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Hydrobiologia

, Volume 191, Issue 1, pp 15–21 | Cite as

Some characteristics of the community of autotrophs of Lake Sevan in connection with its eutrophication

  • A. S. Parparov
Long-term changes

Abstract

Eutrophication of Lake Sevan caused by the artificial lowering of water level was accompanied by changes in the structure and dynamics of the planktonic communities. A dominance of diatoms up to 1983 was changed to that of green algae in the last years. Primary production of plankton rose and then decreased in the process of eutrophication. The annual average primary production in 1982–1986 — 250 g C m−2 yr−1 — is evidently close to the steady state production under the present morphometry of the lake. The activity coefficient of phytoplanktonic photosynthesis changed within relatively narrow limits, in spite of significant changes in the concentrations of major nutrients and in the structure and productivity of the phytoplankton.

Key words

Lake Sevan water level lowering eutrophication phytoplankton primary productivity 

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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • A. S. Parparov
    • 1
  1. 1.Sevan Hydrobiological Station of the Academy of Sciences of Armenian SSRArm. SSRUSSR

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