[nemo]

Sorry, been busy, still am busy, really. Besides habitat loss and pesticides, there's the impacts of domesticated animals and other human-originated animals. Those overlap with habitat loss to some degree, but feral cats, rats, dogs, grazing goats, sheep, cattle, starlings (in the US), and other non-native animals like fire ants (in the US), et al have have an impact past lost habitat and lots of species loss is driven by starlings, dogs, cats, and fire ants. Honeybees fit in there as another domesticated animal adding some environmental impact. I don't have a study handy, but those aren't too hard to find. Their impact includes spreading some diseases solitary bees are susceptible as well as reducing the resources for other pollinators.