What determines the survival and population health of the Bombus vestalis?

Answer

The abundance and health of the Bombus terrestris population

This parasitic species is entirely reliant on its host to reproduce. If the host population declines due to factors such as habitat loss, pesticides, or disease, the parasite's means of reproduction vanishes. Therefore, the conservation of this species is intrinsically tied to the continued success and prevalence of the White-tailed Bumblebee.

What determines the survival and population health of the Bombus vestalis?
speciesinsectbeebumblebeepollinator