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The Dongdao Island of Xisha Islands is an epitome of the island eco-system of South China Sea,andred-footed booby (Sula sula) and Pissonia grandis are typical species of the island community.However,a large herbivore ‘urus’ (actually cattle) is now threatening the survival of other species.Weanalyzed the lithology,as well as organic carbon and nitrogen concentration and isotopes of thesediment core DY2 sampled from the ‘Cattle Pond’ of Dongdao Island,Xisha Islands.