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Effect of altitude on (a) the mean altitudinal range (m) and (b) the mean geographical distribution (number of quadrants (10 × 10 km) at which species were found in Bavaria) of wild bee communities. Black circles and lines represent abundance-weighted proportions/means of traits, whereas grey solid points and lines represent species-based proportions/means of traits. Lines are presented if simple regressions were significant (p < 0.05).
