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Table 6 Comparison of correlation coefficients (r) of metrics representing four Biological Quality Elements (BQE) (r is equivalent to the standardised regression slopes (b *1 ))

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

Metric BQE |r| (=|b1*|) Rank order r Rank order b *1 Mean rank order
Chla Phytoplankton 0.787 7 4 5.5
ICM Macrophytes 0.740 5 3 4
PTI Phytoplankton 0.707 3 2 2.5
FTI Phytoplankton 0.700 2 2 2
NLFI Fish 0.680 2 2 2
Ellenberg Macrophytes 0.687 2 1 1.5
MMI Benthic invertebrates 0.603 0 1 0.5
Cyano Phytoplankton 0.634 0 0 0
C max Macrophytes 0.562 −2 −2
Evenness Phytoplankton 0.393 −9 −7 −8
ELFI Fish 0.359 −9 −7 −8
  1. Rank orders were derived from pairwise comparisons and reflect the level of metric performance in the analysis. Ranks were calculated by summing up the number of other metrics that were significantly lower in correlation/slope (scoring +1) or higher (scoring −1) than the considered metric. All significances at P < 0.05, corrected for multiple pairwise comparisons using the Bonferroni method