Even within our experiments, which used bees of a single species from a single supplier, we found highly significant effects of mass and colony, indicating strong effects of both size and genetic variation on parasitism that are consistent with previous findings ( Otterstatter & Thompson, 2006 ).
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Variable effects of nicotine, anabasine, and their interactions on parasitized bumble bees.
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The sentences
Wald tests ( Lesnoff & Lancelot, 2012 ) were used to test the marginal significance of individual predictor variables (see Supplementary material script 1 ).