Global meta-analyses—Before/After studies Within-year Before/After studies —Abundance The overall mean weighted effect size of within-year BA studies, considering only effect sizes for abundance in post-intervention year-1 was 0.25 (95% CI − 0.04, 0.56; k = 19, p = 0.091), suggesting changes in flow magnitude had a moderately significant overall positive effect on fish abundance (Table 4 C, Fig. 11 ; Additional file 12 : Fig.
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How do changes in flow magnitude due to hydropower operations affect fish abundance and biomass in temperate regions? A systematic review.
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