Climate change, not habitat loss, may be the biggest threat to the survival of threatened caribou herds, new research suggests.
But climate change has also been at work in the forests. Slowly warming temperatures have greatly expanded the range in which whitetail deer can thrive. In order to establish whether that envelope was spread by climate or by habitat, the authors looked to a region of northeastern Alberta and northwestern Saskatchewan.
“We found far fewer deer in places where the climate was snowier and colder,” Dickie said. “We did not find an effect habitat alteration — it was half the magnitude of the climate impact.Although human impacts on caribou range are much heavier in western Alberta — some ranges are more than 90 per cent disturbed — Dickie said she would expect similar results for that region as her paper found in the east.
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