DIFFERENT ZOOPLANKTON STRUCTURES IN THE GERMAN BIGHT

In August 1982, a net of 48 stations with altogether 208 samples was i nvestigated in the eastern German Bight with respect to temperature, s alinity, as well as the amount and species composition of the mesozoop lankton (> 80 mum). The data were arranged into different structures b y means of a cluster analysis. Four different clusters were found: (a) a ''Wadden Sea water'' with few holoplankton organisms but a higher a mount of spionid larvae; (b) a ''German Bight water'' with a maximum o ccurrence of turbellaria (Alaurina composita) and medium concentration s of copepods; (c) a mixing area between these two water masses with h ighest amounts of Oikopleura dioica, Temora longicornis, Acartia sp., mussel larvae and larvae of the spionid worms; (d) a ''North Sea water '' mass with highest concentrations of Pseudocalanus elongatus, Paraca lanus parvus und Oithona similis. The differences in the concentration s of the species mentioned between the four clusters were significant on the 0.1%-level.