Scientists are unsure if warming temperatures are causing the bizarre invertebrates to spread.
It’s likely a lot of Cowichan Lake residents think there’s plenty of water around for the summer of 2017, given the winter we’ve been having. But, according to Cowichan River watcher Parker Jefferson, “We’re just about where we were last year.”
“The exact reasons why the return fell at the lower end of the forecast range are unknown at this time, but poorer than average marine survival is a leading candidate.”
Voracious predator could be big threat to native aquatic populations
Since the initial June to July heatwave shocked the Pacific Northwest, Heim says the Tsolum River Restoration Society has observed significantly fewer fish in the river, especially in its lower portions. Many of the remaining coho, which survived the heat wave, are suffering from diseases and fin rot as a result of heat stress.
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