This paper describes the macroflora and macrofauna associated with two bull kelp species, Laminaria hyperborea and L. digitata, at the island of Helgoland, North Sea. During a study period of seven months (March-September 1987), 29 macroflora species and 125 macrofauna species were found. The dominant taxonomic groups were Polychaeta (25 species), Bryozoa (17), Amphipoda (14), Hydrozoa (10) and Ascidiae (8). The species maximum was in July. In general, L.hyperborea was preferred as a substrate for settlement to L. digitata. Compositio n of the communities associated with kelp changed.during the season accordim:j to exposure to wave action, and according to location on the kelp thallus. The rhizoid community of both kelps bore more species at exposed locations. Wave-exposed L. digitata lacked obvious faunal settlement on both phylloid and cauloid. Phylloid and cauloid of L. hyperborea were chosen as an attractive substrate at both sheltered and wave-exposed locations, showing an association of encrusting bryozoan and hydrozoan colonies.
Die Insekten gehen in den Landschaften Mitteleuropas drastisch zurück – diese Erkenntnis ist in unserer Gesellschaft angekommen. Wie aber sieht die Daten‐ und Faktenlage dazu aus? Welche Auswirkungen wird diese besorgniserregende Entwicklung haben? Welche Notwendigkeiten und Möglichkeiten des Handelns ergeben sich daraus? Antworten auf diese und viele weitere Fragen sowie einen Einblick in die Vielfalt der Insekten und ihrer Lebensweisen gibt die Schwerpunktausgabe 6/7‐2019 der Fachzeitschrift „Natur und Landschaft“ (Abbildung 1).
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