Ref ID : 7094
Takamura Noriko and Yasuno Masayuki; Food Selection of the Ciliated Protozoa, Condylostoma vorticella (Ehrenberg) in Lake Kasumigaura. Jap.J.Limnol. 44(3):184-189, 1983
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The food selection of a herbivorous ciliated protozoa, Condylostoma vorticella (Ehrenberg) was examined in November 1980 in Takahamairi Bay of Lake Kasumigaura, using Ivlev's (1955) electivity index. This ciliated protozoa selectively fed on Synechococcus, Kirchneriella, Dictyosphaerium, Coscinodiscus, Cryptomonas, Chlamydomonas, and Gomphosphaeria, but rejected Closterium, Phormidium, Synedra, Tetrastrum, Dactylococcopsis, Scendesmus, Aphanizomenon, Melosira, and Micractinium. The size and shape of algae were significant in the food selection, but the taxonomical groups were insignificant. The ciliate fed efficiently on food particles between 15 µm and 40 µm in size, but not filamentous and spindlelike algae or algae with long spines. Colonies of Microcystis found most abundantly in this lake were preferably ingested by the ciliate. This ciliated protozoa is likely a significant link in the food chain between Microcystis and crustacean zooplankton.