Associated Use Attainment Response between Multiple Aquatic Assemblage Indicators for Evaluating Catchment, Habitat, Water Quality, and Contaminants

Table 5

Results of factor analysis and explained variance observed in fish assemblage biologic structure and 16 significant chemical, habitat, and land use variables at the Big Oaks National Wildlife Refuge. Bold values are considered significant.

Variable	Factor 1	Factor 2	Factor 3	Factor 4
Fish assemblage
Arsenic	0.783062	−0.059175	−0.0345	0.31648
Total phosphorus	0.851726	−0.017708	0.112252	−0.1624
Agricultural land use	0.836643	0.074086	−0.01429	0.063424
QHEI score	−0.08335	0.929388	0.033943	0.286131
QHEI—gradient score	0.251651	0.719733	0.279072	−0.10598
Conductivity	−0.22656	−0.042178	0.753321	−0.04346
Calcium	0.246242	0.219824	0.739182	0.033972
QHEI—instream cover score	0.001361	0.146698	0.036967	0.8519
Cumulative explained variance	26%	49%	60%	69%
Macroinvertebrate assemblage
Barium	−0.80031	0.002714
Lead	−0.74591	−0.193511
Manganese	−0.91379	0.028777
Fluoride	−0.06312	−0.80045
Cumulative explained variance	38%	56%
Crayfish assemblage
Chloride	0.821893	0.220021
Nitrogen	0.769671	0.270388
Total phosphorus	0.811131	0.198719
Total solids	0.818145	−0.221031
QHEI—pool glide score	0.119627	0.909592
Cumulative explained variance	49%	66%