from one life stage to another (Carpenter et al.,
1992; Post et al., 1997). A fish larva, feeding on
zooplankton, is as distinct ecologically from its
adult form as it is from its planktonic prey.
Piscivores (fish that eat fish), preying on
zooplanktivores (fish that eat zooplankton), can
exert a strong top-down control resulting in a
cascade of effects down the food chain (Fig. 1).
The general mechanism is explained as a decrease
in the predation pressure on zooplankton result