An Evolutionarily Stable Strategy (ESS) is a strategy that, if adopted by a population, cannot be invaded by any alternative strategy that is initially rare. This concept arises from game theory and is essential for understanding how certain behaviors or traits become stable within a population over time. An ESS ensures that once a particular strategy is established, any deviation from it will not lead to a greater fitness compared to the established strategy, making it resistant to changes and maintaining its presence in the population.
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