Extreme heat cooks mussels in their shells on Canada coast – video

More than 1bn marine animals along Canada’s Pacific coast are likely to have died in this year’s heatwave, highlighting the vulnerability of ecosystems unaccustomed to extreme temperatures. Christopher Harley, a marine biologist at the University of British Columbia, walks along the shore of Porteau Cove Provincial Park in British Columbia. The crunch heard in the video is the shells of dead mussels underfoot that perished during low tide as temperatures spiked across the region

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