Canadian lakes are in hot water over climate change, a new research survey has concluded.
“Canadian lakes are warming twice as fast as the rest of the lakes globally,” said York University biologist Sapna Sharma, a co-author of a paper published in the journal Bioscience.
Warming air temperatures have reduced ice cover an average of 31 days over the past 165 years, with ice cover disappearing six times faster in the past 25 years. About 15,000 Northern Hemisphere lakes that once froze every winter are now experiencing ice-free years and 6,000 of those lakes may never freeze again.
Lake Superior, the world’s largest lake by surface area, now experiences algae blooms. In 2014, a secluded lake in Ontario’s Algonquin Park was closed to camping because of algal blooms — the first such bloom in more than a century.Article contentRising temperatures are also making it tough for cold-water fish species, such as walleye or lake trout, the study found. Those fish are already beginning to be crowded out by those that prefer warmer climes, such as bass.
As well, earlier ice melting can throw off the delicate timing of when food becomes available to the newly hatched fish that need it. That reduces the number of young fish can produce.
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