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ICES Journal of Marine Science: Journal du Conseil 2005 62(2):145-162; doi:10.1016/j.icesjms.2004.11.014
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© 2004 International Council for the Exploration of the Sea

The effects of marine sand and gravel extraction on the macrobenthos at a commercial dredging site (results 6 years post-dredging)

S.E. Boyd*, D.S. Limpenny, H.L. Rees and K.M. Cooper

The Centre for Environment, Fisheries & Aquaculture Science, Burnham Laboratory Remembrance Avenue, Burnham-on-Crouch, Essex CM0 8HA, England, UK

*Correspondence to S. E. Boyd: tel: +44 1621 787245; fax: +44 1621 784989. e-mail: S.E.Boyd{at}CEFAS.co.uk.

Benthic recolonization was investigated at a site historically used for the extraction of marine sand and gravel. The main objective was to assess the effects of different levels of dredging intensity on the recolonization of benthic fauna and sediments. Preliminary observations from this study indicated that the fauna within an area of seabed exposed to high dredging intensities remained in a perturbed state some 4 years after the cessation of dredging. Thereafter, annual monitoring surveys of the benthos and sediments at the "treatment" and "reference" sites have followed the recolonization process. Results from univariate and multivariate data analyses show that distinct differences in the nature of assemblages at sites exposed to high and lower levels of dredging intensity persist at least 6 years after the cessation of dredging. This paper presents the physical and biological findings 6 years after dredging, together with a generic framework for evaluating post-cessation recolonization studies.

Keywords: aggregate extraction, dredging, impacts, North Sea, recolonization

Received 30 November 2003; accepted 20 November 2004.


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