Species are, at the same time, kinds and individuals: a causal argument based on an empirical approach to species identity
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After having reconstructed a minimal biological characterisation of species, we endorse an “empirical approach” based on the idea that it is the peculiar evolutionary history of the species at issue—its peculiar origination process, its peculiar metapopulation structure and the peculiar mixture and strength of homeostatic processes vis à vis heterostatic ones—that determines species’ identity at a time and through time. We then explore the consequences of the acceptance of the empirical approach in settling the individuals versus kinds dispute. In particular, while conceptual arguments have been proposed to show that species can be equally treated as individuals and kinds because mereology’s and set-theory’s languages are inter-translatable, we advance instead a causal argument to sustain the claim that each species is both a kind (i.e., a class whose members share some properties included in a cluster) and an individual (i.e., a whole made of parts).
KeywordsBiological species HPC kinds Species-individuals
We thank Ingo Brigandt, Kevin de Queiroz, Matthew Slater, and Achille Varzi for incisive feedback and suggestions. We also thank the anonymous reviewers for their stimulating feedback, and the audience at the EPILOG seminar (in particular Cristina Amoretti and Marcello Frixione) of the University of Genoa, Italy, where the ideas proposed in this article starting to take shape. We acknowledge the financial support of the Fundação para a Ciência e a Tecnologia (BIODECON R&D Project Grant PTDC/IVC-HFC/1817/2014). Davide Vecchi also acknowledges the financial support of the Fundação para a Ciência e a Tecnologia (Grant No. SFRH/BPD/99879/2014; Grant No. UID/FIL/00678/2019).
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