Abstract
Rank distribution parameters for the abundance of phytoplankton species was calculated based on long-term hydrobiological monitoring (1978-1997) of water bodies in the Azov, Caspian, and Kara hydrographic regions. Two model relationships between species abundance and the rank were used in data analysis: exponential and hyperbolic. Parameter variability related to changes in environmental quality in time and space was analyzed. The dependencies of parameters on the region, time, and season of sampling were determined. Possible factors underlying the parameter dependence on phytoplankton sample processing in the system of biological monitoring were analyzed.
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