Development of a multimetric index based on macroinvertebrates for... (2012)

Title Development of a multimetric index based on macroinvertebrates for drainage ditch networks in agricultural areas.
Published in Ecological Indicators, Vol. 13, No. 1, p.232-242. ISSN 1470-160x.
Author Verdonschot, R.C.M.; Keizer-Vlek, H.E.; Verdonschot, P.F.M.
Date 2012
Reference(s) CE - Freshwater Ecosystemen, Extern overig, CE - Freshwater Ecosystems, Extern other
Language English
Type Article
Abstract Drainage ditches are a prominent feature of many intensively managed agricultural areas. These small, shallow, line-shaped waterbodies could harbor a rich macroinvertebrate community, resembling that of natural small lentic ecosystems. Despite their high biodiversity potential, many ditch ecosystems are degraded due to nutrient enrichment, resulting in a shift from a mesotrophic system characterized by a diverse vegetation of emergent-, submerged-, and floating macrophytes to a hypertrophic state dominated by Lemnaceae or phytoplankton. Tools to assess the ecological quality of drainage ditches are currently lacking. Therefore, a multimetric index based on macroinvertebrates was developed to assess the ecological quality of drainage ditch systems in The Netherlands. Based on a large dataset from regional water district managers, who conduct routine sampling of macroinvertebrates in drainage ditches, a degradation gradient composed of 223 samples was derived, which represented the combined stressors eutrophication, organic pollution and salinity. We used a stepwise process to evaluate the discriminatory efficiency of a variety of diversity, abundance/composition, tolerance/sensitivity, and functional metrics for assessing ecological degradation in drainage ditches. After evaluating metric range, strength of correlation to the stressor gradient, degree of redundancy, and sample- and seasonal repeatability, five metrics were selected for the drainage ditch multimetric index: number of Trichoptera families, percentage of Gastropoda families, percentage of taxa preferring fresh water (Cl− < 300 mg L−1), Dutch Saprobic index, and the percentage of predator taxa. The relationship of these single metrics with the stressor gradient is discussed.
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Persistent Identifier urn:nbn:nl:ui:32-417396
Metadata XML
Source Wageningen University & Research Centre

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