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Neustonic versus planktonic bacteria in eutrophic lake

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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
This paper presents the results of research on the number, the rate of secondary production and physiological properties of neustonic (surface microlayer SM ≈ 250 μm) and planktonic (subsurface water SSW ≈ 10-15cm) bacteria of the eutrophic lake (TP 30-99 μg l-1; TN 0.94-1.76 mg l-1; chlorophyll a 26.4-56.9 mg l-1; water transparency 1.2-1.9 m). It was found that the total number of neustonic bacteria (TNB) varied from 1.28 × 106 to 1.98 × 106 cells ml-1 and was from 1.4 to 2.0 times higher than the number of planktonic bacteria (P <0.001). TNB range for planktonic bacteria oscillated between 0.75 × 106 and 1.45 × 106 cells ml-1. The number of heterotrophic neustonic (SM) bacteria (CFU 22°C) was also higher by 2.0 to 13.3 times (P <0.001) being between 1.48 and 12.5 × 103 cells ml-1 while the CFU of bacteria in the SSW oscillated between 0.35 to 0.94 × 103 cells ml-1. Both the values of TNB and CFU displayed a distinct seasonal variation (P <0.001). However, the rate of secondary production of planktonic bacteria was higher (from 1.1 to 6.0 times) than the rate of production of neustonic bacteria (P <0.05) and displayed seasonal variability (P <0.001). The rate of secondary production in subsurface water ranged from 0.676 to 1.265 μgC l-1 h-1 while in surface microlayer from 0.118 to 0.597 μgC l-1 h-1. In neuston the bacteria decomposing fat and DNA were more common than in plankton (P <0.05).
Rocznik
Strony
571--577
Opis fizyczny
Bibliogr. 27 poz., rys., tab.
Twórcy
  • Department of Water Microbiology and Biotechnology, Nicolaus Copernicus University, Gagarina 9, 87 – 100 Toruń, Poland
autor
  • Department of Water Microbiology and Biotechnology, Nicolaus Copernicus University, Gagarina 9, 87 – 100 Toruń, Poland
Bibliografia
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  • 6. Donderski W., Strzelczyk E. 1992 – The ecology and physiology of aerobic heterotrophic bacteria in lakes of diferent trophy. (In: Some Ecological Processes of the Biological Systems in North Poland. Eds: Bohr R., Nienartowicz A., Wilkoń – Michalska J.,) – N. Copernicus University Press, Toruń.
  • 7. Donderski W., Walczak M., Mudryk Z. 1998 – Neustonic bacteria of Lake Jeziorak Mały (Poland) – Polish Journal of Environ. Stud., 7: 125–129.
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BGPK-1139-4664
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