Hatching time and time to reach Gosner’s stage 25 of Rana latastei in relation to a–d the invasion status of populations b–e treatment during the rearing experiment and c–f egg volume as parameter of parental investment. Red plots represent crayfish presence in the original ponds a–d or in the treatment b, e and blue plots represent crayfish-free sites a–d or the rearing experiment controls (b, e). Line shows mean correlation and coloured shaded area shows the 95% confidence interval. N = 42 clutch fragments, N = 239 larvae.