Abstract
The plankton time series of ‘Helgoland Roads’ has shown a multiannual population change in the abundance of the turbellarian Alaurina composita Mecznikow 1865. From the 1970s to the mid-1980s, the summer population increased by two orders of magnitude; since then, it has fallen by about one order of magnitude. As limnetic investigations in related species show, A.cornposita must be considered a key predator of the North Sea pelagial. Knowledge regarding the biology and ecology of the species is only rudimentary.
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