Figure 4. Ecoregion comparison of predicted and observed demersal fish biomass (both in tonnes per km2) averaged between 1990-2015. The predicted biomass is estimated using the trophodynamic model with a trophic transfer efficiency of 0.075 and a temperature scaling (Q 10) of the trophic transfer efficiency of 0.55 (see Figure S2.5 for a range of values). The dashed line is the 1:1 line, and the solid line is a linear fit. R2 is the coefficient of determination, RMSE the Root Mean Square Error. Similar results are obtained when analysis is done at subdivision scale (Figure S2.6).
Table 1. Analysis of temporal demersal biomass variation in ecoregions with different recursive biomass models and surplus production models. The ΔAIC is obtained by subtracting the AIC of a model with a temperature term θT from the AIC of a model without this term.