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JOURNAL OF PLANKTON RESEARCH | VOLUME 6 | NUMBER 1 | PAGES 1-14 | 1984
© Oxford University Press

research-article

Sedimentation of principal phytoplankton species in Lake Constance

U. Sommer

University of Constance, Institute of Limnology PO Box 5560, D-7750 Constance, FRG

Received on February 1, 1983; accepted on August 1, 1983 Sedimentation of nine phytoplankton species was studied in Lake Constance with the aid of sedimentation traps exposed at six different depths from 20 to 120 m. The study examines sedimentary fluxes at all depths, temporal variation of sinking velocities into the uppermost trap, annual averages of the sinking velocities at all depths and survival of algae during the sedimentation process. In spite of high intraspecific temporal variability of the sinking velocity there is a clear hierarchy from the pennate and the filamentous centric diatoms sinking the fastest to the Cryptomonads, nearly not at all affected by sedimentary losses. Temporal variability of the sinking velocity within species seems to be related to the ‘physiological state’, the highest velocities always occurring during stationary or decline phases of the population development. An analysis of the role of sedimentary losses in the population dynamics of Asterionella formosa, Fragilaria crotonensis, Stephanodiscus binderaniss, Melosira granulata reveals positive correlations between the sedimentation rate and cell mortality.


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