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Fig. 9 | Environmental Evidence

Fig. 9

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

Fig. 9

Number of cases by study design and comparator. Study design codes: BA: Before/After; CI: Control/Impact; BACI: Before/After/Control/Impact; DEF_BA: deficient Before/After, INCOM-BACI: incomplete Before/After/Control/Impact; RCA: Reference Conditional Approach; ALT-CI: alternative Control/Impact. Temporal comparator codes: Existing_Hydro_alt flow: existing HPP where one flow magnitude Before is compared to a new level After intervention; Existing_Hydro_base flow: existing HPP where one base flow magnitude Before is compared to a new base flow level After intervention; New_Hydro: flow prior to the installation of a new HPP. Spatial comparator: No_Hydro: a different nearby waterbody with no HPP; Upstream: upstream conditions in unmodified sections of the study waterbody; Up + Downstream: both up and downstream unmodified sections of the study waterbody; ALT_Hydro: a different nearby waterbody with HPP operating at a different but unmodified flow magnitude. Three studies reported more than one study design; therefore, the number of cases exceeds the number of studies

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Environmental Evidence

ISSN: 2047-2382