Neustonic versus planktonic bacteria in eutrophic lake

• Autorzy: Kalwasińska A. , Donderski W.
• 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).

Słowa kluczowe

EN

bacterial production; bacterioneuston; bacterioplankton; physiological properties; surface microlayer

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2005
• Tom: Vol. 53, nr 4
• Strony: 571--577
• Opis fizyczny: Bibliogr. 27 poz., rys., tab.

Twórcy

autor

Kalwasińska A.

• Department of Water Microbiology and Biotechnology, Nicolaus Copernicus University, Gagarina 9, 87 – 100 Toruń, Poland

autor

Donderski W.

• Department of Water Microbiology and Biotechnology, Nicolaus Copernicus University, Gagarina 9, 87 – 100 Toruń, Poland

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