are presented, showing high probabilities of cultural and cooperative interactions between randomly chosen adults and suggesting ritual relationships increase interaction rates more than kinship, and that affinal kin interact more often than dyads with no relationship.
Social Networks and Cooperation in Hunter-Gatherers
TLDR
The social networks of the Hadza, a population of hunter-gatherers in Tanzania, are characterized, showing that Hadza networks have important properties also seen in modernized social networks, including a skewed degree distribution, degree assortativity, transitivity, reciprocity, geographic decay and homophily.
To give and to give not: The behavioral ecology of human food transfers
  • M. Gurven
  • Psychology
    Behavioral and Brain Sciences
  • 2004
The transfer of food among group members is a ubiquitous feature of small-scale forager and forager-agricultural populations. The uniqueness of pervasive sharing among humans, especially among
Bernard Chapais: Primeval kinship. How pair-bonding gave birth to human society
The modern study of primate behavior has its roots in scientific traditions initiated by Kinji Imanishi in Japan and Sherwood Washburn in the United States. Both sought to understand the evolution of
High mobility explains demand sharing and enforced cooperation in egalitarian hunter-gatherers
TLDR
It is shown through a simulation model that demand-sharing families that continuously move between camps in response to their energy income are able to survive in unpredictable environments typical of hunter-gatherers, while non- sharing families and sedentary families perish.
Cooperative breeding in South American hunter–gatherers
  • K. HillA. Hurtado
  • Biology
    Proceedings of the Royal Society B: Biological Sciences
  • 2009
TLDR
Demographic and food acquisition data show that most breeding pairs can expect food deficits owing to foraging luck, health disabilities and accumulating dependency ratio of offspring in middle age, and that extra-pair provisioning may be essential to the evolved human life history.
Lethal Aggression in Mobile Forager Bands and Implications for the Origins of War
TLDR
Investigating lethal aggression in a sample of 21 mobile forager band societies derived systematically from the standard cross-cultural sample suggests that most incidents of lethal aggression among MFBS may be classified as homicides, a few others as feuds, and a minority as war.
The evolutionary origin of human hyper-cooperation.
TLDR
Because the human data fit this general primate pattern, the adoption of cooperative breeding by the authors' hominin ancestors also provides the most parsimonious explanation for the origin of human hyper-cooperation.
Inter‐group encounters and female transfer in mountain gorillas: Influence of group composition on male behavior
  • P. Sicotte
  • Biology
    American journal of primatology
  • 1993
TLDR
This paper examines the behaviors used by male gorillas to influence female choice during inter‐group encounters to confirm that there are advantages to male cooperation in gorillas and raises the question of why such cooperation does not occur more often.
...
...