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U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5117

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Figure 21. Relation of lakewide median chlorophyll-a concentration to lakewide median total phosphorus concentration, by area, Upper Klamath and Agency Lakes, Oregon, June 1990–2006. Data values represent the median of measurements on each June sampling date. Spearman’s ρ correlation coefficients, all with p < 0.0001, except for Agency Lake areas, which had a p = 0.0007: Agency Lake areas = 0.52, Bay areas = 0.82, Trench area = 067, Open water areas = 0.66, Outflow areas = 0.72.

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