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Summary
“Yellow pigmented” bacteria chiefly consisting of Flavobacterium species and nonfruiting myxobacteria have been observed as an essential constituent of bacterioplankton in lakes. In eutrophic Mindel Lake (near Constance, BRD) aerobic myxobacteria of allochthonous origin had produced a bacterial waterbloom which persisted longer than 2 months.
Isolated strains did not form fruiting bodies under the employed culture conditions and were in most features identical to “Sporocytophaga cauliformis” Knorr & Gräf. These bacteria did not only grow at 0° C, but had a continuous optimum for growth below 20° C.
Producing an overplus of alkaline phosphatases they had a marked effect on hydrolysis of phosphates. In spite of their psychrophilic habit synthesis of alkaline phosphatases did not vary at different growth temperatures, and optimum activities were found near 36° C.
Pure culture experiments were undertaken to estimate catalytic efficiencies of phosphate mineralization which could be attributed to standing crops of Myxobacteria in lake water.