Red tide has contributed to or is suspected in the deaths of nearly 190 manatees so far this year.
Sea ice has shrunk, but scientists are seeing signs that Alaska's bowhead whales are flourishing.
The herds are increasingly moving around in Bristol Bay, perhaps seeking new feeding grounds, a biologist said.
Village wildlife observers worry that the unusual warmth of oceans off Alaska is causing problems throughout the ecosystem.
Pacific walruses are beaching on Northwest Alaska shores, peppered with bleeding skin legions that have been observed on dying ringed seals in Arctic Alaska, according to federal biologists.
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