Here's a study that has very little to do with the USA but a lot to do with wolves. It's shamelessly copy and pasted from a local forum.
Do Woodland Caribou need old growth and lichen to thrive, even survive?
Will wolves exterminate Caribou if given the chance, in opposition to this so called "Balance in Nature" concept?
An isolated Island in Ontario offered researchers an opportunity to learn.
See how fast things happen....
1982 - Eight caribou are translocated from Slate Island to Michipicoten Island, a 71 square mile Provincial Park. No wolves present, No hunting allowed.
2011 - Caribou herd is estimated at 680.
- Noteworthy is the Island is not considered prime caribou habitat, no lichen.
Caribou thrived without this food source, considered Critical by some.
2012- Four wolves found on Island, believed to have crossed to the Island by ice during an unusual cold spell.
2017 - Wolf pack has grown to 18.
2017 - Caribou herd has been reduced to 30!
A 95% reduction in just Four years....
With the experiment at and end due to an inevitable extirpation of the remaining 'Bou, government officials are preparing to translocate the remaining caribou off Michipicoten and back to Slate.... social licence has removed the option to kill the wolves...
Lessons learned.
Woodland Caribou DO NOT need old growth as a food source for survival.
One pack of wolves wiped out a herd of 700 caribou in just Four years!
The government will choose to translocate endangered Caribou rather than kill a few wolves.
Michipicoten Island - Wikipedia