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Intransitivity (measured as metric I) observed in grasslands (n = 175 clusters of environmentally similar grasslands out of a set of 1500 sites) and drylands (n = 151, sites). Box plots show the median, 25% and 75% quartiles. The intransitivity metric was not significantly different between the two datasets (Mann-Whitney´s U = 12030; P = 0.16).
