January 29, 2018 — A geologist might not be the first person that comes to mind when you think about salmon experts, but David Montgomery wrote the book on the decline of salmon: “King of Fish” in 2004.
Montgomery, a geomorphologist and professor at the University of Washington, has a unique perspective on why salmon are so important to our region. Of course, there’s the importance to the indigenous people in our area and the delicious food they provide, but they also have a serious impact on our whole ecosystem.
“Juvenile salmon are hatched in their natal home river streams and they’re tiny suckers, so they go out to the ocean and they get big,” Montgomery explains. “They spend most of their life out at sea in a more resource-rich marine environment then they bring their bodies back to the rivers and streams in Washington, and Puget Sound along the way, with these bodies full of nutrients.”
After the salmon return home, spawn and die, those nutrients don’t just go away. “They get recycled,” Montgomery says. Decaying salmon feed tiny organisms in streambeds, which are eaten the next year by juvenile salmon. Salmon also get dragged onto the forest floor by bears and eagles and distribute their nutrients there. “Fully one-third of the nitrogen in those big old-growth trees in our forests swam up river as a fish,” Montgomery says. “When you lose those big runs of salmon, you lose those nutrients and it cascades through the whole system.”
It’s no secret that those big runs are declining in a major way. Historically, adult salmon returns to the Columbia Basin were at least 10 to 16 million fish annually — today, across the Northwest, less than 5 percent of historic populations of wild salmon and steelhead return to our rivers and streams. Fifteen different salmon and steelhead stocks in Washington state are listed under the federal Endangered Species Act today.
As Montgomery notes, the loss of these salmon means a domino effect to the ecosystem. More than 135 other fish and wildlife populations benefit from the presence of wild salmon and steelhead, from southern resident orca whales, which are at a 30-year population low, to eagles, wolves, bear, otter, coyote, seals and sea lions.
Read the full story at the Seattle Times