Table 2

Multiple linear regression models of mean density and percentage of occurrence of Pyrenean sculpin Cottus hispaniolensis based on habitat and biotic variables (see text). Models were created with stepwise multiple regressions (Adj. = adjusted; RMSE = residual mean square error). The significance level for inclusion of predictor variables was 0.05.

Metric Model Variable Coefficient P

  Adj. R2 RMSE      
Density 0.78 0.44 Intercept −8.178 0.0002
      Boulders 0.140 <0.0001
      Cobble 0.123 0.0006
      Sand 0.056 0.0149
Presence 0.72 16.30 Intercept −281.870 0.0003
      Boulders 4.412 <0.0001
      Cobble 4.581 0.0006
      Sand 2.178 0.0023

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