The Role of Planktonic Organisms in Urea Metabolism in Lakes of Temperate Zone : Case Study

• Autorzy: Siuda W. , Chróst R. J. , Kalinowska K. , Ejsmont-Karabin J. , Kiersztyn B.

Identyfikatory

DOI

10.3161/15052249PJE2016.64.4.003

• Języki publikacji: EN

Abstrakty

EN

Although urea is the simplest N-containing organic compound ubiquitous in all aquatic environments, its role in N-nutrition of planktonic biota and relevance for eutrophication of freshwater ecosystems is still insufficiently defined and often bypassed. The dynamics of production of autochthonous urea as well as maximal potential net ureolytic activity (net URA V_max) of phyto- and bacterioplakton were studied in mesocosm experiment and verified during the field studies conducted in the Great Mazurian Lake system (GMLS). Analysis of the obtained results revealed that the proteins were the main autochthonous urea precursors. Urea concentration in the studied mesocosms and in GMLS surface waters was positively correlated with flagellate, ciliate and crustacean biomass and, less evidently, with bacterial biomass (BB). In surface waters of GMLS net URA V_max, similarly as urea concentrations, increased with their trophic status. Analysis of correlation of potential ureolytic activity with chlorophyll_a, (Chl_a) BB and L-leucine aminopeptidase activity (AMP) in lakes of different trophic status suggests that although both groups of planktonic microorganisms participated in urea decomposition processes, in eutrophic ones bacterial decomposition of urea is more evident. In highly eutrophic lakes excess of phosphorus induced higher nitrogen requirement resulting in the increase in protein decomposition rate. Intensified protein degradation resulted faster urea production, which finally induced higher ureolytic activity of planktonic microorganisms. In profundal waters of GMLS potential ureolytic activity was distinctly lower than in surface waters. This was caused by low temperature of hypolymnetic waters, inhibitory effect of hydrogen sulphide and lack of phytoplankton, which is known as a primary urea consumer.

Słowa kluczowe

EN

Great Mazurian Lake system; autochthonous urea production; urea precursors; ureolytic activity; mesocosms; lakes of temperate zone; planktonic microorganisms

PL

Wielkie Jeziora Mazurskie; produkcja mocznika; prekursorzy mocznika; aktywność ureolityczna; jezioro strefy umiarkowanej; mikroorganizmy planktonowe

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2016
• Tom: Vol. 64, nr 4
• Strony: 468--484
• Opis fizyczny: Bibliogr. 63 poz., mapa, tab., wykr.

Twórcy

autor

Siuda W.

• Department of Microbial Ecology and Environmental Biotechnology, Institute of Botany, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw
• University of Warsaw, Biological and Chemical Research Centre, Żwirki i Wigury 101, 02-089 Warsaw, Poland

autor

Chróst R. J.

• Department of Microbial Ecology and Environmental Biotechnology, Institute of Botany, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw
• University of Warsaw, Biological and Chemical Research Centre, Żwirki i Wigury 101, 02-089 Warsaw, Poland

autor

Kalinowska K.

• Department of Lake Fisheries, Inland Fisheries Institute in Olsztyn, Rajska 2, 11–500 Giżycko, Poland

autor

Ejsmont-Karabin J.

• Nencki Institute of Experimental Biology, 3 Pasteur Street, 02–093 Warsaw, Poland

autor

Kiersztyn B.

• Department of Microbial Ecology and Environmental Biotechnology, Institute of Botany, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw
• University of Warsaw, Biological and Chemical Research Centre, Żwirki i Wigury 101, 02-089 Warsaw, Poland

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.