Abstract
Metarhombognathus armatus, a phytophagous mite widespread in the North Atlantic, is abundant on marine and estuarine rocky shores. Examinations in the Weser estuary have shown that more than 90% of the individuals can be found in the vicinity of mean high water (MHW). Absence of this species in the lower eulittoral and in the supralittoral can probably be attributed to absence of the green alga Blidingia sp. in these littoral zones. Fucus vesiculosus, a large brown alga, predominates the lower eulittoral and overgrows the rocky substrate homogeneously. In laboratory studies it has been pointed out that various kinds of food have a significant influence on certain biological parameters; for example, M. armatus cannot complete its life cycle when fed with the brown alga F. vesiculosus or with certain species of green algae (e.g. Enteromorpha spp., Prasiola stipitata).
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