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Effect of altitude on (a) the phylogenetic relatedness of wild bee species within sites (NRI): F1,32 = 10.63, p = 0.003, y = −0.030 + 2.62e − 3 × altitude; and (b) the mean phylogenetic distances of wild bees between sites (MPD): F2,31 = 93.04, p < 0.001. The altitudinal categories are: low (<1000 m.a.s.l.), medium (1000–1499 m.a.s.l.), high (>1500 m.a.s.l.).
