Marin’s salmon populations have shown surprising resilience in the face of a devastating new threat to California’s native chinook and coho. Research published this summer by the University of California, Davis, Coastal and Marine Science Institute and the National Oceanic and Atmospheric Administration identified high levels of deficiency in a chemical called thiamine in salmon populations across Northern California. Thiamine is crucial for neuron, heart and immune system function, and its absence weakens adult health…