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UPTAKE AND RELEASE OF DISSOLVED ORGANIC PHOSPHORUS BY REPRESENTATIVES OF A COASTAL MARINE ECOSYSTEM 1, 2
Author(s) -
Johannes R. E.
Publication year - 1964
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.1964.9.2.0224
Subject(s) - benthic zone , phosphorus , bacteria , phosphate , environmental chemistry , marine bacteriophage , diatom , chemistry , alkaline phosphatase , algae , biology , ecology , biochemistry , enzyme , organic chemistry , genetics
A benthic diatom, a benthic amphipod, and mixed species of marine bacteria were used in studies of the uptake and release of dissolved organic phosphorus (DOP) using the radionuclide P 32 . Over one‐third of the soluble phosphorus released by the amphipod was in organic form (0.79 µ g‐at. DOP/g of animal per hr). Marine bacteria utilized 80% of this DOP. Thirty per cent was hydrolyzed in sterile media, possibly by alkaline phosphatase released by the amphipods. Bacteria‐free diatoms released little DOP during growth, but released 20% of their total phosphorus as DOP after growth had ceased. Growing diatoms could reabsorb 40% of this DOP. Marine bacteria were able to absorb 92% of it. No regeneration of dissolved inorganic phosphate (DIP) from DOP in the presence of bacteria was observed. Marine bacteria, living or dead, released very little DOP.