Open Access
Table 1
The t-test analysis for environmental parameters: comparison of sampling sites in which Pseudorasbora parva was present and those in which it was absent. p < 0.05 is in bold.
| Environmental parameters |
P. parva absence |
P. parva presence |
||||||
|---|---|---|---|---|---|---|---|---|
| N values | Mean (±St. Dev.) | N values | Mean (±St. Dev.) | Minimum | Maximum | t value | p | |
| Distance from the source (km) | 382 | 20.624 ± 25.601 | 64 | 70.460 ± 61.739 | 4.000 | 216.000 | 9.643 | 0.000 |
| Watershed area (km2) | 382 | 187.282 ± 432.977 | 64 | 945.810 ± 1459.871 | 15.700 | 6349.700 | 9.736 | 0.000 |
| Altitude (m a.s.l.) | 391 | 317.349 ± 143.001 | 65 | 183.803 ± 73.613 | 42.000 | 410.000 | 7.988 | 0.000 |
| Average slope (%) | 388 | 2.188 ± 1.727 | 66 | 2.05 ± 1.850 | 0.160 | 9.800 | 0.750 | 0.453 |
| pH (units) | 397 | 8.074 ± 1.110 | 68 | 8.042 ± 0.300 | 7.110 | 8.920 | 1.076 | 0.283 |
| Conductivity (μs.cm-1 at 25°C) | 396 | 570.441 ± 197.189 | 68 | 777.935 ± 326.037 | 400.000 | 2220.000 | 3.840 | 0.000 |
| BOD5 (mg.L-1) | 367 | 1.749 ± 2.140 | 66 | 3.376 ± 2.817 | 0.600 | 21.000 | 6.786 | 0.000 |
| COD (mg.L-1) | 341 | 8.501 ± 8.798 | 62 | 9.889 ± 5.556 | 0.339 | 46.000 | 2.920 | 0.004 |
| NNO3 (mg.L-1) | 389 | 1.689 ± 3.041 | 68 | 2.289 ± 2.030 | 0.057 | 10.600 | 4.114 | 0.000 |
| NNO2 (mg.L-1) | 389 | 0.033 ± 0.099 | 68 | 0.063 ± 0.112 | 0.003 | 0.760 | 2.829 | 0.005 |
| NNH3 (mg.L-1) | 390 | 0.229 ± 1.555 | 68 | 0.205 ± 0.290 | 0.006 | 12.300 | 2.952 | 0.003 |
| SO4 (mg.L-1) | 389 | 52.668 ± 59.948 | 68 | 72.217 ± 39.284 | 16.000 | 278.000 | 5.640 | 0.000 |
| PPO4 (mg.L-1) | 351 | 0.059 ± 0.098 | 59 | 0.132 ± 0.199 | 0.003 | 1.820 | 5.779 | 0.000 |
| Ptot (mg.L-1) | 345 | 0.073 ± 0.128 | 64 | 0.165 ± 0.224 | 0.003 | 2.200 | 5.644 | 0.000 |
| Cl (mg.L-1) | 389 | 18.894 ± 18.929 | 68 | 31.878 ± 20.092 | 10.300 | 120.000 | 7.427 | 0.000 |
| Water temperature (°C) | 378 | 13.867 ± 4.699 | 63 | 17.380 ± 4.764 | 6.300 | 28.300 | 5.093 | 0.000 |
| Dissolved oxygen (mg.L-1) | 383 | 9.373 ± 2.192 | 66 | 8.416 ± 2.617 | 1.970 | 17.000 | 4.196 | 0.000 |
| Extended Biotic Index (EBI) | 380 | 7.826 ± 2.018 | 65 | 6.811 ± 1.237 | 3.000 | 9.000 | 5.484 | 0.000 |
| EBI Quality Class | 388 | 2.328 ± 0.831 | 66 | 2.846 ± 0.718 | 2.000 | 5.000 | 4.258 | 0.000 |
| Width (m) | 330 | 6.531 ± 6.376 | 42 | 12.868 ± 7.359 | 0.800 | 28.500 | 6.405 | 0.000 |
| Depth (m) | 316 | 0.343 ± 0.230 | 40 | 0.493 ± 0.289 | 0.100 | 1.700 | 4.085 | 0.000 |
| Average current speed (m.s-1) | 351 | 0.283 ± 0.272 | 45 | 0.214 ± 0.135 | 0.035 | 0.718 | 1.406 | 0.160 |
| Flow rate (m3.s-1) | 364 | 0.810 ± 1.533 | 47 | 1.197 ± 1.351 | 0.002 | 5.600 | 1.716 | 0.087 |
| Wetted river section (m2) | 344 | 1.729 ± 2.348 | 45 | 3.904 ± 3.654 | 0.052 | 16.088 | 5.652 | 0.000 |
| Average shaded surface (units) | 394 | 2.303 ± 1.418 | 66 | 1.303 ± 1.336 | 0.000 | 4.000 | 5.656 | 0.000 |
| Cover (units) | 393 | 2.458 ± 1.150 | 66 | 2.197 ± 1.292 | 0.000 | 4.000 | 2.141 | 0.033 |
| Canopy cover (units) | 388 | 0.948 ± 1.050 | 65 | 0.923 ± 1.108 | 0.000 | 4.000 | 0.397 | 0.692 |
| Substrate size (units) | 398 | 4.848 ± 2.356 | 68 | 4.179 ± 2.480 | 1.000 | 7.000 | 2.128 | 0.034 |
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