Figure 1

Chemical features indicative of the nutritional quality of food sources present in both control (black) and CO2-enriched (grey) sites. C/N ratio, N (%), phenolics (mg g−1), soluble sugars (mg g−1), starch (mg g−1) and fibre (%) content of (a) Cymodocea nodosa, (b) Cystoseira compressa, (c) sedimentary organic matter – SOM, and (d) epiphytes. All bars indicate standard deviation. — indicates data not available. Asterisks indicate t-test’s p-value < 0.05.