ALPINE RIVER GIG Update: Macroinvertebrates Phytobenthos

Introduction: Common Intercalibration Type: Alpine Rivers From: ECOSTAT WG 2.A, 2004: Overview of common Intercalibration types

Macroinvertebrates Italy has revised the national assessment method (ICMi) Reference criteria Calculations ICMi alpine Data set is missing Accepted by GIG

Results 0,96 0,67

Results 0,97 0,67

Phytobenthos First (preliminary) results Final check of calculations and data sets Calculation of the ICM – metrics: Similar to the Central Baltic GIG: IPS: EQR_IPS = Observed value / reference value TI: EQR_TI = (4-observed value) / (4-reference value ) Calculation of the final ICM: Arithmetic mean of IPS and TI (Minimum of IPS and TI was also tested)

MS National metric Austria Multimetric method: trophic status module (based on TI: Rott et al. 1999) saprobic status module (based on SI: Rott et al. 1997) reference species module (portion of defined reference and bioregion-specific species in total abundance and species number) worst-case-approach France IBD (national routine index: AFNOR, 2000) IPS (one of the reference indices: Lenoir & Coste, 1996) Germany Diatom Module Non Diatom Module Macrophyte Module Ecological status: average of the three module scores Italy Slovenia Saprobic index (Zelinka & Marvan 1961) Trophic index (Rott et al. 1997) worst case approach Spain three indexes: IPS (Coste in Cemagref 1982) IBD (Prygiel & Coste 2000) CEE (Descy & Coste 1990, 1991) (IPS seems to be the most adequate index for the Alpine GIG)

Regression between national methods and ICM: RA1

Regression between national methods and ICM: RA2

Data from Regressions: number of sites reference sites R² lowest EQR value Type R-A1 Austria 157 18 0,96 0,39 France 117 66 0,56 0,43 Germany 46 9 0,90 0,20 Italy - Slovenia 11 4 0,68 0,60 Type R-A2 111 17 0,92 0,27 52 26 0,82 Spain 40 6 0,81 0,66

National boundary ICMi Boundary values:   National boundary National boundary ICMi MS H/G G/M value +/-95% CL Type R-A1 Austria 0,87 0,56 0,92 0,003 0,72 0,006 France 0,86 0,71 0,020 0,76 0,031 Germany 0,73 0,54 0,011 0,78 0,018 Italy - Slovenia 0,80 0,60 0,95 0,054 0,75 0,106 Type R-A2 0,008 0,012 0,84 0,024 0,69 0,034 Spain 0,94 0,74 0,89 0,023 0,67 0,051

Boundary values at the ICM-scale (+/- 95% CL) The Band represents the average boundary values +/- 0.05

Boundary values at the ICM-scale (+/- 95% CL) The Band represents the average boundary values +/- 0.05

Thank you for your attention!