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Productional Characteristics of Lake Ecosystems
A. F. Alimov
Zoological Institute Russian Academy of Sciences St.-Petersburg, Russia
In order to obtain additional information on the productional characteristics of lake ecosystems, some components of the best-understood biotic balances of lakes of the moderate and arctic zones of the European part of Russia and Byelorussia were analyzed. The following indices were calculated: the production of animal communities, their biomass, the total biomass of an ecosystem (the sum of the biomass of autotrophic and heterotrophic organisms), the production of an ecosystem (the difference between the primary production of an ecosystem and the total losses due to the process of metabolism of all hydrobionts of an ecosystem), and also P/B and K2-coefficients for an ecosystem. The equations descriptive of relationships between the biomass of zooplankton, zoobenthos, bacterioplankton, and heterotrophic organisms, and also between the appropriate P/B coefficients, and the primary production of an ecosystem were derived. It has been found that an ecosystem can not be considered as a simple sum of its components. It is a system with complicated internal relationships characterized by a high efficiency of functioning (Ke = 0.25), and also by a high rate of turnover of its annual biomass close to 1.
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