Fig. 3
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Adjusted mean and standard error of the selectivity index (D; according to Jacobs, 1974) for aquatic prey in allopatric and sympatric populations of brown trout and brook trout. Positive D values indicate preference and negative values avoidance. Brackets with asterisks indicate significant differences between allopatric and sympatric populations (⁎P < 0.05; ⁎⁎P < 0.01).
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