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- W952586246 abstract "The influence of turbulence (turbulent kinetic energy dissipation) on predator-prey interactions in zooplankton is discussed with respect to the combined effect of the choice of the turbulent length scale, and size and velocity of predator and prey concentration on the encounter rate. The significance of correct scaling to the turbulent encounter velocity is demonstrated, with three different definitions being considered: the average prey separation, the Kolmogorov scale, and the predator’s reactive distance. Numerical investigations using these different definitions of scale were carried out to find the convergence conditions and the behaviour of the scale values for 5-10 mm fish larvae which feed off copepod nauplii in the 104-105 m-3 concentration range. The choice of the turbulent length scale is not important for small predator body sizes 10 mm and prey concentrations <106 m-3, the scale can be defined as the average prey separation or as the predator’s reactive distance. The effect of turbulence on the encounter rate decreases with the increasing size and velocity of the predator and with prey concentration. A simple one-dimensional prey-predator ecosystem model in the upper mixed layer is presented, which examines the relative importance of turbulence to growth in planktonic consumers. This effect is less for low prey densities <104 m-3, when the initial predator biomass and constant growth rate term have a decisive influence. However, the effect of turbulence on the characteristics investigated increases with rising prey density, in which case the controlling factor is encounter rate and in the case of prey concentration, diurnal migration." @default.
- W952586246 created "2016-06-24" @default.
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- W952586246 date "2006-01-01" @default.
- W952586246 modified "2023-10-02" @default.
- W952586246 title "Encounter rates in zooplankton" @default.
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