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Individuality and selection redux

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
Creators:
CreatorsEmailORCID
Prieto, Guido I.guido.prieto@uni-bielefeld.de0000-0002-0072-8304
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
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
Date: 21 December 2025
URI: https://philsci-archive.pitt.edu/id/eprint/28139

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