Figure 8
Summary of the models for the blue mussel Mytilus edulis biomasses in the Wadden Sea and flesh/shell ratios in the Wadden and Baltic Sea. Red/blue arrow indicates a negative/positive effect of a predictor on a response variable. Fertilizers are applied to Danish farmland while temperature refers to conditions on the Wadden Sea coastline. Dashed lines indicate indirect effects. Solid black arrows denote stochastic effects from unknown sources and circle arrow illustrates density dependence. Numbers represent the per cent of the total response variance explained by a predictor. R2 comes from regressing log mussel biomass in the Wadden Sea against logit flesh proportion on data the from the Wadden and Baltic Sea (regression coefficient: 1.84, F(1, 14) = 14.4, P = 0.002). Blue mussels and fertilizer-spreading-tractor drawings by Kati Rintala.
