Stable isotopic analysis of human and faunal remains from the Incipient Chulmun (Neolithic) shell midden site of Ando Island, Korea

► We analyzed stable isotope ratios of bone collagen from the Ando shell midden. ► The isotopic results show that marine proteins were important food resources. ► The results are similar to those from other southern Chulmun sites. ► Marine resource exploitation was the main food strategy in southern Chulmun people. ► There were regional differences in diet at the Chulmun period.