Scientific Investigations Report 2006–5101–D
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5101–D
Figure 14. Relation between the urban intensity index (UII) and (A) chlorophyll-a and (B) ash-free dry mass, Willamette River basin and surrounding area, Oregon and Washington. (Shading represents concentrations of chlorophyll-a, greater than 100 mg/m2).