Climate change is knocking some Pacific salmon out of alignment with the growth of the ocean plankton they eat to survive, new research says.
In the largest data set ever gathered on the timing of juvenile salmon migration, research found the changing climate is causing some salmon populations to migrate earlier out of step with plankton blooms that are also affected by changing weather patterns.
Numerous species of Pacific salmon are at risk or even endangered for several reasons, including overharvesting and lack of habitat protections. Wilson suggests the response by the young salmon may be a coping mechanism that helps them survive and reinforces the need to protect biodiversity. On average, fish are still managing to find the plankton they need, Wilson said, but climate change means they'll be matching up with the blooms less and less.
“So, they might say, Chilko sockeye are not changing their migration timing so we don't have to worry about it. Let's move on to the next topic,” she said.The study's authors recommend avoiding a “one-size-fits-all approach” to management, she said.
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