Table 1.

Means (±standard error) of the variables measured per Bombus terrestris colony. N = eight colonies per treatment (24 colonies in total).

		control	2.4ppb	10ppb
Colony weights
Colony weight (start, g)		549.1 ± 6.7	549.3 ± 6.6	550.5 ± 5.8
No. workers (start)		94 ± 4.3	95 ± 7.6	108 ± 6.0
Weight change (g) over experiment		336.56 ± 11.1	348.99 ± 17.9	322.46 ± 9.3
Total number bees produced over experiment
No. workers		375 ± 43.45	400 ± 25.41	393 ± 51.73
No. males		275 ± 20.83	231 ± 29.04	279 ± 28.91
No. queens		1.75 ± 0.53	8.4 ± 4.21	2.25 ± 1.11
Dry weight of individuals produced
Average worker weight (g)		0.052 ± 0.003	0.057 ± 0.004	0.052 ± 0.002
Average male weight (g)		0.083 ± 0.003	0.104 ± 0.008	0.086 ± 0.003
Average queen weight (g)		0.25 ± 0.020	0.25 ± 0.013	0.24 ± 0.015
Total biomass produced
Total worker biomass (g)		19.43 ± 2.32	22.19 ± 0.87	19.54 ± 1.97
Total male biomass (g)		22.99 ± 2.12	23.53 ± 3.14	23.95 ± 2.63
Total queen biomass (g)		0.37 ± 0.06	1.90 ± 0.98	0.46 ± 0.18