Environmental filtering of body size and darker coloration in pollinator communities indicate thermal restrictions on bees, but not flies, at high elevations.

Bombus occidentalis ( p = 0.059) showed a marginally non-significant increase while Dialictus 003 ( p = 0.003), Heriades 002 ( p < 0.001), Agapostemon texanus ( p = 0.029), and Lithurgus apicalis ( p = 0.015) all showed significant increases in body darkness as elevation increased.

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