1Species : reality and concepts92Studying speciation553Allopatric and parapatric speciation834Sympatric speciation1255Ecological isolation1796Behavioral and nonecological isolation2117Postzygotic isolation2478The genetics of postzygotic isolation2839Polyploidy and hybrid speciation32110Reinforcement35311Selection versus drift38312Speciation and macroevolution441AppA catalogue and critique of species concepts447