The dual isotope plot of δ¹³C and δ¹⁵N signatures (mean ± SE) of food sources and bivalves.

<p><i>SC and GC</i> represent two bivalve species <i>Sinonovacula constricta</i> and <i>Glauconome chinensis</i>, respectively. <i>SM</i>, <i>PA and SA</i> represent three plant species of <i>Scirpus mariqueter</i>, <i>Phragmites australis</i> and <i>Spartina alterniflora</i> respectively. POM: particular organic matter. SOM: sediment organic matter. SOM-C and SOM-M represent SOM from the creek and the marshes respectively. Samples taken in summer or winter are indicated with filled or open symbols.