1. ALPINE RIVER GIG
Update:
Macroinvertebrates
Phytobenthos

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

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

4. Results
0,96
0,67

5. Results
0,97
0,67

6. 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)

7. 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)

8. Regression between national methods and ICM:
RA1

9. Regression between national methods and ICM:
RA2

10. 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

11. 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

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

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

14. Thank you for your attention!