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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 6 | PAGES 723-733 | 1997
© Oxford University Press

research-article

UVC-induced lysis and detritus production of Oscillatoria limnetica in a two-stage continuous-flow system

Erik J. van Hannen and Herman J. Gons

Netherlands Institute of Ecology, Centre for Limnology Rijksstraatweg 6, 3631AC Nieuwersluis The Netherlands

Received on December 3, 1996; accepted on February 13, 1997 In order to study in model systems the role of heterotrophic micro-organisms in the aquatic microbial food web, a natural food source consisting of senescent primary producer cells is indispensable. A two-stage continuous-flow system with the ability to produce detritus continuously is presented. In the first stage, a primary producer, i.e. the cyanobacterium Oscillatoria limnetica, was cultured. The second stage was fed with UVC-killed primary producer cells from the first stage. A control second stage received living primary producer cells. Both second stages were filled with prefitered lake water in order to provide a natural inoculum of bacteria. During a 2 month experiment, the system was tested for its ability to produce detritus (first stage of detritus, i.e. lysis of the cell material). Chlorophyll a concentrations proved to be adequate for calculating specific lysis rates. Very high specific lysis rates were found after killing the cells with UVC as compared to the control stage.


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E. J. van Hannen, W. Mooij, M. P. van Agterveld, H. J. Gons, and H. J. Laanbroek
Detritus-Dependent Development of the Microbial Community in an Experimental System: Qualitative Analysis by Denaturing Gradient Gel Electrophoresis
Appl. Envir. Microbiol., June 1, 1999; 65(6): 2478 - 2484.
[Abstract] [Full Text]


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