Vol. 18, issue 10, article # 14

pdf Aponasenko A. D., Shchur L. A., Postnikova P. V., Filimonov V. S., Lopatin V. N. Role of organomineral detritus in the microbial trophic web. // Atmospheric and oceanic optics. 2005. V. 18. No. 10. P. 841-846.
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The results of investigation of the effect of the mineral suspended matter forming the organomineral detritus due to the organic matter adsorption from the dissolved phase, on productivity characteristics of the plankton entering into the trophic bonds of a microbial web, are presented. It has been found under laboratory conditions that the increase of the phytoplankton chlorophyll concentration (Сch) in samples with adding of suspension runs more intensively and for a longer time period as compared to the control. In the controls, the Сch increase proceeds up to 67 days with a subsequent reaching of a stationary level at a maximum of 220 μg/l. In samples with adding of 100 mg/l suspension, the stationary level has not been achieved up to 80 days of the experiment. The maximum of the chlorophyll concentration equaled to 520 μg/l. In field conditions, it was shown that all parameters connected with the bacterioplankton productivity characteristics and the content of organic matter adsorbed on mineral suspension, considerably influence the productivity characteristics of the phytoplankton. A multiplicative model of the dependence of primary production on the major environmental factors is offered: the phytoplankton chlorophyll content, a specific coefficient of light absorption by the dissolved organic matter, the adsorbed organic matter content, the bacterioplankton production and destruction, the mean size of phytoplankton cells. It follows from the model that at doubling the bacterioplankton productivity (other parameters being constant) the primary production in lake Khanka increases 2.5 times, in the Yenisei -1.9 times, and in the Krasnoyarsk water reservoir -1.4 times.