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Use of auto-ecological characteristics of diatoms taxa to assess the level of man-made trophic enrichment throughout European ecoregions and river types

Abstract : The first step of the implementation of the Water Framework Directive (WFD) aims at assessing the ecological status of each European hydrosystem, in a consistent way across the EU Member-States, in order to preserve or reach a good ecological status by 2015. For this purpose, it is necessary to distinguish between impacted communities and their reference state. For a good accuracy, this needs to first precise the part of the natural variation, in a global way (biological index notes) and at the level of communities composition (biotypes). The REBECCA project, funded by the EU 6th Framework program, supports the implementation of the WFD by exploring the relationships between chemical parameters in hydrosystems and their ecological status. The analyses presented here focus on the alteration of diatom communities in rivers resulting from anthropogenic enrichment by nitrogen and phosphorus across a broad range of geochemical gradients found in Europe, based on data from France, Estonia and U.K. They build on previous work on the variability of the diatom communities, based on the same data, which has led to the definition of natural and disturbed river biotypes characterised by their diatom assemblages. Existing diatom indices use indicator values of diatoms dedicated to the country or the region of application. The work presented here goes further by analysing autoecological traits regarding eutrophication and organic pollution for each diatom species. Van Dam et al. * (1994) initiated such approaches with a classification of diatoms according to their autoecological traits in the Netherlands. In a comparable way, this work aims to study the ecological response of diatom communities and indicative species to nutrient enrichment. The approach has been driven chemical species per chemical species, then with integrated descriptors of nutrient enrichment. We used different biomathematical tools (CCA, neural networks...) to classify the autoecological profiles of species, then to derive individual and combined metrics applicable across the 3 countries represented in our analyses. These metrics based on trophic ecological homologies can be used as a useful framewok to build improved diatom indices able to assess the effects of nutrient enrichment in a more consistent way at the european broad scale.
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https://hal.inrae.fr/hal-02610335
Contributor : Migration Irstea Publications <>
Submitted on : Saturday, May 16, 2020 - 7:39:04 PM
Last modification on : Thursday, June 3, 2021 - 5:34:03 PM

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  • HAL Id : hal-02610335, version 1
  • IRSTEA : PUB00064462

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François Delmas, Sébastien Boutry, A. Deflandre, J. Fisher, Juliette Tison-Rosebery, et al.. Use of auto-ecological characteristics of diatoms taxa to assess the level of man-made trophic enrichment throughout European ecoregions and river types. 6th International Symposium on Use of Algae for Monitoring Rivers, Sep 2006, Balatonfüred, Hungary. pp.29. ⟨hal-02610335⟩

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