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 11. Relations between Pesticide Toxicity Index (PTI) and (A) urban intensity index (UII) and (B) road density (ROADDEN), Willamette River basin and surrounding area, Oregon and Washington.

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