Dynamics of lake herring (Coregonus artedi) reactive volume for different crustacean zooplankton

    loading  Checking for direct PDF access through Ovid


Lake herring (Coregonus artedi) can drastically alter the zooplankton community of a lake through size-selective predation. I studied the first step in the predation sequence, reaction to prey, for different zooplankton taxa by lake herring. Reactive distance was significantly shorter for smaller zooplankton taxa (p < 0.0001). Reactive volume was calculated from measured distances and angles of elevation and bearing. This volume augments the reactive distance data and showed a three dimensional geometry, roughly analogous to a deflated basketball, that is amenable to a cruising style of planktivory. Reactive volume is dynamic with respect to variations in prey size (p < 0.001). Reactive volume is a refined measure of a ‘reaction' by fish to a prey item than are simple, linear distances or other, assumed shapes. Thus, for a cruising planktivore, three dimensions need to be considered.

Related Topics

    loading  Loading Related Articles