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Regressions between 3 existing diatom indices and inorganic nutrients across 3 European countries

Abstract : Monitoring eutrophication from benthic diatoms is a common practice in Europe, since this key-compartment is one of the most sensitive to the nutrient enrichment of hydrosystems. However, they have rarely been used to model nitrogen and phosphorus nutrient contents from the responses of diatomic bioindicators. The aim of this talk is therefore to try to model nutrient contents from the scores obtained by 3 diatom indices, PSI, BDI and TDI. This comparative prediction approach is useful for implementing the WFD because it would make it possible to infer nutrient contents from the responses of the diatomic compartment, clearly more integrative of the temporal dimension than an instantaneous water sampling. After log transformation of the nutrient contents, the responses of the PSI and of the BDI follow a linear adjustment and are consistent (R2 of 0.39 versus 0.35). The linear relationship with the TDI is weaker (0, 20), but fits better with a polynomial regression of degree 2 (0.30). The type of watercourse makes a significant influence on the physiognomy and the quality of the relationships found. The responses of these 3 indices to nitrates are weaker, PSI being the most correlated to this nutrient (0.19). It is difficult to find a convincing pattern from graphics for this relationship (large, feathered cloud shape, probably very influenced on some sites by the presence of other more biologically active nutrients). A need for indices more sensitive to the specific effects of this nutrient is therefore felt and constitutes a working track to be pursued, in REBECCA or other future works.
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https://hal.inrae.fr/hal-02610313
Contributor : Migration Irstea Publications <>
Submitted on : Saturday, May 16, 2020 - 7:38:13 PM
Last modification on : Thursday, June 3, 2021 - 5:34:03 PM

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  • HAL Id : hal-02610313, version 1
  • IRSTEA : PUB00064434

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A. Deflandre, Michel Coste, François Delmas, S. Vilbaste. Regressions between 3 existing diatom indices and inorganic nutrients across 3 European countries. Rebecca / WP4 Delft meeting, Dec 2020, Delft, Netherlands. pp.4. ⟨hal-02610313⟩

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