[Comparative analysis of the energy flows in the ecosystem of a small eutrophic lake during three vegetation seasons (balance model)].
Seasonal energy flows were calculated, based on a simulation balance model, from unique data collected during three vegatation seasons, 1986-1988, in the ecosystem of the Lake Bolshoy Okunyonok, Leningrad province. The model is based on principles developed by G.G. Winberg's school of production hydrobiology and was described in detail in an earlier work (Kazantseva, 2003). Analysis and comparison of the results showed that certain regularities of energy transformation processes in any lake ecosystem are apparent in spite of natural differences determined by differences in the environment properties and the levels of development of the ecosystem components. For instance, the extreme importance of the bacteriadetritus element in the food chains of water-body was confirmed. Broad spectrum of food and considerable changes in food composition during a vegetation season were clearly shown for most hydrobionts. The degree of consumption was estimated for the production of the organisms at each trophic level. It was shown that all the consumers eat away ca. 50-60 per cent of the production of the forage phytoplankton, 90 per cent of the production of non-predatory benthos, and 20-50 per cent of the production of the other trophic groups during a season. The proposed coefficient of energy transformation, CET(s, k) = Ps(k)/Pk, where Ps(k) in the production of the consumer s created by consuming the source k, and Pk is the production of the source itself, proved to be more stable than the generally accepted coefficient q = Ps/Ps -1.
Kazantseva
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D017753:Ecosystem; D004734:Energy Metabolism; D005618:Fresh Water / Q000032:analysis*; D008954:Models, Biological; D012426:Russia; D012621:Seasons