Abstract
Daphnia hyalina held in water which previously contained their potential predators Chaoborus flavicans showed a marked dependence in their anti-predator response on both the predator density and the daphnid's age. More animals produced neck teeth in treatments with high Chaoborus densities as compared to lower densities. Neck-teeth production decreased on the other hand with increasing age of the prey. Both parameters are assumed to regulate the neck-teeth response in the laboratory. In the field, predator densities at which the daphnids responded were lower than those found under artificial conditions. A size dependence of this anti-predator response could not be found.
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