3.4 Bulk stable isotopes
Bulk δ13C and δ15N values were not linearly correlated (R = 0.004; Fig. 6, see bulk isotopic values in Table S2). Along the δ15N axis, suspension feeders have more negative δ15N values than the remaining functional groups (Fig. 6). Along the δ13C axis, planktivores have the most negative values, and scavengers and benthic predators the most positive δ13C values.