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Effect of resource spatial correlation and hunter-fisher-gatherer mobility on social cooperation in Tierra del Fuego.

Santos JI, Pereda M, Zurro D, Álvarez M, Caro J, Galán JM, Briz i Godino I - PLoS ONE (2015)

Bottom Line: According to ethnographic sources, the Yamana developed cooperative behaviour supported by an indirect reciprocity mechanism: whenever someone found an extraordinary confluence of resources, such as a beached whale, they would use smoke signals to announce their find, bringing people together to share food and exchange different types of social capital.The model provides insight on how the spatial concentration of beachings and agents' movements in the space can influence cooperation.We conclude that the emergence of informal and dynamic communities that operate as a vigilance network preserves cooperation and makes defection very costly.

View Article: PubMed Central - PubMed

Affiliation: INSISOC, Universidad de Burgos, Escuela Politécnica Superior, Edif. "La Milanera", Burgos, Spain.

ABSTRACT
This article presents an agent-based model designed to explore the development of cooperation in hunter-fisher-gatherer societies that face a dilemma of sharing an unpredictable resource that is randomly distributed in space. The model is a stylised abstraction of the Yamana society, which inhabited the channels and islands of the southernmost part of Tierra del Fuego (Argentina-Chile). According to ethnographic sources, the Yamana developed cooperative behaviour supported by an indirect reciprocity mechanism: whenever someone found an extraordinary confluence of resources, such as a beached whale, they would use smoke signals to announce their find, bringing people together to share food and exchange different types of social capital. The model provides insight on how the spatial concentration of beachings and agents' movements in the space can influence cooperation. We conclude that the emergence of informal and dynamic communities that operate as a vigilance network preserves cooperation and makes defection very costly.

No MeSH data available.


Average amount of meat for cooperators and defectors.Average amount of meat for cooperators MC and defectors MD over a complete simulation run for two values of Pbw, and “random-walk” and “Lévy-flight8” movements. The spatial distributions of beached whales is uniform and θ = 10–1.5.
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pone.0121888.g010: Average amount of meat for cooperators and defectors.Average amount of meat for cooperators MC and defectors MD over a complete simulation run for two values of Pbw, and “random-walk” and “Lévy-flight8” movements. The spatial distributions of beached whales is uniform and θ = 10–1.5.

Mentions: Assuming Lévy flight movement, e.g. “Lévy-flight8” in Fig 8, the disappearance of the public-private discrepancy reveals the effects of vision on cooperation. When vision is low, a beached whale can be exploited almost exclusively, i.e. the probability of two or more agents finding a whale is quite low. This effect is readily observable in Fig 10, which depicts the average amount of meat M over a complete simulation run for defectors and cooperators. A defector gets high average M for low values of vision (v = 10), which is particularly significant with “Lévy-flight8” movement that reduces the public-private discrepancy. In contrast, a cooperator gets lower average meat M because she always calls and shares a beached whale, while a defector never calls.


Effect of resource spatial correlation and hunter-fisher-gatherer mobility on social cooperation in Tierra del Fuego.

Santos JI, Pereda M, Zurro D, Álvarez M, Caro J, Galán JM, Briz i Godino I - PLoS ONE (2015)

Average amount of meat for cooperators and defectors.Average amount of meat for cooperators MC and defectors MD over a complete simulation run for two values of Pbw, and “random-walk” and “Lévy-flight8” movements. The spatial distributions of beached whales is uniform and θ = 10–1.5.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4390331&req=5

pone.0121888.g010: Average amount of meat for cooperators and defectors.Average amount of meat for cooperators MC and defectors MD over a complete simulation run for two values of Pbw, and “random-walk” and “Lévy-flight8” movements. The spatial distributions of beached whales is uniform and θ = 10–1.5.
Mentions: Assuming Lévy flight movement, e.g. “Lévy-flight8” in Fig 8, the disappearance of the public-private discrepancy reveals the effects of vision on cooperation. When vision is low, a beached whale can be exploited almost exclusively, i.e. the probability of two or more agents finding a whale is quite low. This effect is readily observable in Fig 10, which depicts the average amount of meat M over a complete simulation run for defectors and cooperators. A defector gets high average M for low values of vision (v = 10), which is particularly significant with “Lévy-flight8” movement that reduces the public-private discrepancy. In contrast, a cooperator gets lower average meat M because she always calls and shares a beached whale, while a defector never calls.

Bottom Line: According to ethnographic sources, the Yamana developed cooperative behaviour supported by an indirect reciprocity mechanism: whenever someone found an extraordinary confluence of resources, such as a beached whale, they would use smoke signals to announce their find, bringing people together to share food and exchange different types of social capital.The model provides insight on how the spatial concentration of beachings and agents' movements in the space can influence cooperation.We conclude that the emergence of informal and dynamic communities that operate as a vigilance network preserves cooperation and makes defection very costly.

View Article: PubMed Central - PubMed

Affiliation: INSISOC, Universidad de Burgos, Escuela Politécnica Superior, Edif. "La Milanera", Burgos, Spain.

ABSTRACT
This article presents an agent-based model designed to explore the development of cooperation in hunter-fisher-gatherer societies that face a dilemma of sharing an unpredictable resource that is randomly distributed in space. The model is a stylised abstraction of the Yamana society, which inhabited the channels and islands of the southernmost part of Tierra del Fuego (Argentina-Chile). According to ethnographic sources, the Yamana developed cooperative behaviour supported by an indirect reciprocity mechanism: whenever someone found an extraordinary confluence of resources, such as a beached whale, they would use smoke signals to announce their find, bringing people together to share food and exchange different types of social capital. The model provides insight on how the spatial concentration of beachings and agents' movements in the space can influence cooperation. We conclude that the emergence of informal and dynamic communities that operate as a vigilance network preserves cooperation and makes defection very costly.

No MeSH data available.