Abstract
A major problem in paleo-ecological research of diatoms in tidal environments is the distinction of
autochthonous and allochthonous diatom valves. A new approach applying several diatom- and non-diatomrelated
criteria is introduced in order to solve the autochthonous/allochthonous problem. A classification of
coastal diatoms in ecological groups, and the relation between these ecological groups
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