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1 Polish Journal of Ecology

1 2002

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The relative contributions by phytoplankton and macrophytes to primary production of two shallow lakes (Karelian Isthmus, Russia)

Trifonova I., Denisova I., Stanislavskaia E., Aphanasieva A., Ulianova D.

Polish Journal of Ecology

2002

Vol. 50, nr 3

357-370

Biomass and productivity of the main autotrophic communities, and their contribution to total lake primary production, were studied in two shallow, polymictic lakes of the Karelian Isthmus (north-west Russia). Both lakes are highly productive but with contrasting contributions from macrophytes and algae. In Lake Rakovoe, with very large catchment and high external P loading, macrophytes are estimated to occupy 60% of its area and produce 106 g C m^-2 or 63% of the lake's annual primary production. In Lake Vishnevskoe with high TP content in lake water, determined by internal loading, phytoplankton is the main producer of organic matter; it produces 178 g C m^-2 or 85% of total annual production. The Conditions which determine different types of primary production composition are discussed.