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Predawn water potential (a), stomatal conductance (b) and quantum efficiency of PSII (c) measured during the peak of the summer dry season for 10 island–mainland species pairs. Each point represents one species pair. Dashed line is a 1:1 line. A majority of points above the 1:1 line (i.e. blue region) indicate more favorable water relations for island plants. P-values for paired statistical comparisons are depicted in the lower right corner of each plot.
