1. Developing a common approach for typology and classification of inland waters in the Nordic region Anders Hobæk Norwegian Institute for Water Research

2. Project aim
Evaluate the suggested Nordic core types according to applicability and possible usefulness in a forthcoming international intercalibration exercise according to Water Framework Directive (WFD).

3. Project organisation
Coordinated efforts funded by the Nordic Council of Ministers
Finland, Sweden, Norway, some integration with Denmark
Four workshops, compilation of national monitoring data between workshops

4. The Nordic Ecoregion I
Kart!!

5. The Nordic Ecoregion (II)

6. Approach
Evaluate common core types of water bodies in the Nordic Ecoregion based on preliminary typology by JRC Ispra
Assess availability of monitoring data for all quality elements
Suggest preliminary sites for inter-calibration of common water body types

7. Typology: Common Criteria
Geography
Climate
Geology
Ecoregions, biogeography
Lowland, Boreal, Highland
Siliceous Low Alk. (<0.2 meq/L )
Siliceous Moderate Alk. ( meq/L)
Calcareous (Alk > meq/L )
Peat (colour > 30 mgPt/L)
Clear (colour < 30 mgPt/L)

8. Typology: Lake criteria
Size (Area)
Mean Depth
Small ( km2)
Medium ( km2)
Large (>40 km2)
Very shallow (<3 m)
Shallow (3-15 m)
Deep (>15 m)
=> 9*12*3 = 384 potential lake types ...

9. Nordic Lake Types

10. Lake Quality Elements

11. Typology: River Criteria
Catchment (system A)
Small ( km2)
Medium (100-1,000 km2)
Large (1, ,000 km2)

12. Nordic River Types

13. River Quality Elements

14. Water body type validation
Correspondence analysis of species abundance (Reciprocal averaging)
Weighted lake scores, test for significant differences between lake types (ANOVA)
Example: Phytoplankton, 16 lake types, - only potential reference lakes - disregard lake size and ecoregion

15. Reciprocal averaging, sorted

16. Site score correlations

17. Type validation, phytoplankton

18. Species contribution to site scores
=> indicator species ?

19. Further work (?) What can be made of questionable types?
Handle high altitude lakes
Include additional types
Reference conditions, including lowlands
Common test of the morpho-edaphic index for estimating [P], with inclusion of humic content