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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 1011

Suzuki Takao and Kurihara Yasushi; Studies on the interactions between protozoan species in the continuous cultures. Suishituodaku Kenkyu 7(7):431-436, 1984

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The population dynamics were studied when another protozoan is inoculated into a continuous culture system containing bacteria and a protozoan, which has already reached its steady state. The protozoa used in this experiment were Cyclidium sp., Tetrahymena pyriformis, and Vorticella microstoma. The interaction between protozoan species were also studied when the pre-existing and the inoculating protozoan species is changed. The cultures were maintained at dilution rates of 3 and 6 day-1. Cyclidium sp. was found to establish more easilier than any other protozoa in all the culture systems at both dilution rates. At dilution rate of 3 day-1, Cyclidium sp. was followed by T. pyriformis and V. microstoma, whereas at dilution rate of 6 day-1, Cyclidium sp. was followed by V. microstoma and T. pyriformis. The probable factors, such as growth kinetics (u(max), Ks), attachment to bacterial flocs, number of organisms inoculated, and competition for food, etc., which can be used explain above results are discussed in detail.