Appendix B (TABLE B1). Site variable means (mean and standard deviation of environmental, physical habitat, water chemistry, and invertebrate variables for sampled sites). Invertebrate tolerance was summarized by both national and regional tolerance values.
Study Units | National | Coastal Plains | |||||
GCP | DLMV | ||||||
Number sites | 226 | 29 | 25 | ||||
Parameters | Mean | SD | Mean | SD | Mean | SD | |
Watershed/Landscape | |||||||
Drainage Area (km²) | 323.98 | 706.94 | 145.86 | 53.31 | 15.04 | 8.50 | |
Basin Elevation (m) | 521.24 | 516.04 | 106.72 | 23.37 | 15.34 | 3.35 | |
Base Flow Index | 51.98 | 14.87 | 50.95 | 7.20 | 58.96 | 4.01 | |
Basin agriculture (%) | 46.39 | 28.14 | 32.25 | 15.49 | 61.04 | 15.79 | |
Basin cropland (%) | 33.35 | 28.40 | 24.30 | 14.67 | 43.43 | 12.20 | |
Riparian forested wetland (%) | 5.93 | 11.93 | 35.55 | 6.67 | 4.20 | 5.55 | |
Water chemistry/Temperature | |||||||
Dissolved inorganic nitrogen (mg/l) | 1.70 | 1.95 | 0.70 | 0.78 | 3.29 | 2.51 | |
Conductivity (µsm) | 389.35 | 239.37 | 105.48 | 70.36 | 142.60 | 47.68 | |
Excess conductivity (µsm) | 119.79 | 137.94 | 20.96 | 15.26 | 87.95 | 40.53 | |
Total phosphorus (mg/l) | 0.15 | 0.24 | 0.04 | 0.01 | 0.11 | 0.12 | |
Suspended organic carbon (mg/l) | 1.26 | 2.04 | 0.82 | 0.61 | 2.41 | 3.85 | |
Total suspended solids (mg/l) | 33.72 | 76.52 | 14.78 | 6.51 | 26.48 | 85.67 | |
Temperature (°C) | 20.81 | 3.58 | 21.97 | 1.30 | 19.45 | 2.03 | |
Invertebrate metrics | |||||||
EPT richness | 10.33 | 4.77 | 9.79 | 2.54 | 6.32 | 2.43 | |
Mean invertebrate tolerance-national | 5.06 | 0.82 | 5.20 | 0.26 | 4.82 | 1.02 | |
Intolerant individuals (%)-national | 32.06 | 21.77 | 24.23 | 11.44 | 19.44 | 15.25 | |
Mean invertebrate tolerance-regional | 5.10 | 1.06 | 5.76 | 0.33 | 5.93 | 0.67 | |
Intolerant individuals (%)-regional | 39.15 | 28.30 | 15.82 | 11.14 | 10.14 | 11.05 | |
Stream habitat | |||||||
Cobble and gravel (%) | 24.51 | 28.36 | 2.13 | 6.32 | 1.33 | 4.94 | |
Woody Debris (%) | 20.01 | 22.73 | 58.31 | 24.20 | 15.34 | 17.29 | |
Not embedded (%) | 33.46 | 33.03 | 3.16 | 5.00 | 67.85 | 44.59 | |
D84 (cm)/hydraulic radius | 249.43 | 421.01 | 20.09 | 70.76 | 25.64 | 59.48 | |
Channel shear stress (Pa) | 9.04 | 17.96 | 2.52 | 1.61 | 3.84 | 7.48 | |
Water surface gradient | 0.00327 | 0.00515 | 0.00086 | 0.00051 | 0.00191 | 0.00248 | |
Proportion riffle habitat | 13.41 | 17.22 | 0.01 | 0.03 | 0.00 | 0.02 | |
Study Units | Western Arid | Midwest Plains | |||||
CCYK | USNK | CNBR | |||||
Number sites | 29 | 29 | 26 | ||||
Parameters | Mean | SD | Mean | SD | Mean | SD | |
Watershed/Landscape | |||||||
Drainage Area (km²) | 652.01 | 1421.79 | 839.52 | 1104.95 | 410.87 | 398.95 | |
Basin Elevation (m) | 697.58 | 343.60 | 1642.53 | 357.60 | 654.68 | 127.95 | |
Base Flow Index | 57.90 | 13.46 | 75.63 | 4.30 | 41.53 | 8.42 | |
Basin agriculture (%) | 35.93 | 30.80 | 20.04 | 24.74 | 47.46 | 24.32 | |
Basin cropland (%) | 30.64 | 27.63 | 15.07 | 19.44 | 46.70 | 24.41 | |
Riparian forested wetland (%) | 1.38 | 2.15 | 1.28 | 1.92 | 2.70 | 3.16 | |
Water chemistry/Temperature | |||||||
Dissolved inorganic nitrogen (mg/l) | 1.19 | 1.34 | 0.72 | 0.96 | 1.67 | 1.13 | |
Conductivity (µsm) | 321.83 | 123.98 | 459.07 | 299.62 | 571.81 | 222.38 | |
Excess conductivity (µsm) | 75.83 | 57.33 | 173.54 | 238.23 | 200.15 | 199.03 | |
Total phosphorus (mg/l) | 0.11 | 0.08 | 0.05 | 0.04 | 0.66 | 0.41 | |
Suspended organic carbon (mg/l) | 0.70 | 0.56 | 0.43 | 0.28 | 4.13 | 2.19 | |
Total suspended solids (mg/l) | 20.90 | 30.44 | 13.97 | 11.66 | 167.43 | 148.75 | |
Temperature (°C) | 18.89 | 3.26 | 18.67 | 3.33 | 23.55 | 2.93 | |
Invertebrate metrics | |||||||
EPT richness | 10.41 | 4.78 | 11.41 | 4.99 | 5.80 | 2.66 | |
Mean invertebrate tolerance-national | 5.52 | 0.53 | 4.49 | 0.58 | 5.47 | 0.71 | |
Intolerant individuals (%)-national | 46.55 | 25.26 | 45.39 | 22.56 | 10.91 | 14.86 | |
Mean invertebrate tolerance-regional | 5.03 | 1.10 | 5.09 | 1.25 | 4.52 | 0.53 | |
Intolerant individuals (%)-regional | 47.46 | 24.68 | 45.86 | 21.92 | 48.24 | 23.26 | |
Stream habitat | |||||||
Cobble and gravel (%) | 47.84 | 28.08 | 37.88 | 25.23 | 0.00 | 0.00 | |
Woody Debris (%) | 4.52 | 6.92 | 4.61 | 6.28 | 22.18 | 19.50 | |
Not embedded (%) | 42.08 | 23.89 | 42.37 | 25.65 | 1.36 | 2.47 | |
D84 (cm)/hydraulic radius | 395.68 | 389.05 | 454.37 | 461.41 | 6.83 | 16.80 | |
Channel shear stress (Pa) | 19.01 | 11.58 | 27.33 | 41.82 | 3.34 | 2.41 | |
Water surface gradient | 0.00763 | 0.00741 | 0.00786 | 0.00922 | 0.00108 | 0.00059 | |
Proportion riffle habitat | 0.32 | 0.40 | 0.81 | 1.36 | 0.00 | 0.00 | |
Study Units | Midwest Plains | ||||||
OZRK | UMIS | WHMI | |||||
Number sites | 30 | 29 | 29 | ||||
Parameters | Mean | SD | Mean | SD | Mean | SD | |
Watershed/Landscape | |||||||
Drainage Area (km²) | 170.92 | 95.79 | 230.87 | 126.28 | 98.40 | 67.44 | |
Basin Elevation (m) | 344.43 | 72.65 | 357.47 | 57.98 | 301.28 | 34.36 | |
Base Flow Index | 38.66 | 6.92 | 57.81 | 6.25 | 34.73 | 8.07 | |
Basin agriculture (%) | 38.00 | 22.80 | 56.03 | 21.45 | 82.77 | 6.81 | |
Basin cropland (%) | 0.47 | 1.59 | 34.22 | 23.79 | 75.85 | 13.22 | |
Riparian forested wetland (%) | 0.72 | 0.83 | 1.02 | 1.14 | 0.23 | 0.97 | |
Water chemistry/Temperature | |||||||
Dissolved inorganic nitrogen (mg/l) | 0.71 | 1.12 | 1.90 | 2.59 | 3.67 | 1.69 | |
Conductivity (µsm) | 365.27 | 70.00 | 510.07 | 186.78 | 624.31 | 113.52 | |
Excess conductivity (µsm) | 52.73 | 20.41 | 149.22 | 123.47 | 204.14 | 71.31 | |
Total phosphorus (mg/l) | 0.02 | 0.02 | 0.12 | 0.08 | 0.13 | 0.11 | |
Suspended organic carbon (mg/l) | 0.16 | 0.18 | 1.15 | 1.83 | 0.76 | 0.88 | |
Total suspended solids (mg/l) | 12.02 | 12.38 | 17.16 | 27.87 | 10.59 | 5.42 | |
Temperature (°C) | 24.38 | 3.15 | 19.36 | 4.06 | 20.19 | 2.64 | |
Invertebrate metrics | |||||||
EPT richness | 14.50 | 3.00 | 11.93 | 6.73 | 11.14 | 2.45 | |
Mean invertebrate tolerance-national | 5.38 | 0.58 | 4.87 | 1.19 | 4.83 | 0.51 | |
Intolerant individuals (%)-national | 44.19 | 16.71 | 27.98 | 19.73 | 33.47 | 15.94 | |
Mean invertebrate tolerance-regional | 5.08 | 0.71 | 5.77 | 0.90 | 3.66 | 0.51 | |
Intolerant individuals (%)-regional | 34.72 | 16.70 | 23.13 | 17.32 | 84.92 | 8.95 | |
Stream habitat | |||||||
Cobble and gravel (%) | 59.99 | 19.33 | 11.84 | 18.82 | 28.12 | 20.08 | |
Woody Debris (%) | 2.60 | 4.65 | 28.29 | 16.62 | 24.38 | 11.50 | |
Not embedded (%) | 73.30 | 6.96 | 11.02 | 12.22 | 26.60 | 14.45 | |
D84 (cm)/hydraulic radius | 646.97 | 629.42 | 69.47 | 175.33 | 306.68 | 430.02 | |
Channel shear stress (Pa) | 8.17 | 3.85 | 3.30 | 3.84 | 3.48 | 2.93 | |
Water surface gradient | 0.00309 | 0.00127 | 0.00122 | 0.00113 | 0.00210 | 0.00226 | |
Proportion riffle habitat | 0.40 | 0.33 | 0.13 | 0.14 | 0.29 | 0.45 |