Table 3. Model selection results for 2012.

Variable	Relative variable weight	Estimate from top model (lower/upper CI)	Estimate from model average (lower/upper CI)
A. mellifera	0.17	–	−5.93 (−26.83/14.98)
P. pruinosa	0.12	–	−0.03 (−10.52/10.46)
B. impatiens	1.0	43.70 (21.34/66.06)*	45.08 (21.22/68.94)*
Field size	0.15	–	0.086 (−0.21/0.39)
Treatment	0.07	–	A. mellifera supplemented: 1.23 (−3.28/5.75)
			B. impatiens supplemented: −2.78 (−7.90/2.34)

Relative variable importance weights and parameter estimates with 95% confidence intervals for all variables from models predicting pumpkin yield in 2012. Significant factors are denoted with an asterisk (*) (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).