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Diel changes in phytoplankton photosynthetic efficiency in Brackish waters

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Abstract

From 18 to 23 September 1974, investigations on the diel changes in phytoplankton were carried out in the Baltic Sea. Every 4 h, water samples were collected from 2 and 15 m, and PO4, chlorophyll a, temperature, salinity, pH, phytoplankton composition and phytoplankton light photosynthesis relationship were determined. Continuous measurements of surface irradiance and some estimations of zooplankton were also made. P B (photosynthesis per unit chlorophyll a at low light levels of 2·10-2 cal cm-2 min-1) revealed only random variation during the sampling period, i.e., 1.0 to 1.6 mg C (mg chlorophyll a)-1 h-1. P B m (Light-saturated photosynthesis per unit of chlorophyll a) displayed pronounced diel fluctuations with the highest value of about 6 mg C (mg chlorophyll a)-1 h-1 around noon, and the lowest value of about 2.5 mg C (mg chlorophyll a)-1 h-1 during the night, during which latter period the value of P B m was more or less constant. Reasons for the diel fluctuations are discussed, and an equation which describes these fluctuations is proposed. Using this equation, the daily phytoplankton production estimated in incubators by a previously described method can be corrected for the time of day at which samples are collected.

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Authors and Affiliations

  1. Water Quality Institute, Høsholm, Denmark

    E. Gargas & I. Hare

  2. Biologische Anstalt Helgoland (Litoralstation), Sylt, Germany (FRG)

    P. Martens

  3. Department of Marine Botany, University of Lund, Lund, Sweden

    L. Edler

Authors
  1. E. Gargas
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  2. I. Hare
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  3. P. Martens
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  4. L. Edler
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Communicated by T.M. Fenchel, Aarhus

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Gargas, E., Hare, I., Martens, P. et al. Diel changes in phytoplankton photosynthetic efficiency in Brackish waters. Marine Biology 52, 113–122 (1979). https://doi.org/10.1007/BF00390418

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