Table 2. Z scores and p-values of relatedness and tongue length for various scales and measures of similarity.

		Local		Regional		Continental
	Metric	Z	p	Z	p	Z	p
Relatedness	MNND	1.737	0.082	2.477	0.013	4.387	0.001
	MPD	2.159	0.031	1.433	0.152	3.490	0.001
Trait	MNTD	3.887	0.000	0.051	0.959	1.254	0.119
	MTD	4.933	0.000	−1.134	0.257	0.215	0.416
	range	3.754	0.000	0.386	0.699	1.267	0.122
	SDNNr	0.952	0.341	2.590	0.009	0.748	0.227

Local assemblages (n = 110) represent co-occurring species and the species pool is the regional gridcell the assemblage is within. Regional assemblages (n = 45) are the species in each grid cell compared to a species pool of all Nearctic Species. The continental assemblage (n = 1) consists of all Nearctic species compared to all Bombus globally.