We used generalized linear mixed models to assess the fixed effects of acclimation temperature and environmental predictors and their interaction on developmental traits (hatching success, clutch size, development time). We included clutch as a random effect. For clutch size, we used a Conway–Maxwell Poisson error distribution because of initial overdispersion in the data (Chanialidis et al., 2018). For hatching success of snails, we used a binomial error distribution with logit link function. For development time, we used a Gaussian distribution. For all development analyses, we used environmental predictors as defined in Table S5. For these analyses we used the glmmTMB package (Brooks et al., 2017). We performed all thermal tolerance and developmental trait statistical analyses in R (v. 3.5.1, R Core Team, 2018).

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