interesting news…big possible impacts for dam removal projects.
…Researchers had concluded that the Klamath’s spring-run Chinook are genetically similar to fall-run Chinook.
New research findings, however, are forcing scientists and federal officials to revisit that decision. In 2017, researchers announced that they’d identified a single gene that appears to control whether Chinook salmon, as well as steelhead, a closely related species of rainbow trout, migrate upriver before or after reaching sexual maturity. They concluded that the genetic change that produced spring-run Chinook occurred only once in the species’s history.