Table 1.

Summary statistics for offspring provisions and adult body measurements

	Females	Males	Sex differences	Social differences
Pollen masses
Provision dry weight (mg)
Solitary nests	64.37 ± 20.73	47.61 ± 9.21	Z = 5.10	Z = −5.56
Social nests	94.50 ± 18.68	67.01 ± 17.04	p < 0.0001	p < 0.0001
Provision volume (ml)
Solitary nests	0.14 ± 0.04	0.10 ± 0.03	Z = 4.75	Z = −5.15
Social nests	0.22 ± 0.05	0.15 ± 0.05	p < 0.0001	p < 0.0001
Sugar content (mg)
Solitary nests	11.16 ± 5.47	8.22 ± 4.53	Z = 3.02	Z = −2.47
Social nests	14.48 ± 6.52	10.19 ± 5.54	p = 0.003	p = 0.01
Protein content (mg)
Solitary nests	22.84 ± 6.89	17.85 ± 4.11	Z = 4.58	Z = −5.70
Social nests	35.95 ± 7.89	25.74 ± 7.16	p < 0.0001	p < 0.0001
Adult bees
Adult dry weight (mg)	38.28 ± 8.91	22.62 ± 6.56	Z = −9.44	–
			p < 0.0001
Adult head width (mm)	4.28 ± 0.39	3.46 ± 0.23	Z = −8.93	–
			p < 0.0001

Provision measurements are based on 44 females (23 from solitary nests and 21 from social nests) and 52 males (35 from solitary nests and 17 from social nests). Adult body size measurements are based on 61 females and 63 males. Adult dry weight measurements are based on 81 females and 83 males. The additional 20 individuals were collected in 2001 at light traps on BCI. Differences between sexes and sociality were determined with a Mann–Whitney U test