Diel vertical migration of zooplankton

This volume represents the proceedings of the symposium on „Diel Vertical Migration“, held in Lelystad, The Netherlands, in November 1991. The discussions have contributed much to the clarification of the different roles played in our thinking by proximate factors with physiological and evolutionary mechanisms with ultimate causes. The paper gives an overview about the phenomenon of diel vertical migration of pelagic animals in the freshwater and marine environments.