• 关键词：沉积物  壳长增长率  抗氧化防御系统  金属硫蛋白  肝胰脏  肾脏

• 基金项目：国家自然科学基金项目(No.20677021);吉首大学科研基金项目

• 马陶武
• 吉首大学生物资源与环境科学学院, 吉首 416000

• 周科
• 吉首大学生物资源与环境科学学院, 吉首 416000

• 朱程
• 吉首大学生物资源与环境科学学院, 吉首 416000

• 刘佳
• 吉首大学生物资源与环境科学学院, 吉首 416000

• 王子健
• 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085

• 摘要：沉积物毒性测试是评价水生态系统中沉积物污染生态风险的重要手段.建立合适的毒性测试生物是进行沉积物毒性测试的基本前提.铜锈环棱螺(Bellamya aeruginosa)在我国淡水水体中分布广泛,具有重要的生态价值.本研究将实验室培养的铜锈环棱螺暴露于不同含量的镉加标沉积物中28d,以评价该物种在镉污染沉积物慢性胁迫下生物标志物响应的敏感性.结果表明,除了谷胱甘肽(GSH)相对不敏感外,壳长增长率、肝胰脏超氧化物歧化酶(SOD)和过氧化氢酶(CAT)、以及肝胰脏和肾脏中的金属硫蛋白(MT)均表

• Abstract：Sediment toxicity tests have become an important tool for assessing ecological risks of sediment contamination in aquatic ecosystems. A prerequisite for such tests is to identify satisfactory test species. In China,Bellamya aeruginosa is widely distributed as a dominant community member in aquatic ecosystems. In this study,mature B. aeruginosa were exposed for 28 d to sediments artificially spiked with cadmium (Cd) to evaluate their response sensitivity as biomarkers to the chronic stress of Cd-contaminated sediment. The results showed that the shell length growth rate,superoxide dismutase (SOD),catalase (CAT) and metallothionein (MT),but not glutathione (GSH),were highly sensitive to Cd stress,and hepatopancreatic SOD and CAT were especially sensitive to the chronic stress of low levels of sediment Cd. Additionally,B. aeruginosa was successfully cultured under laboratory conditions and readily handled in the toxicity tests,so this species is recommended as a potential candidate for the assessment of sediment toxicity in China.

• Key words：sediment  shell length growth rate  antioxidant defense system  metallothionein  hepatopancreas  kidney

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