Biology – Quantitative Biology – Populations and Evolution
Scientific paper
2011-05-30
Biology
Quantitative Biology
Populations and Evolution
12 pages, 5 figures
Scientific paper
We consider a model for the evolution of cooperation in a population where individuals may have one of a number of different heritable and distinguishable traits or tags. Individuals interact with each of their neighbors on a square lattice by playing a one shot prisoner's dilemma game. The decision to cooperate or defect is contingent on each individual's perception of its opponent's tag. Unlike in other tag-based models individuals do not compare their own tag to that of their opponent. When perception is perfect the cooperation rate is substantially higher than in the usual spatial prisoner's dilemma game when the cost of cooperation is high. The enhancement in cooperation is positively correlated with the number of different tags. The more diverse a population is the more cooperative it becomes. When individuals start with an inability to perceive tags the population evolves to a state where individuals gain partial, but not perfect perception. The ability to perceive tags evolves to lower levels when the cost of cooperation is higher, with a corresponding higher rate of cooperation than would be the case if perception where perfect.
Bristow Tristen
Bunker Eric
Dreyer Alex
McAvity David
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