Table 1.

Relative abundance of Bombus species in the contiguous United States and Alaska by World Wildlife Fund (WWF) ecoregion status (Olson and Dinerstein 2002, Olson et al. 2001). WWF ecoregion status is grouped into three broad categories: critical or endangered, vulnerable, and relatively stable or intact.

Species	# of Ecoregions	# of Specimens	Ecoregion Status
			Critical or Endangered (%)	Vulnerable (%)	Relatively Stable or Intact (%)
B. affinis	2	22	100	0	0
B. appositus	13	260	19	54	27
B. auricomus	11	502	86	0	14
B. balteatus	5	55	0	36	64
B. bifarius	19	2870	35	35	30
B. bimaculatus	14	1042	91	9	0
B. borealis	7	25	76	20	4
B. californicus	10	104	62	17	21
B. caliginosus	4	75	95	5	0
B. centralis	15	663	20	25	56
B. citrinus	3	11	100	0	0
B. fernaldae	13	91	41	48	11
B. fervidus	19	162	80	7	13
B. flavifrons	25	910	40	19	41
B. fraternus	5	16	75	25	0
B. frigidus	8	98	0	19	81
B. griseocollis	29	2042	89	7	4
B. huntii	13	577	24	11	65
B. impatiens	18	3138	90	9	0
B. insularis	18	288	36	30	34
B. jonellus	7	72	0	0	100
B. melanopygus	18	278	37	39	24
B. mixtus	21	945	50	41	9
B. moderatus	5	39	0	0	100
B. morrisoni	6	25	32	0	68
B. nevadensis	11	108	45	26	29
B. occidentalis	17	415	6	9	86
B. pensylvanicus	16	530	98	1	2
B. perplexus	8	69	67	16	17
B. rufocinctus	17	395	64	11	25
B. sandersoni	1	1	0	100	0
B. sitkensis	12	203	38	38	24
B. suckleyi	3	19	26	68	5
B. sylvicola	13	199	8	31	61
B. ternarius	6	291	92	1	6
B. terricola	5	31	0	52	48
B. vagans	14	346	66	32	3
B. vandykei	6	44	78	9	13
B. vosnesenskii	8	959	87	13	0