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Recruitment of shore crabsCarcinus maenas on tidal flats: Mussel clumps as an important refuge for juveniles

Helgoländer Meeresuntersuchungen volume 48, pages 321–332 (1994)Cite this article

Abstract

During the late summer and early fall, juvenile shore crabs (Carcinus maenas L.) occurred in high abundances in mussel clumps scattered on tidal flats of the Wadden Sea. Abundances were much lower on bare tidal flats without mussel clumps and decreased substantially from July to November, whereas numbers in mussel clumps remained high. Large crabs left the tidal flats in early fall, whereas juveniles undertook tidal migrations only in the late fall. In March very few shore crabs were found in the intertidal area. The size of juvenile shore crabs living between mussels did not increase significantly during fall. On the bare tidal flats surrounding the mussels, a size increase was observed. Mussel beds and mussel clumps serve as a spatial refuge for the early benthic phases of juvenile shore crabs. Between mussels they can hide effectively from their epibenthic predators. Juvenile shore crabs do not leave the intertidal area and the mussel habitats before their major predators have left the area. Mussel clumps scattered over the tidal flats may be a critical refuge for juvenile shore crabs settling on tidal flats. Intensified efforts in mussel culturing in the European Wadden Sea during recent decades may have caused an increased abundance of mussel clumps on tidal flats, thus enhancing habitat availability for some mussel-clump inhabitants.

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Author notes

  1. M. Thiel

    Present address: Darling Marine Center, University of Maine, ME 04573, Walpole, USA

Authors and Affiliations

  1. Biologische Anstalt Helgoland, Wattenmeerstation Sylt, D-25992, List, Federal Republic of Germany

    M. Thiel & T. Dernedde

  2. Zoologisches Institut, Arbeitsgruppe Marine Ökologie und Systematik, Universität Kiel, Olshausenstr. 40-60, D-24118, Kiel, Federal Republic of Germany

    M. Thiel

  3. Institut für Haustierkunde, Universität Kiel, Olshausenstr. 40-60, D-24118, Kiel, Federal Republic of Germany

    T. Dernedde

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Thiel, M., Dernedde, T. Recruitment of shore crabsCarcinus maenas on tidal flats: Mussel clumps as an important refuge for juveniles. Helgolander Meeresunters 48, 321–332 (1994). https://doi.org/10.1007/BF02367044

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Helgoland Marine Research

ISSN: 1438-3888

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