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

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).

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

The Nordic Ecoregion I Kart!!

The Nordic Ecoregion (II)

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

Typology: Common Criteria Geography Climate Geology Ecoregions, biogeography Lowland, Boreal, Highland Siliceous Low Alk. (<0.2 meq/L ) Siliceous Moderate Alk. (0.2 - 1 meq/L) Calcareous (Alk >0.2 - 1 meq/L ) Peat (colour > 30 mgPt/L) Clear (colour < 30 mgPt/L)

Typology: Lake criteria Size (Area) Mean Depth Small (0.5 - 5 km2) Medium (5 - 40 km2) Large (>40 km2) Very shallow (<3 m) Shallow (3-15 m) Deep (>15 m) => 9*12*3 = 384 potential lake types ...

Nordic Lake Types

Lake Quality Elements

Typology: River Criteria Catchment (system A) Small (10-100 km2) Medium (100-1,000 km2) Large (1,000 - 10,000 km2)

Nordic River Types

River Quality Elements

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

Reciprocal averaging, sorted

Site score correlations

Type validation, phytoplankton

Species contribution to site scores => indicator species ?

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