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JOURNAL OF PLANKTON RESEARCH | VOLUME 13 | NUMBER 1 | PAGES 247-262 | 1991
© Oxford University Press

research-article

Pseudobalanion planctonicum (Ciliophora, Prostomatida): ecological significance of an algivorous nanociliate in a deep meso-eutrophic lake

Helga Müller

Limnological Institute, University of Konstanz PO Box 5560, D-7750 Konstanz, FRG

Received on April 2, 1990; accepted on October 4, 1990 Pseudobalanion plancioracum was the most abundant ciliate species in the pelagic zone of Lake Constance, FRG, over a 3 year period. Annual averages accounted for 30, 35 and 43% of total ciliate numbers in the uppermost 20 m of the water column in 1987, 1988 and 1989 respectively. Highest cell numbers were observed in early spring, simultaneously with the first phytoplankton maximum. The small ciliate (mean length 15 µm, mean cell volume 1300 µm3) is a raptorial feeder and predominantly consumes phytoplankton. In laboratory cultures, P planctonicum grew well on a diet of Rhodomonas sp. (Cryptophyceae). Maximum growth rates increased from 0.46 day–1 at 5 5°C to 1.52 day–1 at 18.5° C, while temperatures above 21°C were lethal. Depending on food concentration, 0.2–4.4 Rhodomonas cells were ingested per ciliate and hour.


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