海洋地质与第四纪地质2025，Vol.45Issue(6)：129-140,12.DOI:10.16562/j.cnki.0256-1492.2025061001
南海海马冷泉大型底栖生物碳-氮-硫稳定同位素特征及其食物网结构
Carbon-nitrogen-sulfur stable isotope signatures and food web structure of macrofauna in the Haima cold seeps,South China Sea
摘要
Abstract
Deep-sea cold seep ecosystems are characterized by chemosynthesis-based trophic networks that support dense and diverse macrofaunal assemblages independent of sunlight.The trophic structure of six representative macrofaunal species—including Gigantidas haimaensis(mussel),Archivesica marissinica(clam),Paraescarpia echinospica(tubeworm),Branchipolynoe pettiboneae,Phymorhynchus buccinoides,and Neolithodes brodiei(king crab)—collected from the Haima cold seeps in the South China Sea,were investigated.Stable isotopes of carbon(δ13C),nitrogen(δ15N),and sulfur(δ34S)of dissected soft tissues were analyzed,and the metabolic pathways and trophic networks were elucidated.Results show that G.haimaensis had extremely low δ13C values(63.9‰ to 52.5‰),indicating symbiosis with methane-oxidizing bacteria.In contrast,the clam and tubeworm exhibited higher δ13C values and markedly low δ34S values,being consistent with sulfide oxidation.Predatory species such as B.pettiboneae that obtain energy from mussels by parasitic means,and P.buccinoides show intermediate δ13C and elevated δ15N values,suggesting dietary reliance on mussels.The king crab occupied the highest trophic level with the highest δ15N(8.8‰ to 11.2‰).The Bayesian mixing model(MixSIAR)was employed to estimate dietary contributions,allowing us to construct a trophic framework of the Haima seep ecosystem.This study highlights the application of multiple stable isotope tracers in resolving the carbon and sulfur cycling pathways and provided new insights into the biogeochemical interactions between cold seep fluids and benthic macrofauna.关键词
冷泉生态系统/大型底栖生物/稳定同位素/食物网Key words
cold seep ecosystem/macrofaunal assemblages/stable isotopes/food web分类
海洋科学引用本文复制引用
ZHUO Bolin,WANG Xudong,JIA Zice,LIANG Qianyong,FENG Dong..南海海马冷泉大型底栖生物碳-氮-硫稳定同位素特征及其食物网结构[J].海洋地质与第四纪地质,2025,45(6):129-140,12.基金项目
国家自然科学基金"冷泉双壳类微量元素和Cu同位素组成对甲烷有氧氧化过程的示踪"(42106059) （42106059）
上海市教育发展基金会和上海市教育委员会"晨光计划"(22CGA58) （22CGA58）
