Development of a multimetric index based on macroinvertebrates for drainage ditch networks in agricultural areas.

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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.
Original languageEnglish
Pages (from-to)232-242
JournalEcological Indicators
Volume13
Issue number1
DOIs
Publication statusPublished - 2012

Keywords

  • benthic macroinvertebrates
  • community
  • biodiversity
  • integrity
  • streams
  • ponds
  • conservation
  • macrophytes
  • diversity
  • eutrophication

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  • Projects

    PLONS (KB-01-007-015, KB-01-002-007)

    Verdonschot, P.

    1/01/0831/12/10

    Project: EZproject

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