Are mussel beds a favourable habitat for settlement of Hemigrapsus sanguineus De Haan, 1835Report as inadecuate




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1 M2C - Morphodynamique Continentale et Côtière

Abstract : Along the French coast of the English Channel, Hemigrapsus sanguineus De Haan, 1835 is abundant under boulders on exposed shores that have high-energy hydrodynamic conditions in the intertidal zone. However, small individuals < 6 mm are rare in the muddy gravel sediments under boulders and the settlement habitat for post-larvae is largely unknown. This study explored whether mussel beds could represent a settlement zone for H. sanguineus. At the end of the summer of 2013, there were many post-larvae and small crabs in some mussel beds, with up to 528 individuals-m². However, at one location, no juveniles of H. sanguineus were found in mussel bed habitat despite the presence of adults on the same shore. We conclude that mussel beds are an important habitat for the settlement of juvenile crabs.

Keywords : English Channel Asian shore crabs invasive marine species





Author: Jean-Philippe Pezy - Jean-Claude Dauvin -

Source: https://hal.archives-ouvertes.fr/



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