Abstract
The dataset on benthic fauna diversity obtained by ecological monitoring of lakes (Mari El Republic) was analyzed for applicability in water quality biological benchmark. The effect of several parameters on biodiversity were tested: (1) calculation errors in species number definition, (2) application of certain evaluation method of rank distribution parameters, (3) adequacy degree of distribution model, (4) evenness: diversity ratio, (5) hydrochemical parameters of lake, and (6) “sampling site effect” (natural reserve area impact). The biodiversity characteristics were suggested, which highly correlated to obtained data. The critical level for each characteristic was proposed to define favorable and adverse conditions of benthic communities. Practical recommendations were given for using studied parameters in the evaluation of the water quality biological benchmark in Mari El Republic.
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