Table 2
In-stream habitat structure characterization (mean and standard deviation) of sampling sites in the Langueyú stream. The redundancy test shows the non-redundant variables (pass). Non-redundant variables are highlighted. The numbers in redundant variables represent the selected informative variables accounting for their information. HQI = habitat quality index.
| N° | Variable | Code | Urban | Cropland | Livestock | Natural grassland | Redundancy Test |
|---|---|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | ||||
| 1 | Pools (%) | Pools | 0.01 (0.02) | 0.11 (0.19) | 0.25 (0.22) | 0.46 (0.13) | Pass |
| 2 | Riffles (%) | Riffles | 0.24 (0.12) | 0.15 (0.08) | 0 | 0 | 1 |
| 3 | Runs (%) | Runs | 0.75 (0.14) | 0.74 (0.11) | 0.75 (0.22) | 0.54 (0.13) | 1 |
| 4 | Backwaters (n) | Backwa | 10.67 (2.52) | 10 (6.56) | 8.33 (1.53) | 7.33 (6.51) | Pass |
| 5 | Woody debris (n) | Woodyde | 1.33 (2.31) | 0.67 (1.15) | 1 (1) | 1 (1) | Pass |
| 6 | Floating macrophytes (%) | Floatmacro | 0.01 (0.01) | 0 | 0 | 0.01 (0.01) | Pass |
| 7 | Submerged macrophytes (%) | Submacro | 0 | 0.24 (0.15) | 0.39 (0.17) | 0.04 (0.05) | Pass |
| 8 | Emergent macrophytes (%) | Emermacro | 0 | 0 | 0 | 0.01 (0.01) | Pass |
| 9 | Sediments depth min (cm) | Sdep min | 0 | 0 | 0 | 0 | 10 |
| 10 | Sediments depth average (cm) | Sdep avg | 4.94 (1.1) | 2.11 (0.91) | 1.12 (0.43) | 1.01 (0.69) | Pass |
| 11 | Sediments depth max (cm) | Sdep max | 17.67 (3.48) | 13.33 (5.24) | 8.33 (1.53) | 10.67 (8.17) | 10 |
| 12 | Substrate bedrock (%) | Subedrock | 0.15 (0.08) | 0.77 (0.08) | 0.39 (0.23) | 0.66 (0.1) | Pass |
| 13 | Substrate boulder (%) | Suboul | 0.03 (0.03) | 0.01 (0.01) | 0.07(0.03) | 0.21 (0.13) | Pass |
| 14 | Substrate gravel (%) | Subgrav | 0.7 (0.1) | 0.04 (0.04) | 0.29 (0.27) | 0.04 (0.05) | Pass |
| 15 | Substrate sand (%) | Subsand | 0.13 (0.09) | 0.18 (0.1) | 0.25 (0.11) | 0.1 (0.05) | Pass |
| 16 | Water discharge (L/s) | Wdis | 358.54 (111.92) | 267.75 (78.48) | 389.33 (193.99) | 502.57 (218.66) | 22 |
| 17 | Water velocity (m/s) | Wveloc | 0.76 (0.23) | 0.42 (0.15) | 0.34 (0.1) | 0.37(0.1) | 19 |
| 18 | Channel width min (m) | Cwid min | 4.45 (0.42) | 6.06 (0.3) | 6.04 (0.6) | 7.57 (0.35) | 19 |
| 19 | Channel width average (m) | Cwid avg | 5.12 (0.15) | 7.32 (0.97) | 9.53 (2.03) | 9.37 (0.43) | Pass |
| 20 | Channel width max (m) | Cwid max | 6.05 (0.59) | 8.69 (1.95) | 14.5 (8.67) | 11.5 (0.87) | 19 |
| 21 | Water depth min (cm) | Wdep min | 17 (4) | 13 (6) | 18 (5) | 29 (6) | 22 |
| 22 | Water depth average (cm) | Wdep avg | 36.73 (3.13) | 35.53 (5.02) | 54.78 (16.07) | 60.07 (4.87) | Pass |
| 23 | Water depth max (cm) | Wdep max | 71.78 (7.6) | 58 (11.53) | 98.11 (25.62) | 93.33 (5.89) | 22 |
| HQI Cochero et al. | HQI Coc | 3.81 (0.04) | 6.7 (0.12) | 7.15 (0.07) | 6.87 (0.37) | - | |
| HQI Barbour et al. | HQI Bar | 92.33 (1.53) | 126.67 (8.62) | 118 (9.54) | 145 (8.19) | - |
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