A hierarchy of species concepts: the denouement in the saga of the species problem

In M. F. Claridge, H. A. Dawah & M. R. Wilson (eds.), Species: The units of diversity,. Chapman & Hall. pp. 381–423 (1997)
At least 22 concepts of species are in use today and many of these are notably incompatible in their accounts of biological diversity. Much of the traditional turmoil embodied in the species problem ultimately derives from the packaging of inappropriate criteria for species into a single concept. This results from a traditional conflation of function of concepts with their applications, definitions with concepts, taxonomic categories with groups, and the ontological status of real species with teleological approaches to recover them. Analogous to classifications of supraspecific taxa, our forging inappropriate and ambiguous information relating to theoretical and operational discussions of species ultimately results in a trade-off between convenience, accuracy, precision, and the successful recovery of natural biological diversity. Hence, none of these expectations or intentions of species or classifications is attainable through composite, and possibly discordant, concepts of biological diversity or its descent. Reviewing and evaluating the concepts of species for their theoretical and operational qualities illustrates that a monistic, primary concept of species, applicable to the various entities believed to be species, is essential. This evaluation reveals only one theoretical concept as appropriate for species, the Evolutionary Species Concept. This conceptualization functions as a primary concept and is essential in structuring our ideas and perceptions of real species in the natural world. The remaining concepts are secondary, forming a hierarchy of definitional guidelines subordinate to the primary concept, and are essential to the study of species in practice. Secondary concepts should be used as operational tools, where appropriate, across the variance in natural diversity to discover entities in accord with the primary concept. Without this theoretical and empirical structuring of concepts of species our mission to achieve reconciliation and understanding of pattern and process of the natural world will fail.
Keywords Species  Monism
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On the Nature of the Species Problem and the Four Meanings of 'Species'.Thomas A. C. Reydon - 2005 - Studies in History and Philosophy of Science Part C 36 (1):135-158.
The Species Problem and its Logic: Inescapable Ambiguity and Framework-Relativity.Steven James Bartlett - 2015 - Willamette University Faculty Research Website, ArXiv.Org, and Cogprints.Org.
The Species Problem and History.Phillip R. Sloan - 2013 - Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences 44 (2):237-241.

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