Zur Lebensgeschichte dominanter Copepodenarten (Calanus finmarchicus, C. glacialis, C. hyperboreus, Metridia longa) in der Framstrasse = On the life history of dominant copepod species (Calanus finmarchicus, C. glacialis, C. hyperboreus, Metridia longa) in the Fram Strait - Diel, Sabine (Berichte zur Polarforschung ;, 1991)