Data from: Differences in offspring size predict the direction of isolation asymmetry between populations of a placental fish

Matthew Schrader, Rebecca C. Fuller & Joseph Travis
Crosses between populations or species often display an asymmetry in the fitness of reciprocal F1 hybrids. This pattern, referred to as isolation asymmetry or Darwin’s Corollary to Haldane’s rule, has been observed in taxa from plants to vertebrates, yet we still know little about which factors determine its magnitude and direction. Here we show that differences in offspring size predict the direction of isolation asymmetry observed in crosses between populations of a placental fish, Heterandria...
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