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Fig. 11 | Environmental Evidence

Fig. 11

From: How do changes in flow magnitude due to hydropower operations affect fish abundance and biomass in temperate regions? A systematic review

Fig. 11

Comparison of overall average effect size for within-year BA studies one (k = 19), two (k = 5), three (k = 4) and four (k = 3) years post-intervention and when After years 1–4 were aggregated (year 1–4). Error bars indicate 95% confidence intervals. Models were developed for each of the first four years after a change in flow magnitude [i.e., comparing the most recent or only Before year with After year-1 only, After year-2 only, After year-3 only, and After year-4 only, as well as the average of years 1–4 after a change in flow magnitude. 95% confidence intervals that do not overlap with the dashed line indicate a significant effect (at the p < 0.05 level). k: number of effect sizes

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