Table 1.

Comparison of duration (days) up to different phases between B. friseanus and B. breviceps colonies initiated by field-collected queens reared in the laboratory.

Bumblebee Species	Number of Colonies	Initial Oviposition	First Worker Emergence	Colony Size of 30 Workers	Colony Size of 60 Workers	Colony Size of 80 Workers	First Male Emergence	First Gyne Emergence	Colony Lifetime
Bombus friseanus	13	8.9 ± 7.7 a	25.4 ± 1.8 a	38.8 ± 5.0 a	46.2 ± 5.2 a	53.6 ± 5.5 a	60.6 ± 5.1 a	73.5 ± 5.9 a	132.5 ± 15.5 a
Bombus breviceps	20	13.6 ± 7.0 a	26.5 ± 8.1 a	62.1 ± 13.2 b	76.2 ± 15.0 b	87.8 ± 17.8 b	120.4 ± 12.7 b	141.2 ± 16.0 b	217.8 ± 21.7 b

Same letters in the same column indicate no difference at p > 0.05 level and different letters indicate significant difference at p < 0.01 according to the Mann–Whitney U test.