Figure 3 Effects of shading, snail biomass and nutrient loading on P. crispus elemental composition (C, N, and P contents) and stoichiometry (C:N, C:P, and N:P ratio). P. crispus C content(A) , N content (B) , P content (C) , C:N ratio(D) , C:P ratio (E) , and N:P ratio (F) . A solid line indicates p < 0.05, and dashed line indicates p > 0.05. Dots indicate nutrient loading, and triangle points indicate no nutrient loading. P values in the panel indicate significant difference of the means between the two light intensity treatment.