| Water category: | River |
| Pressure categories | Nutrients |
| Pressure detail | Phosphorus concentration |
| WFD Indicators- R | Phytoplancton Macrophytes and phytobenthos Composition Abundance |
| Specific Index | Trophic Diatom Index |
| Brief text description | Equation to calculate the Trophic Diatom Index (TDI) by using some species phosphorus preferences. |
| Long text description | A classification of river sites has been developed for the UK based on the Trophic Diatom Index (TDI) as an indicator of eutrophication (Kelly, 1998). The TDI values range from 0 (indicating very low nutrient concentrations) to 100 (indicating very high nutrient concentrations). |
| History of development | These indicator values have then been used to create a number of indices that include this indicator value and the relative abundance of each taxa: Specific Pollution Sensitivity Index (Cemagref - 1982), Generic Diatom Index (Coste et al., 1991), Descy’s Index (Descy, 1979), Sládeèek’s index, Leclerq & Maquet’s index (Leclercq et al., 1987), Trophic Diatom Index (Holmes et al., 1999, Kelly et al., 2001, Kelly et al., 1998) and EPI-D (Dell'Uomo, 1997, Dell'Uomo et al., 1999) are some of them. They usually only consider diatoms. The Periphyton Index of Biotic Integrity (PIBI) developed by Hill (2000) is one of the few indices to include other type of benthic algae. However, it is limited to only 2 blue-green taxa. |
| References | Kelly, M. G., Adams, C., Graves, A. C., Jamieson, J., Krokowski, J., Lycett, E., Murray-Bligh, J., Prit-chard, S. and Wilkins, C. (2001). The Trophic Diatom Index: A Users Manual. E2/TR2, Environ-ment Agency, Bristol. P |
| Geographical region (GIG) - R | |
| Ecoregion - LR | |
| Country | UK United Kingdom |
| Geographical location of source data | |
| Reference conditions | Unknown |
| Development | Existing |
| Uncertainty | Unknown |
| Link to document store | No |
| BMW Toolbox | No |
| Entry status | Unvalidated |