Table 3.
Summary of GLMs assessing the relation between univariate metrics and the covariates “Depth,” “Temperature,” “Wave exposure,” (SWM) and “Salinity,” as well as the relationship to ‘Secchi depth” and “Area”. The direction of the response is shown as increasing (+) or decreasing (−) according to the model, for factors significant at p < 0.01. As additional information, the direction of response for factors significant at p < 0.05 is shown as superscript. For effect of area, the signs indicate the relative difference between the concerned area and the no-take area. The last column shows the share of total deviance explained by each model
| Response variable | Explanatory variables | Deviance explained (%) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Covariates | Effect of Secchi depth | Effect of area | |||||||||||
| Depth | Temp. | SWM | Salinity | HighE1 | HighE2 | IM1 | IM2 | IM3 | IM-R | LowE | |||
| Abundance and biomass | |||||||||||||
| Total biomass | – | (+) | ns | – | ns | ns | (−) | ns | ns | (−) | ns | 24 | |
| Total abundance | – | – | (+) | (−) | – | – | – | – | – | – | – | – | 30.9 |
| Biomasses per species groups | |||||||||||||
| Piscivores (all species) | – | (+) | (−) | – | – | ns(−) | (−) | (−) | ns | ns(−) | (−) | ns | 32.5 |
| Perch | – | ns(+) | ns(−) | ns | ns | (−) | ns | (−) | ns | ns(−) | (−) | ns | 37.6 |
| Pikeperch | (+) | – | – | (−) | (−) | – | – | – | – | – | – | – | 25.1 |
| Non-piscivores (all species) | – | – | (+) | (−) | (−) | – | – | – | – | – | – | – | 25.7 |
| Cyprinids | ns(−) | – | ns(−) | (−) | (−) | – | – | – | – | – | – | – | 32 |
| Other non-piscivores (than Cyprinids) | (+) | – | (+) | (+) | – | ns | ns | (−) | ns | ns(−) | ns(−) | ns | 53.5 |
| Fish sizes | |||||||||||||
| Mean weight (all fish) | – | – | (−) | – | – | (−) | (−) | (−) | (−) | (−) | (−) | (−) | 31.8 |
| Mean weight perch | – | – | ns | – | – | (−) | (−) | (−) | (−) | (−) | (−) | ns(−) | 22 |
| Mean weight other species (than perch) | (+) | – | – | – | – | ns | ns | (−) | ns | (−) | ns | ns | 15.6 |
| Large perch | – | ns | (−) | – | – | (−) | (−) | (−) | (−) | (−) | (−) | (−) | 38.7 |
| Indicators (abundance based) | |||||||||||||
| Cyprinid indicator | (−) | – | (+) | (−) | – | – | – | – | – | – | – | – | 41.5 |
| Piscivore indicator | – | (+) | – | – | – | ns | ns | ns | ns | ns | (−) | ns | 12 |