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Quantification of Landscape Indicators/Aquatic Resource Associations in the Savannah River Basin

VARIABLE DESCRIPTION USED IN STATISTICAL ANALYSES

Table 1.PDF File Water chemical-biological 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 Ephemeroptera-Plecoptera-Trichoptera Index. These insects are correlated with good water quality (Lenat, 1987) based on 100-organism subsample, non-impacted (>10), slightly impacted (6-10), moderately impacted (2-5) and severely impacted (0-1).
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 (19-26), moderately impacted (11-18), 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 K-factor $ 0.2 and < 0.4)
Ag_hi (c,p)
Percent of total area in agriculture (row crops + pasture) on highly erodible soils (STATSGO K-factor $ 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 K-factor $ 0.4)
Ag_mod (c,p)
Percent of total area in agriculture (row crops + pasture) on moderately erodible soils (STATSGO K-factor $ 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 K-factor $ 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 K-factor $ 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 K-factor $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 K-factor $ 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

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