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Calculations of results in grazing experiments using the counting method
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
In: Hydrobiological Bulletin. Netherlands Hydrobiological Society: Amsterdam. ISSN 0165-1404; e-ISSN 2214-708X, more
Peer reviewed article  

Available in  Authors 
    VLIZ: Open Repository 129120 [ OMA ]

    Analysis > Mathematical analysis
    Aquatic communities > Plankton > Phytoplankton
    Aquatic communities > Plankton > Zooplankton
    Behaviour > Feeding behaviour > Grazing
    Equipment > Measuring devices
    Food intake
    Ingestion > Intake > Food intake > Ingestion > Intake > Food intake > Ingestion > Intake > Food intake

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

    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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