Table 2.
Environmental conditions among quantitative sampling sites.
| Variable | Mean | SD | Range |
|---|---|---|---|
| Wetted width (m) | 10.8 | 8.2 | 2.0–34.5 |
| Water depth (m) | 0.34 | 0.17 | 0.06–0.94 |
| Current velocity (m/s) | 0.30 | 0.14 | 0.04–0.68 |
| pH | 7.6 | 0.3 | 7.0–8.1 |
| % sand | 13.5 | 11.2 | 0–56.7 |
| % gravel | 44.6 | 17.8 | 13.3–88.8 |
| % cobble | 41.4 | 22.7 | 0–85.8 |
| Sinuosity index | 1.04 | 0.13 | 1.0–1.99 |
| Water surface slope (m/m) | 0.008 | 0.006 | 0.002–0.023 |
| τ0(g/cm2) | 0.38 | 0.32 | 0.05–1.72 |
| τmin (g/cm2) | 0.24 | 0.22 | 0.03–1.21 |
| τmax (g/cm2) | 0.55 | 0.48 | 0.06–2.44 |
| Dcrit (mm) | 11.7 | 10.0 | 1.4–53.3 |
| Dmin (mm) | 7.7 | 6.8 | 0.8–37.4 |
| Dmax (mm) | 17.1 | 14.7 | 1.9–75.4 |