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Poster De Conférence Année : 2017

Towards easy-handling tools to assess functional effects of contaminants on natural microbial and invertebrate sediment communities

Vers un outil simple pour évaluer les effets fonctionnels des contaminants sur les communautés microbiennes et d'invertébrés des sédiments

Résumé

Sediments play a critical role in biogeochemical cycling and in the maintenance of the biodiversity. They are natural sinks for many contaminants which can accumulate over time and impact exposed communities, thereby disturbing the functioning of aquatic ecosystems. However, knowledge about the functional effects of contaminants on benthic communities is scarce and there is a need of ecosystem functioning indicators of ecotoxicological impacts. In the present microcosm study, we assessed the individual and combined effects of Cu and As (40 mg kg dw-1 each, 21 days of exposure) on the capacity of natural micro- and macro-organism communities from an uncontaminated river sediment to consume and decompose particulate organic matter using the bait lamina method (ISO 18311) as well as artificial tablets consisting of cellulose, bran flakes and active coal embedded in an agar matrix. The sediment toxicity was also evaluated using the standardized ostracod toxicity test (ISO 14371:2012). The two tested substrates (i.e. bait lamina and artificial tablets) showed similar results with low effects of As on feeding activity and organic matter breakdown whereas Cu demonstrated a strongest functional effect. When the two metals were combined, a total functional inhibition was observed, whatever the kind of substrate. The ostracod toxicity test also showed high toxicity of Cu-spiked and mixture-spiked sediments and low toxicity of As-spiked sediments. Our results highlight the relevance of artificial organic matter substrates to assess the functional effects of contaminants on sediment micro- and macro-organism communities, opening new perspectives to assess the functional integrity of contaminated sediments.
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Dates et versions

hal-02606936 , version 1 (16-05-2020)

Identifiants

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Stéphane Pesce, Sophie Campiche, Ayanleh Mahamoud Ahmed, C. Casado Martinez, C. Bonnineau, et al.. Towards easy-handling tools to assess functional effects of contaminants on natural microbial and invertebrate sediment communities. 1st International Conference on Microbial Ecotoxicology (EcotoxicoMic 2017), Nov 2017, Lyon, France. pp.1, 2017. ⟨hal-02606936⟩
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