Synuraceae (Chrysophyceae) in the Netherlands

Summary

Investigations of phytoplankton biomass development and species succession in the Oude Waal near Nijmegen revealed the importance of the Chrysophyceae (Table I).

Submicroscopical structures of the Chrysophyceae are known to be species-specific. So electronmicroscopical observations have been introduced into the research program. Special attention has been paid to the (scale-bearing) Synuraceae. The analysis of weekly taken samples in the year 1979 revealed a typical temporal distribution pattern of the Synuraceae, mainly controlled by temperature. Particulary the genusSynura showed a succession of four species:S. uvella dominated at water temperatures from 10–14°C,S. glabra from 14–16°C,S. curtispina from 10–19°C andS. petersenii occurred at water temperatures ranging from 0–21°C.