Prieto, Guido I. (2025) Individuality and selection redux. [Preprint]
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Abstract
This review offers a critical examination of the relationship between individuality and natural selection. First, I challenge the widely held Individuality Assumption—the idea that an entity must be an individual to function as a unit of selection. Through a systematic analysis of the main concepts of units of selection and evolutionary individuals, I show that the Individuality Assumption is untenable: biological entities can play important evolutionary roles in the process of natural selection without qualifying as individuals in any significant sense. Second, I shed light on the conceptual and theoretical relationship between the debates on the units of selection and evolutionary individuality, which have largely grown independently and are often treated separately. Third, I contend that the relationship between individuality and selection is obscured by the tendency to construe evolutionary individuality in terms of evolvability. To overcome this problem, I propose an integrative framework that connects the different concepts of units of selection and evolutionary individuals with a philosophical account of individuality. This framework is visualized in the form of an Individuality Space that serves as a heuristic tool to further investigate the relationship between individuality and selection. I illustrate its utility by applying it to evolutionary transitions in individuality.
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| Item Type: | Preprint | ||||||
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| Additional Information: | Manuscript currently under review in The Quarterly Review of Biology (submitted December 21st, 2025) | ||||||
| Keywords: | biological individuality, Darwinian individuality, evolutionary individuality, evolutionary transitions in individuality, individuality space, levels of selection, organismality, units of selection | ||||||
| Subjects: | General Issues > Scientific Metaphysics Specific Sciences > Biology Specific Sciences > Biology > Evolutionary Theory General Issues > History of Philosophy of Science General Issues > Natural Kinds General Issues > Structure of Theories |
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| Depositing User: | Dr. Guido I. Prieto | ||||||
| Date Deposited: | 07 Feb 2026 19:24 | ||||||
| Last Modified: | 07 Feb 2026 19:24 | ||||||
| Item ID: | 28139 | ||||||
| Subjects: | General Issues > Scientific Metaphysics Specific Sciences > Biology Specific Sciences > Biology > Evolutionary Theory General Issues > History of Philosophy of Science General Issues > Natural Kinds General Issues > Structure of Theories |
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| Date: | 21 December 2025 | ||||||
| URI: | https://philsci-archive.pitt.edu/id/eprint/28139 |
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