defining and assessing benthic recovery following dredging and dredged material disposal

Moreover, post-dredging recovery was insufficient for the recovery of the community. The dredging activities led to a reduction in the macrobenthic community. Principal component analysis revealed a correlation with granulometry and heavy metals in the sediment. Richness and Shannon diversity of the species were higher in the pre-dredging and post-dredging periods, with reductions during the dredging activities (dredging 1 and 2). (Polychaeta) was present in all sampling periods and was the dominant species. The most representative groups were Polychaeta, Oligochaeta, Crustacea and Mollusca.

Sampling was performed on four occasions: pre-dredging, dredging 1 (25% of the material dredged), dredging 2 (75% of the material dredged) and post-dredging. 604, Beneficial use p.The aim of the present study was to investigate the effect of dredging activities on the structure of the macrobenthic community of a port complex in São Luís do Maranhão (2°S, Brazil). What You Will Find Here: Physical factors affecting recovery p. Thin layer (< 15 cm) of beneficial use sediment in marsh habitats typically takes two growing seasons for plant recovery. Proximity to unaffected areas also influences recovery time. Mud habitats recover faster (6-8 months) than sand and gravel (2-3 years). Areas with high wave and current energy are often held at early successional stages, and therefore recover more rapidly. If depths of placed material is limited to 20-30 cm, pre-existing benthos can migrate vertically. Summary: Benthic recovery rates range from several months to several years. Presentation from the 2007 WODCON XVIII Conference in Lake Buena Vista, FL (2007) Defining and Assessing Benthic Recovery Following Dredging and Dredged Material Disposal.

Defining and assessing benthic recovery following dredging and dredged material disposal