Abstract
The abundance and relative importance of autotrophic picoplankton were investigated in two lakes of different trophic status. In the eutrophic lake, measurements of primary production were performed on water samples in situ and in a light incubator three times during the day whereas for the oligotrophic lake, only one measurement of primary production was performed on water samples in the incubator. Dark-carbon losses of phytoplankton from Lake Loosdrecht were investigated in time series. Cell numbers of autotrophic picoplankton in eutrophic Lake Loosdrecht (3.2 × 104 cells ml−1) were lower than in meso-oligotrophic Lake Maarsseveen (9.8 and 11.4 × 104 cells ml−1 at the surface and bottom respectively). In the phytoplankton of both lakes the ratio of picoplankton production increased with decreasing light intensity. In Lake Loosdrecht depth-integrated contribution of picoplankton to total photosynthesis was less than 4%. The P-I-relationship showed diurnal variations in light saturated photosynthesis, while light limited carbon uptake remained constant during the day. Dark carbon losses from short-term labelled phytoplankton during the first 12 hours of the night period accounted for 10–25% of material fixed during the preceeding light period.
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© 1992 Kluwer Academic Publishers
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Schweizer, A., Heusel, R.E. (1992). Picoplankton photosynthesis and diurnal variations in photosynthesis-irradiance relationship in a eutrophic and meso-oligotrophic lake. In: Berman, T., Gons, H.J., Mur, L.R. (eds) The Daily Growth Cycle of Phytoplankton. Developments in Hydrobiology, vol 76. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2805-6_11
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DOI: https://doi.org/10.1007/978-94-011-2805-6_11
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