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1 Polish Journal of Ecology

1 2006

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Chitinolytic bacteria in two lakes of different trophic status

Swiontek-Brzezinska Maria, Donderski Wojciech

Polish Journal of Ecology

2006

Vol. 54, nr 2

295-301

This paper presents the results of research on the number of chitinolytic bacteria and chitinolytic activity of strains in the oligo-mesotrophic and the eutrophic lakes. Two lakes of soft and hard water and of different trophic status (in terms of nutrients contents) from Iławskie Lake District (North Poland) were choosen. The numbers of chitinolytic bacteria were higher in eutrophic lake (average 1.0 x 10^3 cells cm^-3) than in oligo-mesotrophic lake (average 0.5 x 10^3 cells cm^-3) as well as in littoral versus pelagic zone. However, a higher percentage of chitinolytic bacteria (average 13%) among the total numbers of heterotrophic bacteria was found in oligo-mesotrophic lake as well as higher rate of the chitinolytic activity of bacteria (7.0 versus 4.5 nmol GlcNAc mg^-1 protein h^-1 after 6 days of incubation). The possible shortage of dissolved organic compounds in mesotrophic lake was pointed up as the reason for using the dissolved chitin as the source of carbon and nitrogen. Enterobacter aerogenes (28%), Aeromonas sp. (25%) and Chromobacterium sp. (16%) dominated in oligo-mesotrophic lake. In eutrophic lake, the most numerous species were Aeromonas hydrophila (46%) and Aeromonas sp. (15%).