Ecological aspects of nitrogen transformation in a mesotrophic lake (Lake Dlugie Wigierskie) in the presence of black cormorants (Phalocrocorax carbo)
2006
Wisniewska, H. | Niewolak, S. | Korzeniewska, E. | Filipkowska, Z.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Environmental Microbiology
The paper comprises results of assays of ammonium, nitrite, nitrate, and organic nitrogen, mineral and total phosphorus, chlorophyll a, temperature, oxygen, pH, Secchi's disc visibility and count of ammonifying, the 1st phase nitrifying (Nitrosomonas) and the 2nd phase nitrifying (Nitrobacter), reducing NO3 to NO2, denitrifying (reducing NO3 to N20/N2) and atmospheric nitrogen fixing bacteria (aerobic and anaerobic) in the waters of Dlugie Wigierskie Lake. The study was completed during 3 successive vegetative seasons in 1999-2001, at sites located in the deepest parts of the lake as well as its inflow and outflow. Microbiological assays were carried out at 10 sites located in some characteristic points (especially near habitats of black cormorants). The amounts of nitrate nitrogen, mineral and total phosphorus and chlorophyll a corresponded to the values characterizing water classified as purity class I. Sporadically the content of ammonium nitrogen reached the values which corresponded to class II of water purity, while the amounts of nitrite nitrogen and oxygen indicated water purity classes II and III. The counts of nitrogen cycle bacteria suggested relatively low eutrophication of the lake. Although on many occasions more bacteria were detected in water samples collected near black cormorant habitats, statistical differences between those and other sites were either non-significant or very small
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