Okasha, Samir
(2022)
Function in the Light of Frequency-Dependent Selection.
[Preprint]
Abstract
Christie et al. (2022) claim that the SE theory of function is premised on a simplistic view of evolution. In complex evolutionary scenarios, in particular those involving frequency-dependent selection (FDS), the SE theory fails, they argue, since citing a trait's SE function does not serve to explain why the trait exists. I argue that where FDS leads to a stable equilibrium, at which all individuals' trait values constitute a ``best response'' to the rest of the population, the SE theory can be straightforwardly applied. However matters are different if the evolutionary dynamics do not take the population to a stable equilibrium.
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