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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.


Related in: MedlinePlus

Public-private discrepancy in the imitations.Public-private discrepancy in the imitations for two values of Pbw, and “random-walk” and “Lévy-flight8” movements, measured as the average imitations I* over a complete simulation run in which there was any discrepancy between the public and the private strategies of the agent imitated. The spatial distributions of beached whales is uniform and θ = 10–1.5.
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pone.0121888.g009: Public-private discrepancy in the imitations.Public-private discrepancy in the imitations for two values of Pbw, and “random-walk” and “Lévy-flight8” movements, measured as the average imitations I* over a complete simulation run in which there was any discrepancy between the public and the private strategies of the agent imitated. The spatial distributions of beached whales is uniform and θ = 10–1.5.

Mentions: For low values of vision (v = 10), we see that the public-private discrepancy, which produced the emergence of unexpected cooperation when the movement was a random walk, decreases significantly (see the two first columns of plots in Fig 8). The higher diffusion capacity of Lévy flights {6, 8} increases the opportunities for detecting defectors, whose strategy now does take part in the selection process. To show this effect better, we have computed the average imitations I* in which there was any discrepancy between the public and private strategies of the agent imitated for a particular set of parameterisations (see Fig 9). Except of the limiting case v = 5 corresponding to high cooperation (see Fig 8), it seems clear that the more diffusive characteristic of Lévy flight reduces the discrepancy and consequently the abnormal levels of cooperation reached for low values of vision (v = 10).


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)

Public-private discrepancy in the imitations.Public-private discrepancy in the imitations for two values of Pbw, and “random-walk” and “Lévy-flight8” movements, measured as the average imitations I* over a complete simulation run in which there was any discrepancy between the public and the private strategies of the agent imitated. 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.g009: Public-private discrepancy in the imitations.Public-private discrepancy in the imitations for two values of Pbw, and “random-walk” and “Lévy-flight8” movements, measured as the average imitations I* over a complete simulation run in which there was any discrepancy between the public and the private strategies of the agent imitated. The spatial distributions of beached whales is uniform and θ = 10–1.5.
Mentions: For low values of vision (v = 10), we see that the public-private discrepancy, which produced the emergence of unexpected cooperation when the movement was a random walk, decreases significantly (see the two first columns of plots in Fig 8). The higher diffusion capacity of Lévy flights {6, 8} increases the opportunities for detecting defectors, whose strategy now does take part in the selection process. To show this effect better, we have computed the average imitations I* in which there was any discrepancy between the public and private strategies of the agent imitated for a particular set of parameterisations (see Fig 9). Except of the limiting case v = 5 corresponding to high cooperation (see Fig 8), it seems clear that the more diffusive characteristic of Lévy flight reduces the discrepancy and consequently the abnormal levels of cooperation reached for low values of vision (v = 10).

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.


Related in: MedlinePlus