Appendix A. Descriptions
of the spatial, land cover, and environmental variables obtained from the NLCD
and MBSS data sets, including distance-matrix assignments corresponding to matrices
used in the partial Mantel analysis, transformation applied prior to variable
inclusion into distance matrices, and summary statistics of each untransformed
variable (*N* = 295 stream sites sampled).

Variable (units) |
Distance matrix |
Transformation |
Minimum |
Maximum |
Median |
Mean |
SD |

Latitude (decimal-degrees) |
Space |
none |
38.06 |
39.62 |
38.85 |
38.82 |
0.33 |

Longitude (decimal-degrees) |
Space |
none |
76.31 |
78.22 |
77.55 |
77.33 |
0.53 |

Watershed area (ha) |
Watershed Area |
log |
8.2 |
29 929 |
2814 |
2932 |
4106 |

Developed (% watershed area) |
% Developed |
none |
0.0 |
87.7 |
4.6 |
12.8 |
19.1 |

Forested (% watershed area) |
NA |
NA |
1.8 |
100 |
43.9 |
46.9 |
19.7 |

Cropland (% watershed area) |
% Cropland |
none |
0.0 |
87.5 |
10.5 |
18.6 |
17.7 |

Wetland (% watershed area) |
% Wetland |
none |
0.0 |
35.2 |
4.6 |
7.2 |
7.5 |

Riparian shading (% canopy closure) |
Riparian |
arcsin(sqrt) |
5.0 |
99.0 |
75.0 |
68.9 |
23.8 |

Riparian remoteness (integer rating, 0–20) |
Riparian |
none |
0 |
20 |
10 |
10.3 |
5.5 |

Riparian aesthetic rating (integer rating, 0–20) |
Riparian |
none |
0 |
20 |
15 |
12.6 |
5.1 |

Riparian buffer
(minimum width, m) |
Riparian |
log |
0.0 |
50.0 |
40.0 |
31.0 |
5.5 |

Slope (%) |
Gradient |
log |
0.0 |
3.00 |
0.31 |
0.52 |
0.47 |

Mean velocity (m/s) |
Gradient |
log |
0.0 |
0.51 |
0.10 |
0.11 |
0.10 |

Velocity-depth diversity (integer rating, 0–20) |
Gradient |
none |
0 |
18 |
10 |
9.5 |
4.2 |

Maximum depth (cm) |
Size |
log |
1.5 |
200 |
61.0 |
64.6 |
33.8 |

Mean width (m) |
Size |
log |
0.05 |
23.5 |
3.7 |
4.7 |
3.8 |

Mean thalweg depth (cm) |
Size |
log |
1.5 |
84.3 |
28.0 |
31.2 |
18.4 |

Temperature (°C, field) |
Temp |
log |
11.4 |
30.9 |
20.4 |
20.5 |
3.4 |

Dissolved oxygen
(mg O |
DO |
log |
0.30 |
14.0 |
7.51 |
7.12 |
2.20 |

pH (lab) |
Acidity |
none |
4.00 |
8.87 |
6.71 |
6.69 |
0.60 |

Acid neutralizing capacity (µeq/L, lab) |
Acidity |
log |
0.0 |
2456 |
300 |
419 |
390 |

Specific conductivity (µS/cm, lab) |
Cond |
log |
38 |
2418 |
152 |
183 |
184 |

Dissolved organic carbon (mg/L, lab) |
DOC |
none |
0.9 |
32.9 |
4.8 |
5.9 |
4.3 |

Nitrate-nitrogen (mg/L, lab) |
NO |
log |
0.0 |
16.2 |
1.10 |
2.03 |
2.41 |

In-stream habitat (integer rating, 0–20) |
SubQual |
none |
0 |
19 |
11 |
10.9 |
4.5 |

Epifaunal substrate (integer rating,0–20) |
SubQual |
none |
0 |
18 |
10 |
9.1 |
4.6 |

Pool quality (integer rating,0–20) |
SubQual |
none |
1 |
20 |
13 |
11.6 |
4.4 |

Riffle quality (integer rating,0–20) |
SubQual |
none |
0 |
19 |
10 |
9.5 |
5.2 |

Embeddedness (%) |
SubQual |
arcsin(sqrt) |
0 |
100 |
80.0 |
70.1 |
31.3 |

Woody debris and root wads (total no.) |
Woody |
log |
0 |
37 |
7 |
7.9 |
6.6 |

^{†}NA = not
applicable. Percentage forested was not included in the partial Mantel analysis

^{‡}Buffer widths
>50 m were recorded as 50 m.