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RELATIONSHIPS BETWEEN WATER QUALITY AND PHOSPHORUS CONCENTRATIONS FOR PUGET SOUND REGION LAKES 1
Author(s) -
Gilliom Robert J.
Publication year - 1984
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1984.tb04726.x
Subject(s) - secchi disk , water quality , chlorophyll a , confidence interval , environmental science , hydrology (agriculture) , chlorophyll , phosphorus , zoology , nutrient , eutrophication , mathematics , biology , ecology , chemistry , statistics , botany , geology , geotechnical engineering , organic chemistry
Regression relationships were developed between summer mean total phosphorus (P) concentrations in near‐surface water and both chlorophyll a concentrations and Secchi disc transparency for Puget Sound region lakes. Total P concentrations in the lakes studied ranged from 7 to 66 μ/L. The relationship between total P and chlorophyll a , based on data from 69 lakes, explained 57 percent of the variance in chlorophyll a . Predicted chlorophyll a concentrations and 95 percent confidence intervals ranged from 1 +3 ‐0.5 μg/L for 7 μg/L P to about +35 ‐10 μ/L for 66 μ/L P. The relationship between total P and Secchi disc, based on data from 71 lakes, explained 53 percent of the variance in Secchi disc. Predicted Secchi disc transparencies and 95 percent confidence intervals ranged from 5.5 +5.5 ‐3.0 m for 7 μ/L P to 1.4 +1.5 ‐0.7 m for 66 μ/L P.