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Density plots illustrating spawning tributary arrival date of fish with different maturation genotypes across spawning tributaries in 6 sub-basins: a) Klickitat, b) Yakima, c) Tucannon, d) Asotin, e) Grande Ronde, and, f) Clearwater. Asterisks in each panel correspond to the significance level between premature and mature genotypes (Tukey’s test): * = p < 0.05; ** = p < 0.01, *** = p < 0.001
