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Scientific Investigations Report 2009–5078

Assessment of Eutrophication in the Lower Yakima River Basin, Washington, 2004–07

Table 14. Linear relations between gross primary productivity and environmental factors in the Yakima River at Kiona (RM 30), Washington, March 1–June 30, 2005–07.

[r2 values are shown only for significant relations (p ≤ 0.05). Abbreviations: r2, coefficient of determination; ≤, less than or equal to; –, not significant]

Environmental factor r2 value,
all data
r2 value, data
corresponding to first
quartile of streamflow
Photoperiod 0.12 0.66
Daily mean photosynthetically active radiation 0.64
Daily maximum water temperature 0.43 0.80

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201

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