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Article Dans Une Revue Hydrobiologia Année : 2016

Experimental study of the uncertainty of the intrasubstrate variability on two French index metrics based on macroinvertebrates

Résumé

Chemical and biological assessments of waterbodies are required to fulfil the objectives of the European Water Framework Directive (EU Off J 327:1–72, 2000). Many past studies have been focused on water chemistry uncertainties, but few have been carried out on the hydrobiological aspects. Considerable research on macroinvertebrates has highlighted the mosaic habitat impact on the macroinvertebrate distribution, substrate type and within-substrate heterogeneity as uncertainty sources. We thus studied the effect of substrate variability on the metrics of two French biological indices (normalized index IBGN and new index I2M2 metrics) using experimental field sampling based on substrate replicates. For each of the nine substrates studied, a minimum of 2 sites were selected (among a total of 31 sites) in 7 hydroecoregions (HER). Ten replicates per substrate and site were collected where possible. We obtained 315 faunistic lists associated with 315 substrate replicates. Twelve metrics, such as the Shannon index and variety class, were calculated by list. We used multidimensional scaling and similarity indices to analyse the substrate variability effect. Our results highlighted the extent of HER and site features on the within-substrate heterogeneity. Faunistic lists and metrics varied more in root and sand substrates than in other substrates. I2M2 metrics, i.e. ASPT, taxonomic richness or H’, calculated on each replicate, eliminated the intrasubstrate variability.
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Dates et versions

hal-01343051 , version 1 (07-07-2016)

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Juliane Wiederkehr, Corinne Grac, Bruno Fontan, Frédéric Labat, Florence Le Ber, et al.. Experimental study of the uncertainty of the intrasubstrate variability on two French index metrics based on macroinvertebrates. Hydrobiologia, 2016, ⟨10.1007/s10750-016-2799-2⟩. ⟨hal-01343051⟩
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