The reproducibility of tank experiments concerning unicellular marine algal development was analyzed by means of parallel experiments with cultures of Thalassiosira rotula and Skeletonerna costatum, using large flexible plastic tanks under semi-natural condi-

A new enriched sea water medium has been developed in order to make culture experiments of ecological relevance with neritic and oceanic phytoplankton species. In batch cultures, final cell yields of both neritic and oceanic diatoms and dinoflagellates correspond more or less to maximum cell densities of their natural populations. First results with unialgal and bialgal batch culture experiments are provided.

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Studies on the Motion of the Sea as an Ecological Factor for Plankton Organisms with Special Regard to Marine Diatoms

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