Abstract
AbstractSome fundamental contrasts underlying the disputes about species concepts are outlined: nominalistic versus essentialistic viewpoints, relations of pattern and process, and incongruities of population genetic, ecological, and phylogenetic approaches. The biological, evolutionary and phylogenetic species concepts are briefly characterized. Attention is drawn to the cohesion concept of species and to genealogical concordance principles, which attempt to integrate elements of those concepts with advances in population biological and evolutionary genetic theory.
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