Bees have been evolving throughout Canada and elsewhere for thousands and thousands of years, so they are well adapted to deal with the climate and the stressors that occur naturally and to successfully overwinter.
The wild bees are, perhaps, a little more vulnerable in some ways in the sense that most of those wild bee species are solitary. The social nature of honeybees is not unique, but the vast majority of bees are not social.
In that sense, you have a huge honeybee colony, and there's strength in numbers so to speak, so that colony can kind of buffer itself against the stresses it may encounter, whereas with some solitary species and wild species.... For instance, you may have a bumblebee queen that's flying around at this time of the year, and she is the actual individual that's trying to found and establish the colony in the wild, so she's a lot more vulnerable to potential stresses, whether they occur over the winter or during the season.
I guess that would be one of the main differences. I don't know if Dr. Kevan has something to add to that.