Table 1 Fish community metrics, score values, and the index of biological integrity (IBI) for each group in the mesohabitats and land-use pattern
Category | Model metrics | Expected response | Mesohabitat pattern | Land-use pattern | ||||
|---|---|---|---|---|---|---|---|---|
Ri-Ds (n = 5) | Ru-Ds (n = 5) | Po-Ds (n = 5) | Fo-L (n = 5) | Ag-L (n = 5) | Ur-L (n = 5) | |||
Ecological characteristics: species richness and composition | M1: total number of native species | Decrease | 4.6 ± 0.89 | 3.4 ± 1.67 | 1.4 ± 0.89 | 4.6 ± 0.89 | 3.4 ± 1.67 | 2.2 ± 1.09 |
M2: total number of riffle-benthic species | Decrease | 3 ± 1.41 | 1.8 ± 1.09 | 1 ± 0 | 3 ± 1.41 | 1.4 ± 0.89 | 1 ± 0 | |
M3: total number of sensitive species | Decrease | 4.2 ± 1.09 | 1.8 ± 1.09 | 1 ± 0 | 4.2 ± 1.09 | 1.4 ± 0.89 | 1 ± 0 | |
M4: proportion of individuals as tolerant species | Increase | 3.4 ± 1.67 | 1 ± 0 | 1 ± 0 | 3.4 ± 1.67 | 1 ± 0 | 1 ± 0 | |
Trophic composition | M5: proportion of individuals as omnivore | Increase | 4.6 ± 0.89 | 1.8 ± 1.09 | 3 ± 2 | 4.6 ± 0.89 | 1.4 ± 0.89 | 1.8 ± 1.09 |
M6: proportion of individuals as insectivores | Decrease | 5 ± 0 | 4.2 ± 1.09 | 3 ± 2 | 5 ± 0 | 2.2 ± 2.19 | 3.4 ± 1.67 | |
Fish abundance and health condition | M7:total number of individuals | Increase | 4.6 ± 0.89 | 1.4 ± 0.89 | 1.4 ± 0.89 | 4.6 ± 0.89 | 2.6 ± 2.19 | 1 ± 0 |
M8: proportion of abnormal individual | Increase | 4.6 ± 0.89 | 4.2 ± 1.78 | 5 ± 0 | 4.6 ± 0.89 | 3.4 ± 1.78 | 3.4 ± 2.19 | |
Model values of IBI | 34 ± 0.65 | 19.6 ± 1.19 | 16.8 ± 1.35 | 34 ± 0.65 | 16.8 ± 0.88 | 14.8 ± 0.98 | ||
Mean IBI | 22.6 ± 8.13 | |||||||
Criteria of ecological health | Good-Fair | Fair-Poor | Poor-very poor | Good-Fair | Poor-very poor | Poor-very poor | ||