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The assessment of fine sediment accumulation in rivers using macro-invertebrate community response

Extence, C.A.; Chadd, R.P.; England, J.; Dunbar, M.J.; Wood, P.J.; Taylor, E.D.. 2013 The assessment of fine sediment accumulation in rivers using macro-invertebrate community response. River Research and Applications, 29 (1). 17-55. 10.1002/rra.1569

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Abstract/Summary

Increased fine sediment deposition and entrainment in rivers can arise from a combination of factors; including low flows, habitat modification and excessive sediment delivery from the catchment. Physical and visual methods have traditionally been used to quantify the volume of deposited fine sediment (<2mm in size), but here we propose an alternative, the development and utilisation of a sediment-sensitive macro-invertebrate metric (PSI - Proportion of Sediment-sensitive Invertebrates) which provides a proxy to describe the extent to which the surface of river beds are composed of, or covered by, fine sediments. Where suitable biomonitoring data exists, the index can be calculated retrospectively to track trends in fine sediment deposition, and its ecological impact, through time. Furthermore, the utilisation of reference condition models such as RIVPACS, allows site-specific unimpacted conditions to be defined, opening-up the possibility of standard classification and assessment systems being developed. In Europe, such systems are vital if the Water Framework Directive is to be implemented. Knowledge regarding spatial differences in sediment/flow interdependencies may provide valuable information on diffuse sources of fine sediment to rivers and we illustrate this with an example from the UK (Laceby Beck). Further UK case studies are presented to show a range of applications, including the demonstration of improvements in habitat heterogeneity following river restoration (Rivers Chess and Rib) and the detection of fine sediment impacts downstream of an impoundment (Eye Brook). The PSI metric offers a readily-deployable, cost effective and hydroecologically relevant methodology for the assessment of fine sediment impacts in rivers. The technique has potential for application outside of the UK and an adaptation of the methodology for use in the Simandou Mountains (Guinea) is used to illustrate this.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1002/rra.1569
Programmes: CEH Topics & Objectives 2009 onwards > Water > WA Topic 3 - Science for Water Management > WA - 3.4 - Develop novel and improved methods to enable the sustainable management of freshwaters and wetlands
CEH Topics & Objectives 2009 onwards > Water > WA Topic 1 - Variability and Change in Water Systems > WA - 1.2 - Quantify variability and departures from natural historical variability in water quality ...
CEH Sections: Acreman
ISSN: 1535-1459
Additional Information. Not used in RCUK Gateway to Research.: Open Access article. Freely available from publisher's website - follow Official URL or DOI
Additional Keywords: macro-invertebrates, sedimentation, siltation, biotic index, diffuse pollution, sediment erosion and deposition, river restoration
NORA Subject Terms: Zoology
Ecology and Environment
Hydrology
Date made live: 21 Dec 2011 12:26
URI: http://nora.nerc.ac.uk/id/eprint/14802

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