The Distribution and Dynamics of Bioactive Metals Within the Marine Colloidal Phase

已知海洋中浮游植物的生产在某些情况下受到它们可获得的铁（以及可能的其他微量金属）的量的限制。 并不是每一种微量金属的化学形式都能被这些生物利用。 从生物学角度来看，其中最重要的是铁，它很容易在海水中形成胶体，因此从海洋生态和地球化学角度来看，了解浮游植物如何利用胶体以及铁和其他微量金属如何进入和离开胶体相是很重要的。 在这个项目中，主要调查人员将对加州中部大陆架的沃茨中的铁和其他六种生物活性微量金属进行研究。 使用一种称为错流过滤的相对较新的技术，将检查铁和其他微量金属在溶解相和胶体相中（不同大小的类别）的分布。 特别是铁和其他微量金属在胶体阶段的生物利用度将进行调查，运行船上孵化，也通过原位比较胶体金属分布和浮游生物生产的水柱。

The production of phytoplankton in the ocean is know to be limited under some circumstances by the amount of iron (and perhaps other trace metals) available to them. Not every chemical form of these trace metals can be utilized by these organisms. Since the most important of these from a biological standpoint is iron, which readily forms colloids in seawater, it is important from marine ecological and geochemical perspectives to understand how available colloidal is to the phytoplankton and how iron and other trace metals move into and out of the colloidal phase. In this project, the principal investigators will undertake a study of iron and six other biologically active trace metals in the waters of the continental shelf of central California. Using a relatively new technique called cross-flow filtration, the distribution of iron and the other trace metals in dissolved and colloidal phases (different size classes) will be examined. In particular the biological availability of iron and other trace metals in the colloidal phases will be investigated by running shipboard incubations and also by in situ comparisons of colloid-metal distributions and plankton production in the water column.