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Calculations of results in grazing experiments using the counting method
Tackx, M.L.M.; Van de Vrie, E.M. (1986). Calculations of results in grazing experiments using the counting method, in: (1986). IZWO Coll. Rep. 16(1986). IZWO Collected Reprints, 16: pp. chapter 11 [Subsequent publication]
In: (1986). IZWO Coll. Rep. 16(1986). IZWO Collected Reprints, 16[s.n.][s.l.], more
In: IZWO Collected Reprints. Instituut voor Zeewetenschappelijk Onderzoek: Bredene & Oostende. ISSN 0772-1250, more

Also published as
  • Tackx, M.L.M.; Van de Vrie, E.M. (1985). Calculations of results in grazing experiments using the counting method. Hydrobiol. Bull. 19(1): 29-36, more

Keywords
    Food intake; Food intake; Grazing; Ingestion; Mathematical analysis; Measuring devices; Phytoplankton; Zooplankton; Marine

Authors  Top 
  • Tackx, M.L.M., more
  • Van de Vrie, E.M.

Abstract
    Different formulae used in the literature for calculation of ingestion rates are reviewed. Their applicability is discussed in relation to two criteria: the occurrence of saturation of the feeding and/or growth of the food particles. It is shown by simulations that the differences in results obtained by calculating ingestion following a linear or an exponential model are restricted to a few percent. Calculation of ingestion rates by substantial over- or underestimation depending on the growth constant of the food particles and the grazing time.
    The formula I = Vk(CztCzoekt)/
    N(I-ekt) is proposed for the calculation of ingestion rates under saturated circumstances.
    It is demonstrated that, with data obtained by multi-size class analysis, calculations on total particle concentrations are only feasible when growth constants and grazing coefficients are equal for all size classes considered.
    Attention is drawn to calculation problems resulting from non-normally distributed results and from non equal particle concentrations in control and grazing bottles at the beginning of the experiment. For the latter problem, two correction methods are proposed.

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