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Multilevel and kin selection in a connected world

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A Brief Communications Arising to this article was published on 18 February 2010

Abstract

Arising from: G. Wild, A. Gardner & S. A. West Nature 459, 983–986 (2009)10.1038/nature08071; Wild, Gardner & West reply

Wild et al.1 argue that the evolution of reduced virulence can be understood from the perspective of inclusive fitness, obviating the need to evoke group selection as a contributing causal factor. Although they acknowledge the mathematical equivalence of the inclusive fitness and multilevel selection approaches, they conclude that reduced virulence can be viewed entirely as an individual-level adaptation by the parasite1. Here we show that their model is a well-known special case of the more general theory of multilevel selection, and that the cause of reduced virulence resides in the opposition of two processes: within-group and among-group selection. This distinction is important in light of the current controversy among evolutionary biologists in which some continue to affirm that natural selection centres only and always at the level of the individual organism or gene, despite mathematical demonstrations that evolutionary dynamics must be described by selection at various levels in the hierarchy of biological organization.

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Wade, M., Wilson, D., Goodnight, C. et al. Multilevel and kin selection in a connected world. Nature 463, E8–E9 (2010). https://doi.org/10.1038/nature08809

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