Neck-teeth induction in Daphnia hyalina under natural and laboratory conditions
Archiv für Hydrobiologie Volume 140 Number 3 (1997), p. 367 - 372
published: Nov 10, 1997
ArtNo. ESP141014003001, Price: 29.00 €
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.