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

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Figure 10. Relation of the timing of the onset of the bloom to the median June lake level and cumulative degree-days between April 1 and May 15, Upper Klamath Lake, Oregon, 1990–2006. The Julian day of the bloom onset was interpolated from the measured data as the day when the lakewide median chlorophyll-a concentration exceeded 20 micrograms per liter. For lake level, no significant correlation was found. For degree-days, Spearman’s ρ correlation coefficient = 0.65, p < 0.004.

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