This discovery is important for the studies on environmental effects of deep-water currents and of cold springs in the region. This research discovered cold-water corals in a cold seep region of the northern South China Sea. The δ 13C and δ 18O results were close to the carbon and oxygen isotopic values of cold-water corals in other parts of the world, but were quite different from those of warm-water corals, cold-seep carbonate rocks and low-temperature hydrothermal carbonate rocks. Stable carbon and oxygen isotopic analyses revealed that the δ 13C and δ 18O of cold-water corals were -7.36‰ ~ -1.15‰ and -1.38‰ ~ 3.67‰, respectively. We identified two species ( Crispatotrochus sp.1, Crispatotrochus sp.2) and four genera. In this study, we investigated cold-water corals retrieved from the cold seep area in the northern South China Sea. Cold-water corals, also known as deep-water corals, are newly found ecological resources with high biological diversity and attract scientific research on environmental changes.
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