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Figure S1 Salamander mass excluding paedomorphic individuals. Mean values are denoted by black squares, median values by bold lines, and outliers by open circles. Boxplot whiskers denote the maximum and minimum quartiles. (a) Data grouped by hydroperiod treatment for comparison among genotypes. (b) Data grouped by genetic class for comparison among treatments. See Supporting Information Table S7 for significance tests of pairwise comparisons of mean values.

Figure S2 Body condition of surviving salamanders calculated as the final mass divided by SVL. Mean values are denoted by black squares, median values by bold lines, and outliers by open circles. Boxplot whiskers denote the maximum and minimum quartiles. (a) Means arranged by hydroperiod treatment for comparison among genotype categories. These data include both metamorphosed and paedomorphic individuals. (b) Means arranged by genotype category for comparison among hydroperiod treatments. See Supporting Information Table S8 for significance tests of pairwise comparisons of mean values.

Table S1 Hybrid salamander collection site information. Pond-level Hybrid Index Score (HIS) is calculated as the proportion of non-indigenous alleles present in the population.

Table S2 P-values for Fisher's exact tests for survival (below diagonal) and drying-related mortality (above diagonal). Asterisks denote significance at α = 0.05 after sequential Bonferroni correction. See Supporting Information Table S3 for odds ratios and confidence intervals.

Table S3 Odds ratios and 95% confidence intervals (in parentheses) for Fisher's exact tests for salamander survival (below diagonal) and drying-related mortality (above diagonal). See Supporting Information Table S2 for P-values.

Table S4 P-values for pairwise t-tests for mass (above diagonal) and time to metamorphosis (below diagonal). Asterisks denote significance at α = 0.05 after sequential Bonferroni correction. See Supporting Information Table S5 for effect sizes of comparisons.

Table S5 Effect sizes (Cohen's d) for pairwise t-tests for salamander mass (below diagonal) and time to metamorphosis (above the diagonal). Daggers indicate effect sizes exceeding 0.3. See Supporting Information Table S4 for P-values.

Table S6 Summary data for paedomorphic individuals.

Table S7 P-values (above diagonal) and effect sizes (below diagonal) of pairwise t-tests for salamander mass excluding paedomorphs. Only comparisons involving the ‘none’ (nondrying) treatment are shown. Asterisks denote significance at α = 0.05 after sequential Bonferroni correction; daggers denote effect sizes greater than 0.3.

Table S8 P-values (above diagonal) and effect sizes (below diagonal) of pairwise t-tests for salamander condition at metamorphosis excluding paedomorphs. Asterisks denote significance at α = 0.05 after sequential Bonferroni correction; daggers indicate effect sizes greater than 0.3.

Table S9 Linear mixed-effect regression model comparison for salamander condition. Asterisks denote the models with the lowest AIC score.

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