mechanisms working from mate recognition through postzygotic stages. Asymmetric effects
of isolating barriers can result in asymmetrical gene introgression during interspecific
hybridization. The flightless ground beetles Carabus yamato and C. albrechti are distributed
parapatrically in Japan, showing repeated asymmetrical introgression of mitochondria from
C. albrechti to C. yamato. This pattern suggests that reproductive isolation between these …