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- W3136357021 abstract "Abstract Evolution by natural selection is often viewed as a process that inevitably leads to adaptation, or an increase in population fitness over time. However, maladaptation, an evolved decrease in fitness, may also occur in response to natural selection under some conditions. Social effects on fitness (or social selection) have been identified as a potential cause of maladaptation, but we lack a general rule identifying when social selection should lead to a decrease in population mean fitness. Here we use a quantitative genetic model to develop such a rule. We show that maladaptation is most likely to occur when social selection is strong relative to the nonsocial component of selection and acts in an opposing direction. In this scenario, evolutionary increases in traits that impose fitness costs on others may outweigh evolved gains in fitness for the individual, leading to a net decrease in population mean fitness. Further, we find maladaptation may also sometimes occur when phenotypes of interacting individuals negatively covary. We outline the biological situations where maladaptation in response to social selection can be expected, provide both quantitative genetic and phenotypic versions of our derived result, and suggest what empirical work would be needed to test it. We also consider the effect of social selection on inclusive fitness and support previous work showing that inclusive fitness cannot suffer an evolutionary decrease. Taken together, our results show that social selection may decrease population mean fitness when it opposes individual-level selection, even as inclusive fitness increases." @default.
- W3136357021 created "2021-03-29" @default.
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- W3136357021 date "2021-03-12" @default.
- W3136357021 modified "2023-10-17" @default.
- W3136357021 title "Social Selection and the Evolution of Maladaptation" @default.
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- W3136357021 doi "https://doi.org/10.1101/2021.03.12.435141" @default.
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