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Egg-hatching rate (%) in three types of matings in ÅL and PT populations. The mating types are crosses between five regional populations, including ÅL and PT (Materials and Methods; nPT = 11, nÅL = 14 egg clutches), crosses between different families from the same regional population (nPT = 57, nÅL = 85 egg clutches), and sib mating (nPT = 60, nÅL = 58 egg clutches). The lines above the graphs indicate significant differences between pairs of treatments: **P < 0.01; ***P < 0.001.
