Publication Abstract

The effects of marine gravel extraction on the macrobenthic community: Results 2 years post-dredging

A.J. Kenny and H.L. Rees

An offshore experimental dredging study was initiated off north Norfolk (UK) in 1992 to investigate the impacts of marine gravel extraction on the macrofauna. A dredged 'treatment' and a non-dredged `reference' site were selected to evaluate the initial impacts and subsequent processes of recolonisation. A survey of the benthos was conducted prior to the removal of 50,000 tonnes of marine aggregate from the treatment site. Thereafter annual monitoring surveys were conducted commencing immediately after the dredging episode. Results indicated that whilst the dominant species recolonised quickly following dredging many rarer species did not. Evidence from side-scan sonar records and underwater cameras indicated a considerable amount of sediment transport during the first twowinters following dredging and the once well-defined dredge tracks have now been infilled with sand and gravel. The substantially reduced biomass at the treatment site some 24 months after dredging is thought to be due to a local increase in sediment disturbance caused by tide and wave action over the winter period. Finally, the biological findings of this study are discussed in relation to their wider environmental significance.

Reference:

A.J. Kenny and H.L. Rees, 1996. The effects of marine gravel extraction on the macrobenthic community: Results 2 years post-dredging. Pollution Bulletin, 32: 615-622