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Non-stationarity in proposed mechanisms controlling salmon productivity: hypothesis testing results (p-values) from mixed-effects Ricker models fit to data from before (a) and after (b) 1988/1989. Dashed horizontal lines indicate value of α (0.014) required to maintain the expected experiment-wide type I error rate at 0.05; values at or below this line are considered evidence for rejecting the null hypothesis of no effect.
