Abstract
The definition of biological individuality is one of the most discussed topics in philosophy of biology, but current debate has focused almost exclusively on evolution-based accounts. Moreover, several participants in this debate consider the notions of a biological individual and an organism as equivalent. In this paper, I show that the debates would be considerably enriched and clarified if philosophers took into account two elements. First, physiological fields are crucial for the understanding of biological individuality. Second, the category of biological individuals should be divided into two subcategories: physiological individuals and evolutionary individuals, which suggests that the notions of organism and biological individual should not be used interchangeably. I suggest that the combination of an evolutionary and a physiological perspective will enable biologists and philosophers to supply an account of biological individuality that will be both more comprehensive and more in accordance with scientific practices.
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Notes
This can be done both within biology and between biology and other scientific fields, e.g., physics (Guay and Pradeu 2016).
“Every living being is not a unity but a plurality”, quoted by Bernard (1974).
“Nutrition is the continuous mutation of the particles that constitute the living being” (what Bernard also calls “molecular renovation”).
Of course, developmental individuality can be explored for its own sake in extremely stimulating ways (e.g., Gottlieb 1992; Minelli 2011), but as soon as one conceives physiological individuality as concerning a unit of functioning from its beginning to its end, it includes the development of that unit.
It is even related to at least some understandings of biological individuality in ecology, where the focus is on understanding the nature and extent of interactions among constituent parts within an ecosystem (Huneman 2014).
In the second chapter of the book (“Physiology beyond the organism”), Turner (2000) says that the science studying these higher-level physiological units can be called “physiological ecology”, “ecophysiology”, or “environmental physiology” (p. 9). Later, he speaks of “superorganismal physiology” (p. 179). See also Seeley (1995), Sober and Wilson (1998).
For space reasons, I will not analyse here another concept that has been widely discussed, namely Griesemer’s (2000) concept of a reproducer.
Interestingly, some models of biological entities switching from a unicellular to a multicellular state can be useful to better explore this issue. For example, it has been shown that, when the multicellular stage (“slug”) of Dictyostelium discoideum is constituted, some cells specialize in an immune phagocytic activity (Chen et al. 2007), a question now explored by Queller and Strassmann, and others (Brock et al. 2016).
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Acknowledgments
I thank Leonardo Bich, Ellen Clarke, John Dupré, Marc Ereshefsky, Adam Ferner, Scott Gilbert, Peter Godfrey-Smith, Philippe Huneman, Richard Lewontin, Margaret McFall-Ngai, Maureen O’Malley, Alessandro Minelli, Makmiller Pedroso, and Elliott Sober for comments on previous drafts of this paper. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme–grant agreement n° 637647 – IDEM.
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Pradeu, T. Organisms or biological individuals? Combining physiological and evolutionary individuality. Biol Philos 31, 797–817 (2016). https://doi.org/10.1007/s10539-016-9551-1
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DOI: https://doi.org/10.1007/s10539-016-9551-1