mastertangler wrote on Aug 13^th, 2010 at 8:36pm:

I wonder about that and here's why. (This is only my own surmising BTW and I could be mistaken). Moose often take their calves to islands to help deter predation from their #1 mortal enemy, wolves. I believe that adult male bears frequent the islands in search of these calves.

Might be true in early spring, but once the calves are old enough to walk with mom to forage I think the island incentive would disappear for bears.  

Most...not all, but most...places I've seen evidence of problem bears are on mainland or where careless campers often congregate.