Table 2.

F-statistics and estimates of simple regressions on the effects of altitude (m.a.s.l.) on the proportions of social species, non-parasitic species, ground-nesting species, multivoltine species, oligolectic species and on the mean inter-tegular distance (ITD), altitudinal range and geographical distribution of wild bee communities in 34 sites. (The calculations were performed for species-based proportions/means of traits and abundance-weighted proportions/means of traits. Degrees of freedom = 1,32 in all cases.)

Fpestimates
response species weighted
 proportion of social species40.71<0.001y = 37.55 + 0.03 × altitude
 proportion of non-parasitic species0.800.377n.s.
 proportion of ground-nesting species6.060.019y = 62.56 + 9.84e−3 × altitude
 proportion of multivoltine species2.080.159n.s.
 proportion of oligolectic species2.050.162n.s.
 mean ITD (mm)46.07<0.001y = 2.36 + 9.26e−4 × altitude
 mean altitudinal range (m)17.07<0.001y = 696.65 + 0.26 × altitude
 mean geographical distribution8.270.01y = 233.33 − 0.03 × altitude
response abundance-weighted
 proportion of social species21.52<0.001y = 67.64 + 0.02 × altitude
 proportion of non-parasitic species0.270.609n.s.
 proportion of ground-nesting species10.930.002y = 59.62 + 0.01 × altitude
 proportion of multivoltine species2.470.126n.s.
 proportion of oligolectic species0.460.501n.s.
 mean ITD (mm)16.74<0.001y = 2.90 + 9.03e − 4 × altitude
 mean altitudinal range (m)1.850.184n.s.
 mean geographical distribution9.130.005y = 319.44 − 0.05 × altitude