Fig. 1

Effects of two seagrass species in the chlorophyll content (resembling the food intake) of Cerastoderma edule assayed under field conditions. Data are presented as mean ± SD (n = 21). Different letters indicate significant differences between treatments determined by post hoc Tuckey’s test. See “Statistical analysis” section for further details on statistical procedure. Note that in the plotted data the chlorophyll content of the starved cockles has not been subtracted from the experimental data, while this was done in the data showed in the “Results” section