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Minimum seasonal water potential (Ψmin; a) and cavitation resistance (P50; b) for island–mainland species pairs. These traits serve as proxies for exposure versus sensitivity to drought and are the components used to estimate hydraulic safety margins and provide a quantitative test of the conceptual model linking physiological trait patterns to detection of climate refugia (Fig. 1). P-values for paired statistical comparisons are depicted in the upper left corner of each plot.
