Quantification of Landscape Indicators/Aquatic Resource Associations in the Savannah River Basin
VARIABLE DESCRIPTION USED IN STATISTICAL ANALYSES
Table 1. Water chemicalbiological and landscape metrics used in the statistical analyses. Letters "c" and "p" denote variables included in canonical and PLS analyses.
Variable Type/Name 
Description



Water Chemical Metrics  
pH (c) 
pH


EC (c) 
Electrical Conductivity, microSiemens per centimeter
(FS/cm)


DO (c) 
Dissolved Oxygen, mg per liter




Water Biological Metrics


Hab (c,p) 
Macroinvertebrate habitat.


EPT (c,p) 
Taxa richness of sensitive insects to pollution;
EPT stands for EphemeropteraPlecopteraTrichoptera Index. These
insects are correlated with good water quality (Lenat, 1987) based
on 100organism subsample, nonimpacted (>10), slightly impacted
(610), moderately impacted (25) and severely impacted (01).


Rich (c,p) 
Macroinvertebrate richness, species richness (SPP).
Total number of species in a sample. Condition of areas are classified
as: non impacted (>26), slightly impacted (1926), moderately
impacted (1118), severely impacted (<11).


AGPT (c,p) 
Algal Growth Potential Test


IBI (c,p) 
Fish Index of Biotic Integrity (Karr, 1981)




Landscape Metrics 
Percent area in a HUC


Pct_crop (c,p) 
Percentage of total MRLC landcover in row crops
types


Pct_past (c,p) 
Percentage of total MRLC landcover in pasture/grassland
types


Pct_wtr (c,p) 
Percentage of total MRLC landcover in water types


Pct_wet (c,p) 
Percentage of total MRLC landcover in wetland types


Pct_bar (c,p) 
Percentage of total MRLC landcover in barren types
(quarries, strip mines)


Pct_urb (c,p) 
Percentage of total MRLC landcover in urban types


Pct_for (c,p) 
Percentage of total MRLC landcover in forest types


Crop_slp (c,p) 
Percent of total area in row crops on slopes greater
than 3 percent


Crop_slp_mod (c,p) 
Percent of total area in row crops on slopes greater
than 3 percent and on moderately erodible soils (STATSGO Kfactor
$ 0.2 and < 0.4)


Ag_hi (c,p) 
Percent of total area in agriculture (row crops
+ pasture) on highly erodible soils (STATSGO Kfactor $
0.4)


Ag_slp (c,p) 
Percent of total area in agriculture (row crops+pasture)
on slopes greater than 3 percent


Ag_slp_hi (c,p) 
Percent of total area in agriculture (row crops
+ pasture) on slopes greater than 3 percent and on highly erodible
soils (STATSGO Kfactor $ 0.4)


Ag_mod (c,p) 
Percent of total area in agriculture (row crops
+ pasture) on moderately erodible soils (STATSGO Kfactor $
0.2 and < 0.4)


Ag_slp_mod (c,p) 
Percent of total area in agriculture (row crops
+ pasture) on slopes greater than 3 percent and on moderately erodible
soils (STATSGO Kfactor $ 0.2 and <
0.4)


Past_slp (c,p) 
Hay pasture on slopes greater than 3 percent


Bar_slp_hi (c,p) 
Percent of total area in barren cover types on slopes
greater than 3 percent and on highly erodible soils (STATSGO Kfactor
$ 0.4)


Bar_slp_mod (c,p) 
Barren on slopes > 3% and on moderately erodible
soils


Soil_er (c,p) 
Percent of total area with highly erodible soils
(STATSCO Kfactor $0.4)


Mean_slp (c) 
Mean or average percent slope


Slope3 (c,p) 
1 Percent of total area with slopes greater than
3 percent


Slp_mod (c,p) 
Percent of total area with moderately erodible soils
(STATSGO Kfactor $ 0.2 and < 0.4)
and slope greater than 3 percent


Sd_slp (c) 
Standard deviation of percent slope


Strmden (c,p) 
Stream density as total length of streams from USGS
TIGER data


Totroad30 (c,p) 
Total length of type 1 (interstate) roads within
30 m of streams from USGS TIGER data
Total length of type 2 (interstate) roads within 30 m of streams from USGS TIGER data Total length of type 3 (interstate) roads within 30 m of streams from USGS TIGER data Total length of type 4 (interstate) roads within 30 m of streams from USGS TIGER data Total length of railroads within 30 m of streams from USGS TIGER data Total length of railroad sidings within 30 m of streams from USGS TIGER data 

TotroadWs (c,p) 
Total length of type 1 (interstate) roads from USGS
TIGER data
Total length of type 2 (interstate) roads from USGS TIGER data Total length of type 3 (interstate) roads from USGS TIGER data Total length of type 4 (interstate) roads from USGS TIGER data Total length of type 0 (trails) roads from USGS TIGER data 

PwrPipTl (c,p) 
Total length of power lines within 30 m of streams
from USGS TIGER data
Total length of pipe lines within 30 m of streams from USGS TIGER data Total length of telephone lines from USGS TIGER data 
