David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Ezio Di Nucci
Jack Alan Reynolds
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Biology and Philosophy 2 (4):397-414 (1987)
The concept of individuality as applied to species, an important advance in the philosophy of evolutionary biology, is nevertheless in need of refinement. Four important subparts of this concept must be recognized: spatial boundaries, temporal boundaries, integration, and cohesion. Not all species necessarily meet all of these. Two very different types of pluralism have been advocated with respect to species, only one of which is satisfactory. An often unrecognized distinction between grouping and ranking components of any species concept is necessary. A phylogenetic species concept is advocated that uses a grouping criterion of monophyly in a cladistic sense, and a ranking criterion based on those causal processes that are most important in producing and maintaining lineages in a particular case. Such causal processes can include actual interbreeding, selective constraints, and developmental canalization. The widespread use of the biological species concept is flawed for two reasons: because of a failure to distinguish grouping from ranking criteria and because of an unwarranted emphasis on the importance of interbreeding as a universal causal factor controlling evolutionary diversification. The potential to interbreed is not in itself a process; it is instead a result of a diversity of processes which result in shared selective environments and common developmental programs. These types of processes act in both sexual and asexual organisms, thus the phylogenetic species concept can reflect an underlying unity that the biological species concept can not
|Keywords||Species concepts individuality pluralism monophyly cladistics phylogeny|
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Citations of this work BETA
Massimo Pigliucci (2003). Species as Family Resemblance Concepts: The (Dis-)Solution of the Species Problem? Bioessays 25 (6):596-602.
Marc Ereshefsky (2010). Microbiology and the Species Problem. Biology and Philosophy 25 (4):553-568.
Roberta L. Millstein (2009). Populations as Individuals. Biological Theory 4 (3):267-273.
Richard Boyd (2010). Homeostasis, Higher Taxa, and Monophyly. Philosophy of Science 77 (5):686-701.
Mohan Matthen (2002). Origins Are Not Essences in Evolutionary Systematics. Canadian Journal of Philosophy 32 (2):167 - 181.
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