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Alkaline phosphatase activity and cellular phosphorus as an index of the phosphorus status of phytoplankton in Minnesota lakes
Author(s) -
GAGE MAURA A.,
GORHAM EVILLE
Publication year - 1985
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1985.tb00195.x
Subject(s) - phosphorus , phytoplankton , alkaline phosphatase , limiting , ecology , environmental chemistry , phosphorus deficiency , particulates , environmental science , biology , chemistry , nutrient , biochemistry , enzyme , mechanical engineering , organic chemistry , engineering
SUMMARY. Total alkaline phosphatase activity is inversely related to cellular phosphorus in the particulate organic matter of waters above and below the thermocline in nine Minnesota lakes. Diagnostic criteria for assessing surplus and limiting levels of phosphorus are proposed. When applied to seasonal changes in phosphorus status in Lake Josephine, they demonstrate severe phosphorus starvation in late summer and autumn.