For instance, snails are the most vulnerable group for crayfish predation, yet show anti-predator behaviour and could avoid predators by moving up to Phragmites stems (Nystr€om & Perez, 1998; Turner et al., 2000).
Forinstance, snails are the most vulnerable group for crayfishpredation, yet show anti-predator behaviour andcould avoid predators by moving up to Phragmites stems(Nystr€om & Perez, 1998; Turner et al., 2000).