Feeding, growth, and reproduction in the genus Calanus

A combination of shipboard and laboratory experimentation and mesocosm rear ing is used in an integrated study of feeding, gros th, and reproduction of Calanus finmarchicus. Comparisons are made where possible with the co-occu rring Calanus helgolandicus. Regional and seasonal variability of feeding a nd reproduction was investigated for C. finmarchicus in the open Norwegian Sea and for C. helgolandicus at a coastal station in the English Channel. M esocosm experiments, carried out in western and northern Norway to identify environmental cues governing the life-cycle pattern, art: compared with th e results of laboratory studies of nutrition, growth, and reproduction unde r controlled conditions. The results are discussed in relation to physiolog ical and life-cycle models of Calanus. (C) 2000 International Council for t he Exploration of the Sea.