Résumé
The effect of several biotic and abiotic factors on the fecundity and hatching success of Calanus helgolandicus was tested during short- and long-term incubations. The results show that the variations of the reproductive responses of C.helgolandicus are time dependent and rely on the type of factor tested. When standardized over a 24 h incubation period, estimates ofin situ production and egg viability can be obtained with good accuracy.