Isotopic signatures (δ13C and δ15N values, mean ± SEM) of common zoobenthic species and fish in the Neva Estuary. Cp – Chironomus plumosus, Lh – Limnodrilus hoffmeisteri, Ph – Potamothrix hammoniensis, Mo – Monoporeia affinis, Mar – Marenzelleria arctia, Se – Saduria entomon, Ab – Abramis brama, Rr – Rutilus rutilus.