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Table 8 Overview of common metrics and correlations with national methods for different common lake types in different geographical intercalibration groups (GIGs)

From: Ecological status assessment of European lakes: a comparison of metrics for phytoplankton, macrophytes, benthic invertebrates and fish

BQE GIG and country R Pearson between national EQRs and common metrics for different common lake types Common metrics
Phytoplankton Alpine GIG L-AL3 L-AL4 Average of each national methods EQRs (Pseudo-Common Metric)
AT 0.96 0.94
DE 0.93 0.96
IT 0.95 0.95
SI 0.96 0.94
CB GIG LCB1 LCB2 Average of normalised chlorophyll a EQR and phytoplankton trophic index (PTI) EQR
BE 0.79 0.97
DE 0.79 0.93
DK 0.74 0.73
EE 0.53 0.85
FR 0.75 0.83
IE 0.80 0.89
LT 0.48 0.76
LV 0.69 0.72
NL 0.81 0.69
PL 0.91 0.90
UK 0.83 0.88
NOR GIG LN1 LN2a LN2b LN3a LN5 LN6a LN8a Average of normalised chlorophyll a EQR and phytoplankton trophic index (PTI) EQR
FI 0.94 0.69 0.86 0.89 0.94 0.80 0.89
IE 0.90 0.67   0.87    0.93
NO 0.94 0.86 0.87 0.91 0.96 0.86 0.93
SE 0.86 0.57   0.91 0.81 0.61 0.87
UK 0.94 0.85 0.84 0.84    0.89
Macrophytes Alpine GIG All types  
AT 0.74 Average of each national methods EQRs (Pseudo-Common Metric)
FR 0.83
DE 0.86
IT 0.74
SI 0.83
CB GIG All types  
BE 0.63 Average of each national methods EQRs (Pseudo-Common Metric)
DE 0.65
DK 0.80
EE 0.74
LT 0.64
LV 0.61
NL 0.83
PL 0.76
UK 0,67
NOR GIG All types  
FI 0.62 Lake macrophyte intercalibration common metric (ICM)
IE 0.72
NO 0.91
SE 0.67
UK 0.87
Benthic invertebrates ALP GIG All types  
DE 0.76 Weighted average of Fauna index, taxa richness, reproduction strategy (r/k), % feeding type gatherer
SI 0.94
CB GIG   
BE-FL 0.56 Weighted average of normalised values of number of EPTCBO taxa, ASPT, % ETO, % Habitat preference lithal (MMI)
DE 0.63
EE 0.63
LT 0.36
NL 0.70
UK 0.43
NOR GIG ACID All types  
SE 0.45 Average of each national methods EQRs (Pseudo-Common Metric)
UK 0.66
NO 0.75
Fish ALP GIG All types  
AT 0.97 Average of each national methods EQRs (Pseudo-Common Metric)
DE 0.97
SI 0.84
Phytobenthos Cross GIG High alkalinity type Moderate alkalinity type  
BE 0.88 0.89 Trophic Index (TI)
DE 0.77  
FI   0.90
IE 0.89 0.77
PL 0.80  
SE 0.63 0.74
UK 0.94 0.87
SI 0.94  
HU 0.87  
  1. Common metrics highlighted in bold are those developed by WISER and included in this paper. For details, see https://circabc.europa.eu/w/browse/c48010c0-863b-49e6-8f1a-22da029cd93b