Which bumblebee species serves as a common host for the Bombus vestalis?
Answer
Bombus hortorum
The Bombus hortorum, often referred to as the long-tongued bumblebee, is a primary host target for the Bombus vestalis. Parasitic bumblebees like the Bombus vestalis require established, functional colonies to successfully infiltrate and take over. While other species like Bombus pascuorum or Bombus sylvarum can also be targeted, the Bombus hortorum is one of the key species for which the parasite's evolutionary adaptations are specifically tuned to ensure successful usurpation.
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