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JOURNAL OF PLANKTON RESEARCH | VOLUME 13 | NUMBER 2 | PAGES 363-372 | 1991
© Oxford University Press

research-article

A comparison of estimates of productivity and consumption by zooplankton for planktonic ciliates in Lake Ontario

William D. Taylor and Ora E. Johannsson1

1Department of Fisheries and Oceans, Canada Centre for Inland Waters PO Box 5050, Burlington, Ontario, Canada, L7R 4A6 Department of Biology, University of Waterloo Waterloo, Ontario, N2L 3G1

Received on December 19, 1989; accepted on October 22, 1990 A multiple regression equation predicting growth rate for ciliates from cell size and temperature was combined with measurements of biomass to estimate the productivity of ciliates in the epilimnion of Lake Ontario. This method predicts daily production to biomass values for ciliates of up to 5 day–1 and leads to the conclusion that ciliate production could equal half of the carbon fixation by phototrophs. Consumption of ciliates by metazoan zooplankton was estimated by incubating samples passed through 44 µm screens, and determining the increase in abundance of ciliates over 24 h. These rates are much lower, >1 day–1 and often near zero. Production estimates based on these latter rates would be ~3–4% of primary production Possible explanations for this discrepancy include both predation within the microzooplankton community and food limitation, as well as bottle effects However, the lower production estimates are still compatible with ciliates playing a major role as grazers in this ecosystem


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