Table 2. Total numbers of bumblebees observed in the red clover fields in the past and present.

		No workers		No queens
Functional group	Bombus species	past	present	past	present
Long-tongued	B. hortorum	1424	858	24	23
	B. pascuorum	349	2307	6	19
	B. muscorum	122	236	3	0
	B. distinguendus	857	0	24	0
	B. sylvarum	52	0	2	0
	B. veteranus	121	0	5	0
	B. ruderarius	21	0	0	0
	B. subterraneus	17	0	2	0
Short-tongued	B. terrestris	3906	13580	21	349
	B. lapidarius	445	3499	12	98
	B. hypnorum	17	12	1	0
	B. pratorum	29	24	0	0
	Total	7360	20516	100	489

Bumblebee species were classified as long-tongued or short-tongued on the basis of tongue lengths measured in [24]. In both past and present studies, individuals belonging to B. terrestris (L.) and the B. lucorum complex (B. lucorum L., B. magnus Vogt. and B. cryptarum (F.)) were recorded as one species (hereafter B. terrestris). These species are difficult to distinguish in the field, but functionally similar [53], [54]. Notice that the sampling intensity differed between past and present studies, and the observed numbers of bees are, hence, not directly comparable.