Seasonal variations and quantities of amino acids were determined in nine species of aquatic plants in two eutrophic-alkalitrophic lakes in central Minnesota--Clear Lake and Blue Lake, and relationship of amino acids in the accumulating sediments was studied. Alanine is fairly stable and abundant; cystine, valine, and glutamic acid fairly stable and moderately abundant; arginine and aspartic acid moderately stable and moderately abundant; threonine moderately stable but not abundant; lysine, serine, and histidine fairly unstable but moderately abundant; phenylalanine and tyrosine fairly unstable and not abundant. Amino acids show downward concentration in sediments at shallow depths.

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