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During 1990/91 four surveys were made in the tidal channel of the Lower Weser Estuary and in the adjacent tidal harbours to describe typical low discharge spring/summer situations. The results show that at least for the zooplankton component and partly for the phytoplankton, the tidal harbours partly compensate for the loss of natural side arms, which have been destroyed due to channelization of...
The concept of Gosta Jagersten of a primary biphasic metazoan life-cycle, consisting of a planktotrophic larva and a benthic adult, forms the basis for several theories on metazoan phylogeny. In this paper the assumed planktotrophic life-style of the larva is critically analyzed and reconsidered. It is shown, in particular for the Mollusca, that a biphasic life-cycle with a lecithotrophic larva...
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