David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
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Philosophy of Science 74 (1):69-95 (2007)
Philosophical discussions of species have focused on multicellular, sexual animals and have often neglected to consider unicellular organisms like bacteria. This article begins to fill this gap by considering what species concepts, if any, apply neatly to the bacterial world. First, I argue that the biological species concept cannot be applied to bacteria because of the variable rates of genetic transfer between populations, depending in part on which gene type is prioritized. Second, I present a critique of phylogenetic bacterial species, arguing that phylogenetic bacterial classification requires a questionable metaphysical commitment to the existence of essential genes. I conclude by considering how microbiologists have dealt with these biological complexities by using more pragmatic and not exclusively evolutionary accounts of species. I argue that this pragmatism is not borne of laziness but rather of the substantial conceptual problems in classifying bacteria based on any evolutionary standard.
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Citations of this work BETA
Marc Ereshefsky (2010). Darwin's Solution to the Species Problem. Synthese 175 (3):405 - 425.
Marc Ereshefsky (2010). Microbiology and the Species Problem. Biology and Philosophy 25 (4):553-568.
L. R. Franklin-Hall (2010). Trashing Life's Tree. Biology and Philosophy 25 (4):689-709.
Joel D. Velasco (2010). Species, Genes, and the Tree of Life. British Journal for the Philosophy of Science 61 (3):599-619.
Thomas A. C. Reydon (2009). Gene Names as Proper Names of Individuals: An Assessment. British Journal for the Philosophy of Science 60 (2):409-432.
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