Water abstraction affects abundance, size-structure and growth of two threatened cyprinid fishes.

Barbel annual size increment was positively correlated to the proportion of days with discharge equal to zero recorded in T9 (Pearson’s r = 0.773; P = 0.024), whereas a marginally significant correlation ( r = 0.602; P = 0.082) was found between chub increment and air temperature measured in St.

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The effect of water intermittency was highly significant for the two species after accounting for the variation with altitude, with ca. 60% of explained variation ( R 2 adj ) for both models ( Table 2 ).

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