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

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Figure 20. Relation between fish assemblages (nonmetric dimensional scaling first axis ordination scores) and (A) urban intensity index (UII), (B) toxic equivalents (TEQ) from semipermeable membrane devices, (C) summer dissolved oxygen (DO) concentrations and (D) the number of falling hydrologic events (PeriodF5), Willamette River basin and surrounding area, Oregon and Washington.

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