Stable isotope values (δ¹³C [‰] and δ¹⁵N [‰]) (means ± SD) of <i>Multioppia neglecta</i> (Mult_negl; yellow), <i>Hermannia pulchella</i> (Herm_pulc; blue) (adults and juveniles), <i>Zachvatkinibates quadrivertex</i> (Zach_quad; red), <i>Ameronothrus schneideri</i> (Amer_schn; brown) (adults and juveniles) at different salt marsh zones [upper salt marsh (USM), lower salt marsh (LSM), pioneer zone (PZ)] and artificial island heights [LSM_upp (120 cm), LSM_mid (90 cm), LSM_low (60 cm)].

Dotted ellipses in light green (drawn by eye) mark C3 plants (Al- Atriplex littoralis, Ap- Atriplex prostrata and Atriplex portulacoides, Ea- Elymus athericus, Pm- Puccinellia maritima, Se- Salicornia europaea, Ss- Spergularia salina, Tm- Triglochin maritima, Fv- Fucus vesiculosus, Lv- Limonium vulgare, Sas- Salicornia stricta and Sm- Suaeda maritima) and in dark green C4 plants and algae (Csp- Ceramium sp., Cl- Chaetomorpha linum, Esp- Enteromorpha sp., Rr- Rhizoclonium riparium, Sa- Spartina anglica and Ul- Ulva lactuca); org. mat., organic matter (dark brown). Black arrows from the LSM to the three artificial island heights indicate the vegetation zone where soil, plants and species originated from.