Effects of Urbanization on Stream Ecosystems in the Willamette River Basin and Surrounding Area, Oregon and Washington

Scientific Investigations Report 2006–5101–D

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5101–D

Figure - refer to figure caption for alternative text description

Figure 18. Benthic macroinvertebrate nonmetric dimensional scaling ordination axis 1 scores in relation to (A) urban intensity index (UII), (B) summer dissolved oxygen concentrations, (C) percentage of flat and low elevation land in watershed and (D) and toxic equivalents from semipermeable membrane devices, Willamette River basin and surrounding area, Oregon and Washington.

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