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The relationship between plankton primary production and the geographic latitude suggests the dependence of biological productivity of water bodies on natural climatic conditions. Comparative analysis of the key factors governing phytoplankton productivity in the Volga and Yenisei rivers was made to reveal this relationship; these rivers represent two large river systems which extend in meridional direction, pass through various natural climatic zones, and differ in aquatic life habitats.
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Минеева et al. (2014) studied this question.
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