Air Quality Criteria for Lead Volume II of II - (NEPIS)(EPA) - US ...

Table AX7-2.5.1. Ecological Attributed Studies by Maret et al. (2003)
in the Coeur d’Alene Watershed
Ecological Attribute Subcategory Measure
Landscape condition Areal extent
landscape pattern
Biotic Condition Organism condition
population structure/
dynamics
Chemical/physical
characteristics
Chemical/physical
parameters
AX7-197
Basin area (km 2 )
Production mine density/km 2
Ecological processes — None measured
Hydrology/geomorphology Channel morphology
and distribution
Caddisfly tissue concentrations (mg/kg)
Number of EPT taxa
Density of EPT individuals (no./m 2 )
Dissolved oxygen (mg/L)
Specific conductance (µS/cm)
Water temperature (E ΕC)
pH
Water hardness (mg/L)
Total NO3 (mg/L)
Total P (mg/L)
Dissolved NH 3 (mg/L)
Sediment Cd, Pb, Zn (mg/kg)
Dissolved Cd, Pb, Zn in water (mg/L)
Site elevation (m)
Stream gradient (%)
Stream discharge (m 3 /s)
Stream width (m)
Stream depth (m)
Open canopy (%)
Stream velocity (m/s)
Embeddedness (%)
Dominant substrate (mm)
Natural disturbance regimes — None measured
tissue, r 2 = 0.64. Although temperature was significantly different between reference and
mine-affected sites, temperature conditions were concluded to be non-limiting to aquatic life.
For example, reference and mine-affected sites had at least 15 and 13 obligate cold-water taxa,
respectively.
A significant negative correlation between Pb in the water column (0.5 to 30 µg/L
dissolved) and total taxa richness, EPT taxa richness, and the number of metal-sensitive mayfly