The fish may be a harbinger of dramatic warming in the north—and rapidly transforming ecosystems.
As the Arctic warms up to four times faster than the rest of the planet, species are migrating to higher latitudes, both because the Arctic is becoming more hospitable to them, and because their native habitat is becoming less so. The region is greening, for instance, as shrubs and tree species get a foothold in the new climate. Native fishing communities along the North Slope of Alaska have reported catching chum salmon here and there over the last few decades, but they are now finding more.
So it's not hurting salmon populations, but it's certainly helping the Dolly Varden and resident fishes.” More warming in the Arctic means more liquid water, especially during the critical winter period when water is usually locked up as ice. Liquid water can come from the degradation of permafrost—frozen soil, basically. Permafrost thaw can also allow for the connection between groundwater springs and the surface river.
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