Table 4 Summary effect sizes based on the selected dataset (mean differences to before manipulation)

Secchi depth during manipulation (m)

0.22

0.11 – 0.33

Secchi depth 1–3 years after manipulation (m)

0.47

0.23 – 0.70

Chlorophyll a during manipulation (μg/l)

−30

−42 – −17

Chlorophyll a 1–3 years after manipulation (μg/l)

−33

−52 – −14