Abstract
Kin discrimination, the differential treatment of conspecifics based on kinship, occurs across the tree of life, from animals to plants to fungi to bacteria. When kin and nonkin interact, the ability to identify kin enables individuals to increase their inclusive fitness by helping kin, harming nonkin, and avoiding inbreeding. For a given species, the strength of selection for kin discrimination mechanisms is influenced by demographic, ecological, and life-history processes that collectively determine the scope for discrimination and the payoffs from kin-biased behavior. In this review, we explore how these processes drive variation in kin discrimination across taxa, highlighting contributions of recent empirical, comparative, and theoretical work to our understanding of when, how, and why kin discrimination evolves.
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