Do caribou population numbers correlate well with atmospheric CO2 concentrations?

Mighty caribou herds [allegedly] dwindle - The Sarnia Observer - Ontario, CA

ENVIRONMENT: Biologists blame global warming
Posted By THE ASSOCIATED PRESS

Even with trace amounts of carbon dioxide in the air, five million caribou still survive

The world population is about 5 million.

As CO2 rose, the George River caribou herd was so devastated that its size only grow by a factor of 46

In one of the great natural marvels of hoofed mammal demography, the George River caribou herd increased from 15,000 animals in 1958 to 700,000 in 1988 - the largest herd in the world at the time.

Reindeer and Caribou Populations, Alaska Science Forum

Instead of the 7- or 8-year cycle of the hare, the caribou is most likely to be in the range 50 to 100 years. The cycle might consist of population booms and crashes or it might be less drastic.