I do not have anything other than a cell phone right now... but there is a ridiculous contingent of biologists ready to stop, drop, and roll out a raft of preconceived notions.
Caribou are extremely complex and have historically been mismanaged everywhere... I will add some references to papers when I can get at it.
Look at AK caribou studies for a start.
Nutritious lichen??? Surely you jest! Could that be why caribou stomachs are only slightly bigger than a VW?