Zur Vertikalwanderung planktischer Copepoden im Bodenseee-Obersee

In completion of long-term investigations on the annual cycles of planktonic crustaceans in Lake Constance a number of day-night samples were taken. The results are presented in regard to the amplitudes of vertical movements for some copepods, especially the different instars. The numbers in the net hauls show a coarse but clear picture of these migrations. The role of diurnal vertical migration for the release of diapause inCyclops vicinus is discussed.