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• W2080822437 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 319:27-41 (2006) - doi:10.3354/meps319027 Changes in biota and sediment erodability following the placement of fine dredged material on upper intertidal shores of estuaries J. Widdows1,*, M. D. Brinsley1, N. D. Pope1, F. J. Staff1, S. G. Bolam2, P. J. Somerfield1 1Plymouth Marine Laboratory, Prospect Place, West Hoe, Plymouth PL1 3DH, UK 2Centre for Environment, Fisheries and Aquaculture Science Laboratory, Remembrance Avenue, Burnham-on-Crouch, Essex CM0 8HA, UK *Email: j.widdows@pml.ac.uk ABSTRACT: Fine sediments derived from maintenance dredging in estuarine and coastal zones may provide a potential resource for enhancing or creating intertidal habitats (i.e. ‘beneficial use’ schemes). This study investigates the temporal changes in biota and sediment erodability following the placement of fine dredge material (ca. 0.6 m depth) on the upper shore at 2 trial ‘beneficial use schemes’ in estuaries situated in Essex, UK. There was a rapid process of sediment consolidation and dewatering within 7 d, reaching bulk densities and water contents typical of intertidal sediments within 6 wk. This was accompanied by an increase in critical erosion velocity (Ucrit) from 0.13 to 0.25 m s–1 (equivalent to a bed shear stress of 0.04 and 0.12 Pa) and a reduction in sediment erosion by 2 orders of magnitude. There was evidence of marked spatial (inter-site) and temporal variation in sediment stability which correlated with changes in the abundance of key species. The temporal changes in sediment erodability reflected the nature of benthic assemblages established during the recovery period (up to 19 mo). There were statistically significant correlations between microphytobenthos chl a, extracellular polymeric substances (EPS) and Ucrit, and between total abundance of tube building/ dwelling polychaetes and oligochaetes (minus Hediste diversicolor) and mass of sediment eroded at 0.3 m s–1. The annual salt marsh plant Salicornia europaea was also found to reduce sediment erodability by reducing near-bed flows by up to 90%, as well as increasing Ucrit. These biota represented ecosystem engineers with a functional role as bio-stabilisers. There were also significant correlations between Ucrit and the abundance of H. diversicolor and Corophium volutator, and between sediment mass eroded at 0.3 m s–1 and H. diversicolor and Hydrobia ulvae. These biota represented ecosystem engineers with a functional role as bio-destabilisers. Most of the recorded correlations were consistent with previous species-specific flume studies establishing density-dependent effects on sediment erodability, thus indicating cause-effect relationships. KEY WORDS: Estuaries · Sediment · Dredged material · Erodability · Biota · Current velocity · Temporal variability · Essex Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 319. Online publication date: August 18, 2006 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2006 Inter-Research." @default.
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• W2080822437 date "2006-08-18" @default.
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• W2080822437 title "Changes in biota and sediment erodability following the placement of fine dredged material on upper intertidal shores of estuaries" @default.
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