CBC News —
Climate change, a supply of seals to eat and effective conservation in the United States are all possible explanations for the apparent increase in great white sharks in Atlantic Canada, according to a newly published paper in the Canadian Journal of Fisheries and Aquatic Sciences.
The peer-reviewed report, led by authors from the University of Windsor in Ontario, speculates on why more of the apex (top-of-the-food-chain) predators are being seen in the summer months, especially off Nova Scotia.
One hypothesis is that the great white shark’s range has shifted, bringing them into an area where they were rarely seen in the past.
“A northward range expansion could be related to multiple factors, including warming Canadian waters due to climate change, population recovery and/or increased regional prey abundance,” the authors state.