A recent Canadian study, undertaken by York University and the University of Saskatchewan, studied climate resilience among northern fish species with some surprising results. Northern fish are, by nature, remarkably resilient, adjusting to a range of conditions including short summers with 24-hours of daylight and abundant food followed by long dark winters with little or no food availability. But as streams warm, prompting an increase in the invertebrates on which salmon feed, salmon species are tending to grow faster and have greater reproductive success. That’s the surprise, and could be a boon to indigenous communities, especially as salmon expand their ranges further north. But for some fish, mainly dolly Varden and Arctic grayling, which are specialized to thrive in cold Arctic waters, there may be no adaption or migration option at hand as rivers warm and summers grow longer.
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