Abstract
The seasonal distribution of benthic species in the water column above and below the thermocline in a small eutrophic lake is described. During summer stratification populations of Spirostomum spp, Loxodes spp., Plagiopyla and Deltopylum become established in the plankton on or below the oxycline/thermocline. At shallow sites no migration occurred and populations of the migratory species in the benthos were sparse, with the exception of Plagiopyla which occurred in high densities in the sediment. Two distinct planktonic populations are established during stratification: an epilimnetic community of obligate planktonic ciliates and a hypolimnetic community of benthic migrants.
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Bark, A. W., 1981. The temporal and spatial distribution of planktonic and benthic protozoan communities in a small productive lake. Hydrobiologia 85: 239–255.
Beaver, J. R. & T. L. Crisman, 1982. The trophic response of ciliated protozoans in freshwater lakes. Limnol. Oceanogr. 27: 246–253.
Beaver, J. R., T. L. Crisman & R. W. Bienert, 1988. Distribution of planktonic ciliates in highly coloured subtropical lakes; comparison with clearwater ciliate communities and contribution of myxotrophic taxa to total autotrophic biomass. Freshwat. Biol. 20: 51–60.
Finlay, B. J., J. Laybourn & I. Strachan, 1979. A technique for the enumeration of benthic ciliated protozoa. Oecologia (Berl.) 39: 375–377.
Finlay, B. J., 1981. Oxygen availability and seasonal migrations of ciliated protozoa in a freshwater lake. J. gen. Microbiol. 123: 173–178.
Finlay, B. J., 1985. Nitrate respiration by protozoa (Loxodes spp.) in the hypolimnetic nitrate maximum of a productive freshwater pond. Freshwat. Biol. 15: 333–346.
Finlay, B. J., T. Fenchel & S. Gardiner, 1986. Oxygen perception and oxygen toxicity in the freshwater ciliated protozoon Loxodes. J. Protozool. 33: 157–165.
Gates, M. A., 1984. Quantitative importance of ciliates in the planktonic biomass of lake ecosystems. Hydrobiologia 108: 233–238.
Gates, M. A. & U. T. Lewg, 1984. Contribution of ciliated protozoa to the planktonic biomass in a series of Ontario lakes: quantitative estimates and dynamical relationships. J. Plankton Res. 6: 443–456.
Goulder, R., 1972. The vertical distribution of some ciliated protozoa in the plankton of a eutrophic pond during summer stratification. Freshwat. Biol. 2: 163–176.
Goulder, R., 1974. The seasonal and spatial distribution of some benthic ciliated protozoa in Esthwaite Water. Freshwat. Biol. 4: 127–147.
Goulder, R., 1975. The effects of photosynthetically raised pH and light on some ciliated protozoa in a eutrophic pond. Freshwat. Biol. 5: 127–147.
Hecky, R. E. & H. T. Kling, 1981. The phytoplankton and protozooplankton of the euphotic zone of Lake Tanganyika: species composition, biomass, chlorophyll content and spatio-temporal distributions. Limnol. Oceanogr. 26: 548–564.
Jones, J. G., 1978. The distribution of some freshwater planktonic bacteria in two stratified eutrophic lakes. Freshwat. Biol. 8: 127–140.
Lauterborn, R., 1901. Die ‘Sapropelische’ Lebewelt. Zool. Anz. 24: 50–55.
Laybourn, J. & B. J. Finlay, 1976. Respiratory energy losses related to cell weight in ciliated protozoa. Oecologia (Berl.) 24: 329–355.
Laybourn-Parry, J., J. Olver, A. Rogerson & P. L. Duvergé, 1990. The temporal and spatial patterns of protozooplankton abundance in a eutrophic temperate lake. Hydrobiologia 203: 99–110.
Lewis, W. M., 1985. Protozoan abundances in the plankton of two tropical lakes. Arch. Hydrobiol. 104: 337–343.
Mamaeva, N. V., 1976. Planktonic ciliates in the Ivan'kovsky water reservoir. Zool. Zhur. Ukra. 55: 657–664.
Pomeroy, L. R., 1974. The ocean's food web: a changing paradigm. Bioscience 24: 499–504.
Schlott-Idl, K., 1984. Die raumliche und zeitliche Verteilung der pelagischen Ciliaten im Lunzer Untersee 1981/82. Arch. Hydrobiol. 101: 279–287.
Ramsbottom, A. E., 1976. Depth charts of the Cumbrian lakes. Freshwater Biological Association Publication No. 33.
Taylor, W. D., 1984. Phosphorus flux through epilimnetic zooplankton from Lake Ontario: relationship with body size and significance to phytoplankton. Can. J. Fish. aquat. Sci. 41: 1702–1712.
Taylor, W. D. & M. L. Heynen, 1987. Seasonal and vertical distribution of Ciliophora in Lake Ontario. Can. J. Fish. aquat. Sci. 44: 2185–2191.
Tinson, S & J. Laybourn-Parry, 1986. The distribution and abundance of benthic cyclopoid copepods in Esthwaite Water, Cumbria. Hydrobiologia 131: 225–234.
Webb, M. G., 1961. The effects of thermal stratification on the distribution of benthic protozoa in Esthwaite Water. J. Anim. Ecol. 30: 137–151.
Williams, P. J. LeB, 1981. Incorporation of microheterotrophic processes into the classical paradigm of the planktonic foodweb. Kieler Meerses-forsch. Sonderh. 5: 1–28.
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Laybourn-Parry, J., Olver, J. & Rees, S. The hypolimnetic protozoan plankton of a eutrophic lake. Hydrobiologia 203, 111–119 (1990). https://doi.org/10.1007/BF00005619
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DOI: https://doi.org/10.1007/BF00005619