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Networking ability a family trait in monkeys
Date:1/9/2013

DURHAM, N.C. -- Two years of painstaking observation on the social interactions of a troop of free-ranging monkeys and an analysis of their family trees has found signs of natural selection affecting the behavior of the descendants.

Rhesus macaques who had large, strong networks tended to be descendants of similarly social macaques, according to a Duke University team of researchers. And their ability to recognize relationships and play nice with others also won them more reproductive success.

"If you are a more social monkey, then you're going to have greater reproductive success, meaning your babies are more likely to survive their first year," said post-doctoral research fellow Lauren Brent, who led the study. "Natural selection appears to be favoring pro-social behavior."

The analysis, which appears Wednesday in Nature Scientific Reports, combined sophisticated social network maps with 75 years of pedigree data and some genetic analysis.

The monkeys are a free-ranging population of macaques descended from a 1938 release of monkeys from India on undeveloped 38-acre Cayo Santiago Island, off the eastern coast of Puerto Rico. They live in a natural setting with little human intervention other than food provisioning, but they do have university students watching them a lot of the time.

Field researchers who had learned to identify each of the nearly 90 monkeys on sight carefully logged interactions between individuals in 10-minute episodes over a two-year span. They compiled four or five hours of data per individual, logging grooming, proximity and aggression.

From that, the team built web-like network maps to analyze pro-social and anti-social interactions. They also looked at the maps for a measure they called "betweenness" -- the shortest paths between individuals -- and "eigenvector," a friends-of-friends measure that shows how many friends each friend of an individual has.

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Contact: Karl Leif Bates
karl.bates@duke.edu
919-681-8054
Duke University
Source:Eurekalert

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