Table 1 Susceptibility to bias of the evidence on included biomanipulations
No. of cases | |
|---|---|
Low | 53 |
Medium due to confounding interventions or disturbances | 31 |
Medium due to insufficient data on potential effect modifiers | 13 |
Medium due to absence of useful data on within-year water-quality variation | 43 |
Medium since the lake consisted of multiple basins with different interventions or water quality | 6 |