title: Dynamical Structure of a Traditional Amazonian Social Network.
abstract: Reciprocity is a vital feature of social networks, but relatively little is known about its temporal structure or the mechanisms underlying its persistence in real world behavior. In pursuit of these two questions, we study the stationary and dynamical signals of reciprocity in a network of manioc beer (Spanish:chicha; Tsimane':shocdye') drinking events in a Tsimane' village in lowland Bolivia. At the stationary level, our analysis reveals that social exchange within the community is heterogeneously patterned according to kinship and spatial proximity. A positive relationship between the frequencies at which two families host each other, controlling for kinship and proximity, provides evidence for stationary reciprocity. Our analysis of the dynamical structure of this network presents a novel method for the study of conditional, or non-stationary, reciprocity effects. We find evidence that short-timescale reciprocity (within three days) is present among non- and distant-kin pairs; conversely, we find that levels of cooperation among close kin can be accounted for on the stationary hypothesis alone.
authors: Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, NM 87501, USA ; Department of Anthropology, Emory University, 1557 Dickey Drive, Atlanta, GA 30322, USA.
authors: Paul L
authors: PL
authors: Hooper
authors: Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, NM 87501, USA ; School of Informatics and Computing, Indiana University, 901 E 10th Street, Bloomington, IN 47408, USA.
authors: Simon
authors: S
authors: DeDeo
authors: Department of Anthropology, Emory University, 1557 Dickey Drive, Atlanta, GA 30322, USA.
authors: Ann E
authors: AE
authors: Caldwell Hooper
authors: Department of Anthropology, University of California Santa Barbara, Santa Barbara, CA 93106, USA.
authors: Michael
authors: M
authors: Gurven
authors: Department of Anthropology, University of New Mexico, MSC01-1040, Albuquerque, NM 87131, USA.
authors: Hillard S
authors: HS
authors: Kaplan
keywords: Tsimane’; cooperation; forager-horticulturalists; kinship; reciprocity; social networks; social systems; time-series analysis