Water Framework Directive Intercalibration: Central-Baltic Lake Fish fauna ecological assessment methods (original) (raw)
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HAL (Le Centre pour la Communication Scientifique Directe), 2017
The European Water Framework Directive (WFD) requires the national classifications of good ecological status to be harmonised through an intercalibration exercise. In this exercise, significant differences in status classification among Member States are harmonized by comparing and, if necessary, adjusting the good status boundaries of the national assessment methods. Intercalibration is performed for rivers, lakes, coastal and transitional waters, focusing on selected types of water bodies (intercalibration types), anthropogenic pressures and Biological Quality Elements. Intercalibration exercises are carried out in Geographical Intercalibration Groups-larger geographical units including Member States with similar water body types-and followed the procedure described in the WFD Common Implementation Strategy Guidance document on the intercalibration process (European Commission, 2011). The Technical report on the Water Framework Directive intercalibration describes in detail how the intercalibration exercise has been carried out for the water categories and biological quality elements. The Technical report is organized in volumes according to the water category (rivers, lakes, coastal and transitional waters), Biological Quality Element and Geographical Intercalibration group. This volume addresses the intercalibration of the Lake Central-Baltic Fish ecological assessment methods. Part A: This document comprises an overview and detailed descriptions of fish-based lake ecological assessment methods. Part B describes the construction of multiple pressure index in the Central-Baltic region. Part C describes the procedure and results of the boundary harmonisation of national fishbased lake assessment systems. MS Benchmark, derivation of reference conditions BE-F Reference: historical data, lakes of the pike-tench-roach type represent the reference condition CZ Alternative: LDC sites, literature review and expert judgment DE Continuous/alternative: LDC sites and expert knowledge, pressure-response and site class distribution DK Reference: paleolimnological data (for trophic reference), equals LDC combined with expert judgment EE Reference: historical data, expert knowledge, LDC sites FR Continuous: site specific hindcasting method LT Reference: compared to LDC NL Reference: LDC sites and expert knowledge PL Reference: historical data and expert knowledge (LFI+), LDC and expert knowledge (LFI-EN)