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THE UPTAKE AND RELEASE OF INORGANIC PHOSPHORUS BY DAPHNIA MAGNA STRAUS
Author(s) -
Rigler F. H.
Publication year - 1961
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1961.6.2.0165
Subject(s) - daphnia magna , phosphorus , environmental chemistry , chemistry , excretion , biology , biochemistry , toxicity , organic chemistry
Radio‐chemical and chemical studies of the uptake of inorganic phosphorus by Daphnia magna have shown that an apparent direct uptake of 2.2 ✕ 10 −3 µ g/animal/hr of PO 4 ·P from solution is caused by epizootic bacteria, which depend on organic substrates in the water for their activities. It is not known whether or not this phosphorus is available to D. magna. D. magna loses inorganic phosphorus to the ambient medium at the rate of 8.4 ✕ 10 3 µ g/animal/hr. Loss of phosphorus is independent of epizootic bacteria and production of feces. No loss of organic phosphorus was detected. Although the excretion of phosphatase by D. magna was confirmed, the regeneration of inorganic phosphorus due to hydrolysis of naturally‐occurring organic phosphorus compounds is negligible compared with the direct release of inorganic phosphorus by D. magna.