海洋地质与第四纪地质2025，Vol.45Issue(6)：117-128,12.DOI:10.16562/j.cnki.0256-1492.2025021001
海马冷泉硫营养型宏生物的营养策略及意义
Nutritional strategies and significance of sulfur-nutrition seep-dwelling invertebrates in the Haima Cold Seep
摘要
Abstract
Cold-seep bivalves obtain nutrients through symbiosis with chemosynthetic bacteria,and the biomarkers and stable carbon isotopic composition of their soft tissues can reveal their carbon sources,nutritional strategies,and symbiotic relationships with bacteria.Information derived from lipid biomarkers in modern cold-seep bivalves and their symbiotic bacteria is crucial for interpreting data from the rock record,as most biological methods are not applicable in such contexts.We applied lipid biomarkers and compound-specific stable carbon isotopic compositions to investigate the carbon assimilation pathways,nutritional status,and host-symbiont relationships of three cold-seep bivalves in the South China Sea,and focused on Acharax sp.,Bathymodiolus aduloides,and Archivesica marissinica collected from the Haima cold seep,and analyzed the carbon isotopes and biomarkers in their soft tissues.Results show that the gills and feet of all the three cold-seep bivalve species contained significant amounts of saturated fatty acids,mono/polyunsaturated fatty acids(MUFAs/PUFAs),fatty alcohols,and sterols.Among them,the gill tissues exhibited much higher concentrations of C16:1ω7,C18:1ω7,and C18:1ω9 compared to those in the feet,and the δ13C values were-35.2‰～-30.8‰ for Acharax sp.,-46.2‰～-45.7‰ for B.aduloides,and-42.9‰～-31.0‰ for A.marissinica.The soft tissues of these three cold-seep bivalves lack ω8 fatty acids and 4-methyl sterols,indicating that Acharax sp.,B.aduloides,and A.marissinica rely on symbiosis with sulfur-oxidizing bacteria for nutrition.Additionally,the biomarkers in the feet of cold-seep bivalves and the animal-synthesized polyunsaturated fatty acid(C20:2)exhibited δ13C values(-44.5‰ to-35.3‰)similar to those of symbiotic bacterial fatty acids,suggesting that the host's nutrition was derived mainly from its symbiotic bacteria or that the majority of its carbon was acquired through this pathway.This study provided critical insights into the carbon utilization and symbiotic mechanisms of different cold-seep macrofauna.关键词
南海冷泉/化能合成/共生/脂质生物标志化合物/稳定碳同位素Key words
South China Sea Cold Seep/chemosynthesis/symbiosis/lipid biomarkers/compound-specific carbon isotopes分类
海洋科学引用本文复制引用
ZHANG Yi,WANG Nan,GUAN Hongxiang..海马冷泉硫营养型宏生物的营养策略及意义[J].海洋地质与第四纪地质,2025,45(6):117-128,12.基金项目
国家自然科学基金"冷泉系统甲烷消耗过程的氢利用及其生物地球化学记录"(42276053) （42276053）
崂山实验室科技创新"极端环境系统的流体迁移转换过程"(LSKJ202203502) （LSKJ202203502）
泰山学者青年专家"冷泉沉积地球化学"(tsqn202211069) （tsqn202211069）
中央高校基本科研业务费专项(202172002) （202172002）
