1. WG 2A Ecological Status - Ispra, october 15-17th, 2003
Intercalibration : comparing methods comparing boundaries some key issues… 1

2. e.g. : France - IBGN Index IBGN index National Database + 3300 sites
national standard (1992),
« Biotic Index », Invertebrates, family level
2 metrics :
Taxa Richness,
GFI : Sensititive taxa
range 1-20
National Database
sites
samples ( ) 1

3. IC Key Issues Reference values Good status boundary Typology :
- Hydro-ecoregions
- stream order 1

4. Selecting reference sites (IBGN) from Expert Judgement
IBGN Sites
Invertebrates
Reference Database
From Research Institutes
Cemagref
GIS Selection
Land use
Pollution
Expert Selection
field Hydrobiologists
With guidance
1 - Expert
Reference
300 sites
3 - Cemagref
Reference
92 sites
2 - GIS
Reference
172 sites
3 Reference datasets

5. Consolidated Reference values by Types
Alpes
MCS
Med
pAlpS
Cév TC MA
MCN
DepArgSab
Jura-pAlpN
Sensitive
Taxa
GFI
Taxa
Richness
Median
IBGN values

6. IBGN Good status boundary : Biological approach
1 - 2 pts
3 - 4 pts
REFCOND
Guidance

7. Comparing MS boundaries
If 3 MS get for G/M boundary : 0.6, 0.7, 0.8
Is it a difference in
Method or
Ecosystem alteration ?
0.8
0.7
0.8
0.6
0.7
0.6
Harmonizing
Boundaries :
Political problem
Rescaling methods
Technical problem