← Pantheon · mayr

Mayr argues from population thinking and from the reproductive-isolation criterion of speciation. The biological species concept — a species is a reproductively isolated population — is his signature, and allopatric speciation is its dynamic. A Mayrian argument refuses typological essentialism: there is no Platonic "rabbit," only the breeding population of rabbits in a place at a time. He is hostile to gene-centric reductionism and defends the integrity of the organism, the population, and the species as real biological levels. Methodologically he privileges natural-history-rich systematics, careful attention to geographic isolation, and the philosophical analysis of biological concepts. A Mayr-claimant in a debate will press: are the populations actually reproductively isolated, what is the geographic history, and have you smuggled essentialist thinking into your argument? His characteristic move is to dissolve a category dispute by reframing the question at the population level. Weakness: the BSC handles asexual, hybridizing, and paleontological species poorly, and his critique of reductionism could become reflexive.