Bombus monticola -Bilberry bumblebee (Stiperstones NNR)

Another highlight of the year !!

Distribution
Historically, widely distributed throughout northern and western Britain and recently recorded from Ireland. There are very few records from south-eastern England, but it did formerly occur on the higher areas of the Weald near Hindhead in Surrey (specimen in Haslemere Museum collection). There is a marked decline in the distribution of this bumblebee throughout its former range in Britain. The species is boreo-alpine in western Europe only: northern and western Fennoscandia, the Pyrenees, northern Italy, the Alps and Balkan mountains. The closely related B. lapponicus has a more easterly distribution (Svensson 1979).
Status (in Britain only)
This bee was not regarded as being scarce or threatened, but has now been included on English Nature’s Species Recovery Programme because of the modern evidence of serious decline.
Habitat
Associated with mountain and moorland habitat, although scarce in pure moorland areas. Recent research has shown a frequent connection with grassland habitats as well as moorland ones.
Flight period
The species is eusocial, with queens emerging from hibernation in April; workers are present from May onwards, and males and new females from July to early October.
Nesting biology
Nests are underground and are started in old mammal nests. Nest sizes are fairly small, and the colonies often have fewer than 50 workers. The life-cycle is also short, about 3-4 months.
Flowers visited
There are clear flower-visiting preferences for this species, with bilberries (Vaccinium spp.) and sallow (Salix spp.) being much used in spring; bird’s-foot trefoil (Lotus corniculatus), clovers (Trifolium spp.) and raspberry (Rubus idaeus) and bramble (Rubus fruticosus agg.) in early to mid summer and bell heather (Erica cinerea) and bilberries in mid to late summer.
Parasites
It is likely that this species is attacked by the socially parasitic bee, Bombus sylvestris

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