Abstract
Numbers of heterotrophic bacteria (plate counts on beef-peptone agar), direct counts and the biovolume of bacteria were investigated. In addition, chlorophyll a and kjeldahl nitrogen concentrations were determined in epilithon.
Bacteria attached in epilithon predominated in all localities, forming in very shallow (0.1–0.3 m) or polluted localities more than 95% of the bacterial population.
Differences in bacterial densities in epilithon indicated the input of organic pollution more distinctly than suspended bacteria since the former are dependent on the available organic substrates. This relation was especially true regarding the numbers of epilithic heterotrophic bacteria which ranged from 102 cm−2 in unpolluted mountain streams to 109 cm−2 in a heavily polluted river. Suspended heterotrophic bacteria in these localities ranged from 10 to 105 ml−1 indicating level bacterial pollution. The total cell counts in epilithon of the same localities ranged between 108–1010 cm−2 and in water between 105–107 ml−1.
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Punčochář, P. (1983). Attached and suspended bacterial populations in shallow running waters under different levels of pollution. In: Wetzel, R.G. (eds) Periphyton of Freshwater Ecosystems. Developments in Hydrobiology, vol 17. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7293-3_42
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DOI: https://doi.org/10.1007/978-94-009-7293-3_42
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