Abstract

From April to October 1986 the occurrence of autotrophic, mainly naked nanoflagellates was surveyed qualitatively and semi-quantitatively at four stations in Kiel Bight and Kiel Fjord by use of the Dilution Culture technique and light-microscopy of live preparations. In April, the flagellate community was characterized by species mostly >10μm ( Cryptomonas pseudobaltica, Katodinium rotundatum, Pseudopedinella pyriforme, Heterosigma akashiwo). After a bloom of Dictyocha speculum in May, mainly smaller species occurred during summer ( Dicrateria/Imantonia sp., Nephroselmis pyriformis, Ochromonas minima and others). From late August onwards Prorocentrum minimum occurred and formed a ‘red tide’ in Kiel Fjord. Based on their seasonal occurrence, temperature ranges are discussed for each species.

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