Search our collection of background (non-event) articles from news media, science journals and other sources.
Beavers are transforming Alaska's Arctic tundra, creating both challenges for local communities and ecological opportunities, as their population and dam-building activities alter landscapes and affect permafrost.
A minimum of 42,500 chinook are supposed to get to their Canadian spawning waters to meet conservation goals. Only 15,300 of those fish made it to Eagle, near the Yukon border.
Researchers say climate change is playing a big role in the collapse, which has left thousands of people along the river without the salmon they depend on.
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