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Additional file 1: Table S1. Coordinates of collecting sites of Argiope bruennichi in the core region of Southern France and the range edge region of the Baltic States. Figure S1. Temperature regimes of collecting sites (see Table S1) and climate chambers in which winter simulations took place. Table S2. Average day and night temperatures in the climate cabinets simulating temperature conditions of the populations from Southern France and Baltic States over the course of the reciprocal common garden experiment. Table S3. Sample sizes for the reciprocal common garden experiment. Table S4. Descriptive statistics for environmental conditions in the test room during the ballooning trials. Figure S2. Comparison (boxplot) of probabilities to balloon (%) for (A) the offspring of the females collected and (B) populations of Argiope bruennichi from Baltic States and Southern France. Figure S3. Relationship between the probability of a spiderling to balloon and the temperature in the test room. Estimated logit model is shown.