Dead mussels at the waterline in British Columbia. Photograph: Christopher Harley

by Leyland Cecco • July 8, 2021

More than 1 billion marine animals along Canada’s Pacific coast are likely to have died from last week’s record heatwave, experts warn, highlighting the vulnerability of ecosystems unaccustomed to extreme temperatures.

The “heat dome” that settled over western Canada and the north-western US for five days pushed temperatures in communities along the coast to 40C (104F) – shattering longstanding records and offering little respite for days.

The intense and unrelenting heat is believed to have killed as many as 500 people in the province of British Columbia and contributed to the hundreds of wildfires currently burning across the province.

But experts fear it also had a devastating impact on marine life.

Christopher Harley, a marine biologist at the University of British Columbia, has calculated that more than a billion marine animals may have been killed by the unusual heat.

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