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A simplified 14C method for grazing measurements on natural planktonic populations
Daro, M.H. (1978). A simplified 14C method for grazing measurements on natural planktonic populations. Helgol. Wiss. Meeresunters. 31: 241-248
In: Helgoländer Wissenschaftliche Meeresuntersuchungen. Biologische Anstalt Helgoland: Hamburg. ISSN 0017-9957, more
Peer reviewed article

Also published as
  • Daro, M.H. (1978). A simplified 14C method for grazing measurements on natural planktonic populations, in: (1978). IZWO Coll. Rep. 8(1978). IZWO Collected Reprints, 8: pp. chapter 12, more

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Keywords
    Marine; Brackish water; Fresh water

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Abstract
    The method used consists of adding highly radioactive material (40 µCi/l NaH14CO3) to sea water with its natural concentrations of zoo- and phytoplankton, incubating this water in the light, separating zoo- from phytoplankton after 1h or at the most 2h and measuring the radioactivity of both. Under such conditions, the concentration of the tracer in phytoplankton can be simplified as a linear function of time, and that of the zooplankton as a parabolic function of time. This simplification leads to an overestimation of grazing of at most 2-3%. Comparisons with the Coulter Counter method are given and discussed.

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