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JOURNAL OF PLANKTON RESEARCH | VOLUME 16 | NUMBER 4 | PAGES 391-401 | 1994
© Oxford University Press

research-article

Laboratory and field observations on the scuticociliate Histiobalantium from the pelagic zone of Lake Constance, FRG

Helga M{diaeresis}ller1 and Thomas Weisse1,2

1University of Konstanz, Limnological Institute PO Box 5560, D-78434, Konstanz, FRG

Received on May 25, 1993; accepted on December 4, 1993

Histiobalantium sp. was found regularly in the pelagic zone of Lake Constance, FRG, over five annual cycles. Maxima of up to 6400 cells l–1 were recorded in late summer, with similar numbers in the 0–8 and 8–20 m depth intervals. On an annual average, the population accounted for 10–17% of the total biomass of planktonic ciliates. In the laboratory, Histiobalantium grew well on a diet of the cryptophyte Rhodomonas sp. Maximum growth rates obtained in batch cultures were 0.21 and 0.33 day–11 at 9 and 18°C, respectively. In situ experiments using diffusion chambers yielded positive growth rates in autumn and winter. The highest values recorded at the ambient temperatures 5, 14 and 17°C were 0.17, 0.32 and 0.40 day–1, respectively. Comparing these results with the different seasonal distributions and higher measured growth rates of other ciliates from Lake Constance, we conclude that Histiobalantium is a superior competitor at relatively low algal food concentrations.

2Present address: Fisheries & Oceans Canada, 4160 Marine Drive, West Vancouver, BC, V7V 1N6, Canada


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