Fate of Metals Associated with Marine Biogenic Debris

与海洋生物碎片相关的金属的命运

• 批准号: 8810657
• 负责人: Nicholas Fisher
• 金额: $ 39.76万
• 依托单位: SUNY at Albany
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-11-01 至 1992-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8810657&HistoricalAwards=false
• 关键词: Fate; Metals; Associated; Marine; Biogenic

The flux of biogenic debris has often been implicated as major vector in the vertical transport of metals in aquatic systems. However, efforts to model quantitatively these processes have been limited by an inadequate data base on the retention times of most metals in biogenic debris particularly under different conditions of microbial decomposition. This study includes a series of radiotracer experiments in which the retention times of thirteen metals will be measured in phytoplankton, copepods, appendicularians, and chaetognaths as well as zooplankton fecal pellets, crustacean molts, and larvacean houses under different condition of microbial degradation. Metal biokinetics and pathways in organisms will be studied for metals accumulated from dissolved and ingested sources. Metal compartmentalization in phytoplankton will be assessed to help understand the fate of ingested in herbivores. A simple model to quantify the roles that different forms of biogenic debris can play in mediating the flux of metals will be constructed and tested off the NE US coast. Decomposition of biogenic debris and metal flux in individual types of debris will be measured in material caught in sediment traps deployed for the SEEP program. Metal analyses will employ the X-ray microprobe facility of the National Synchrotron Light Source.

生物碎屑的流动往往被认为是主要的 水生系统中金属垂直运输的媒介。 然而，对这些过程进行定量建模的努力， 由于保留时间数据库不足， 生物碎屑中的大多数金属，特别是在不同的 微生物分解的条件。 本研究包括 一系列放射性示踪剂实验中， 13种金属将在浮游植物，桡足类， 浮游动物、毛颚类以及粪便中的浮游动物 颗粒，甲壳动物蜕皮，和幼虫的房子下不同的 微生物降解条件 金属生物催化剂和 生物体中的途径将被研究的金属积累， 溶解和摄入的来源。 金属区室化 将对浮游植物进行评估，以帮助了解 在食草动物体内摄入。 一个简单的模型来量化角色 不同形式的生物碎片可以在调解 将在美国东北部建造和测试金属通量 海岸 生物碎屑的分解和金属通量 各种类型的碎片将在捕获的材料中进行测量， 为SEEP计划部署的沉积物收集器。 金属分析 将采用国家科学院的X射线微探针设备， 同步加速器光源