The figure 4 shows the different trophic relationships between every functional species of the model. The thickness of the arrows represents the intensity of the trophic preference from a predator toward its prey. The greyed species are the one with a total biomass below 1e-15 mmol C. Because it is an eulerian model,  the biomass would never reach 0, thence this limit tells apart the surviving species from the once that do not. Most of the greyed species do not survives because the allometric nitrogen quota values that are attributed to them are unrealistic for species bigger than 200 µm preventing their growth. This is one particularity of the quota approach and will be discussed further into details in the part “recommandations”. The trophic food web can be divided into six cluster, essentially divided by the size range of the prey and the size of the predator, where the top predators are the three Calanus like functional species, here under the label 47, 48 and 49.