Roles of Bioactive Trace Metals and Trace Metal Chelators with Respect to Oceanic Phytoplankton Productivity in the Central Equatorial Pacific and Western North Pacific

这个项目将测试几个假设有关的控制 海洋初级生产力（主要是浮游植物） 通过改变溶解的痕量金属的量 生长所需的元素（Fe、Mn和Zn）以及可能 有毒，而且经常也存在（铜和钴）。 在自然界中， 这些金属与天然金属络合的程度 存在的有机化合物可以控制它们的可用性， 浮游植物 这项研究将调查几个 海洋中未充分利用溶解的 硝酸盐和磷酸盐，也许是因为缺乏 需要微量金属或过量的有毒微量金属。 的 要做的实验将涉及：1）确定 溶解的痕量金属浓度与深度的关系 多个站点，以及2）在每个站点改变量 微量元素Fe、Mn、Zn、Cu、Co的有效性 活的浮游植物培养物。 第二组的结果 将与浮游植物的生长进行比较 实验中没有添加额外的金属 为了量化不同可用性的大小， 微量金属

This project will test several hypotheses regarding the control of oceanic primary productivity (primarily phytoplankton productivity) by varying the amounts of dissolved trace metals needed for growth (Fe, Mn and Zn) and also those which may be toxic and are often also present (Cu and Co). In nature the extent to which these metals are complexed by naturally occurring organic compounds may control their availability to the phytoplankton. This research will investigate several areas of the ocean which are underutilizing the dissolved nutrients nitrate and phosphate, perhaps because of lack of needed trace metals or excess of toxic trace metals. The experiments to be done will involve: 1) determining the concentrations of dissolved trace metals versus depth at several stations, and 2) at each station varying the amounts and availabilities of the trace metals Fe, Mn, Zn, Cu and Co in living phytoplankton cultures. The results of the second set of experiments will be compared with phytoplankton growth experiments wherein no additional metals have been added in order to quantify the magnitude of varying availabilities of the trace metals.