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Fruit setting rate during open pollination (V1) and isolation from insect visitors (V2) in two populations (a, low elevation and b, high elevation): mean relative interaction index (RII) of visitor effects on two pollinations of Thylacospermum caespitosum (c, low elevation and d, high elevation). Error bars indicate the standard error of the means (n = 3). *represents differences among two populations, * p < 0.05, ** p < 0.01
