Title: Aspects of developmental and mortality rates in Calanus finmarchicus related to equiproportional development
Abstract: The marine copepod Calanus finmarchicus from coastal areas of northern Norway was cultivated a t 3 temperatures from e g g to adult in the laboratory.Growth and survival of copepodite stages were markedly affected by the temperature regime.If populations of copepodite Stage I experience a sharp decrease in temperature, mortality rate is increased.On this basis the hypothesis is formulated that during the main annual growth penod of C. finn~archicus in arctic-boreal areas not only is this specles sensihve to a temperature decrease, but also a certain temperature increase IS a prerequisite to successful growth from copepodite Stage I to copepodite Stage IV and V.The ecological implications of this hypothesis are discussed.Temperature-dependent mortality rates in certain growth periods of C. finmarchrcus are also related to the postulated rule of equiproportional development in marine copepods.