Table 2. Numbers of individual bumble bees recorded visiting Vaccinium uliginosum flowers at different study sites during 298 h of observation.

	Species:	Large sized			Small sized
		B. terrestris OTU	B. lapidarius	B. vestalis OTU	B. pratorum	B. pascuorum	B. hortorum OTU	B. hypnorum	B. campestris	B. soroensis
	Size; wingspan:	20; 40	22; 38	21; 37	16; 30	17; 32	19; 35	18; 35	17; *	16; 30
Study site	Year
Grande	2008				3	1
Fange	2009	4			15	33	1
	2010 May	8	1	2	2	25	1
	2010 June	4	3	9	9	39				2
Wé des	2008			2	17			2
Pourceaux	2009	3	1	4	28	4		4
	2010 June	11	3	5	15	11
Chamfa	2010 May	2	2	1	4	3
	2010 June	4	2	14	9	9		3
Robiefa	2010 May	12	7		10	8
	2010 June	4	1	8	5	5	1	4
Pisserotte	2010 May	7	4	1	19	3		2
	2010 June	17		24	18	13
Nazieufa	2010 May	19	11		12	4
	2010 June	5			10	3
Massotais	2010 May	18	2	1	5	20
	2010 June	10				1	3
Fange aux	2008	16	2		28	2		3
Mochettes	2009	3	1	2	42	9	38	7
	2010 May	19		2	34	13	4	2
	2010 June	8		7	87	5	4	10
Sacrawé	2008	19	27		15	10	7	3
	2009	87	73		56	9	4	9	1
	2010 May	19	8	1	3	1	2	4
	2010 June	62	23	5	24	11	4	5	1
Total		361	171	88	470	242	69	58	2	2

Populations descend from small to large. Species are grouped into size classes after Benton [32]. *wingspan unknown.