A. MLR X+Y+Z X+2Y+Z X+2Y+2Z 2X+Y+Z 2X+2Y+Z 3X+Y+Z 3X+2Y+

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X+Y+Z X+2Y+Z X+2Y+2Z 2X+Y+Z 2X+2Y+Z 3X+Y+Z 3X+2Y+Z 2X+3Y+Z 3X+3Y+Z 1.5X+1.5Y+Z X+Y 2X+Y X+2Y AIC = -730.04. /3. /4. /5. /4. /5. /5. /6. /6. /7. /4. /2.

Table 8. Models tested using the indices ES10 (X), BENTIX_B (Y) and BENTIX (Z): A. Mean ecological quality ratio (EQR) values using the original data set; B. Mean EQR values using independent data for validation. In black: models selected for validation; in dark grey: models with three indices; in light grey: models with two indices; in white: multiple linear regression (MLR) model, and MarMAT assessment results [(EQR and associated ecological quality status (EQS)]. In bold: highest correlations with MarMAT. A.

RMAT samples

Three indices Two indices MarMAT MLR X+Y+Z X+2Y+Z X+2Y+2Z 2X+Y+Z 2X+2Y+Z 3X+Y+Z 3X+2Y+Z 2X+3Y+Z 3X+3Y+Z 1.5X+1.5Y+Z X+Y 2X+Y X+2Y AIC = -730.04 EQR EQS /3 /4 /5 /4 /5 /5 /6 /6 /7 /4 /2 /3 /3 R2 = 0.3933 Site 1 0.551 0.557 0.586 0.507 0.521 0.480 0.496 0.530 0.508 0.532 0.475 0.442 0.509 0.735 0.667 G Site 2 0.678 0.700 0.723 0.622 0.650 0.588 0.617 0.669 0.638 0.661 0.608 0.556 0.660 0.786 0.806 H Site 3 0.756 0.767 0.784 0.722 0.737 0.701 0.717 0.748 0.729 0.744 0.708 0.678 0.739 0.812 0.861 H

Site 1 Deviation from MarMAT Site 2 Site 3

0.116 0.127 0.105

0.110 0.106 0.094

0.081 0.082 0.077

0.160 0.184 0.139

0.146 0.156 0.124

0.186 0.218 0.160

0.170 0.189 0.144

0.137 0.137 0.114

0.159 0.168 0.132

0.135 0.191 0.225 0.158 0.145 0.198 0.250 0.146 0.117 0.153 0.183 0.122

-0.068 0.019 0.050

Correlation with MarMAT

0.579

0.569

0.576

0.554

0.566

0.528

0.550

0.564

0.558

0.572 0.535 0.505 0.539

0.627

Site 1 Site 2 Site 3

0.433 0.465 0.571

0.435 0.472 0.572

0.465 0.503 0.611

0.394 0.418 0.520

0.403 0.433 0.531

0.370 0.389 0.490

0.381 0.407 0.504

0.409 0.443 0.539

0.390 0.419 0.515

0.414 0.357 0.329 0.384 0.445 0.385 0.348 0.421 0.546 0.472 0.438 0.507

0.679 0.470 0.700 0.630 0.749 0.750

Site 1 Deviation from MarMAT Site 2 Site 3

0.037 0.165 0.179

0.035 0.158 0.178

0.005 0.127 0.139

0.076 0.212 0.230

0.067 0.197 0.219

0.100 0.241 0.260

0.089 0.223 0.246

0.061 0.187 0.211

0.080 0.211 0.235

0.056 0.113 0.141 0.086 0.185 0.245 0.282 0.209 0.204 0.278 0.312 0.243

-0.209 -0.070 0.001

Correlation with MarMAT

0.406

0.376

0.409

0.396

0.377

0.387

0.375

0.361

0.363

0.388 0.325 0.334 0.310

0.397

B. Validation samples

M G G