Table 1. Model selection results for 2011.

Variable	Relative variable weight	Estimate from top model (lower/upper CI)	Estimate from model average (lower/upper CI)
A. mellifera	1.0	29.56 (15.84/43.28)*	27.79 (14.21/41.38)*
P. pruinosa	0.64	2.78 (−0.11/5.67)	2.72 (−0.08/5.51)
B. impatiens	0.15	–	−4.82 (−49.17/39.52)
Field size	0.14	–	0.0003 (−0.11/0.11)
Treatment	0.03	–	A. mellifera supplemented: −0.28 (−2.59/2.04)
			B. impatiens supplemented: 1.28 (−1.12/3.77)

Relative variable importance weights and parameter estimates with 95% confidence intervals for all variables from models predicting pumpkin yield in 2011. Significant factors are denoted with * (P<0.05). Variables included: bee visitation frequency to pumpkin flowers (Apis mellifera, Peponapis pruinosa, and Bombus impatiens), field size, and supplementation treatment (B. impatiens supplemented, A. mellifera supplemented and nonsupplemented).