Summary
The distribution of fresh-water protozoan species on an artificial uniform substrate was studied in plastic troughs with continuous flow of unfiltered lake water. Ten areas were sampled at the same time in each trough and the diversity of species per area determined. Estimates were made of the density as well, but since some species were too delicate to preserve without destroying certain taxonomic characters the primary emphasis was placed on the diversity of species. No patterns were evident which suggested anything other than a random distribution of both species and individuals within each system. The situation appears conceptually similar to that originally pointed out by G. Evelyn Hutchinson in ‘The Paradox of the Plankton’ in which he notes the difficulty of applying the niche concept to the multi-specific association of autotrophic phytoplankton in the freely circulating upper waters of lakes and oceans.
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References
Cairns, John, Jr., - 1965 - The environmental requirements of fresh-water Protozoa. Third Seminar August 13–17, 1962 on Biological Problems in Water Pollution. U. S. Dept. Health, Education, and Welfare, pp 48–52. (Abstract pp 385–386).
Hutchinson, G. E., - 1961 - The paradox of the plankton. Amer. Naturalist, 95 (882): 137–145.
Sramek-Hasek, R., - 1958 - Die Rolle der Ciliaten-analyse bei der biologischen Kontrolle von Flussverunreinigungen. Verh. int. Ver. Limnol., 13: 636–645.
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This work was carried out while the authors were respectively Visiting Lecturer and Teaching Assistant at the University of Michigan Biological Station, Pellston, Michigan.
Department of Zoology University of Kansas
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Cairns, J., Yongue, W.H. The distribution of fresh-water protozoa on a relatively homogeneous substrate. Hydrobiologia 31, 65 (1968). https://doi.org/10.1007/BF00170135
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DOI: https://doi.org/10.1007/BF00170135