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    Variation in digestive performance between geographically disjunct populations of Atlantic salmon: countergradient in passage time and digestion rate

    European Atlantic salmon (Salmo salar) populations inhabit rivers from northern Portugal to northern Norway across a wide spectrum of environmental variability. To address whether single physical factors might le...

    Alfredo G. Nicieza, Luiz Reiriz, Florentino Braña in Oecologia (1994)