Metal Speciation and Cyanolbacterial Ecology in the Sargasso Sea

马尾藻海的金属形态和蓝藻生态学

基本信息

批准号：
9701681
负责人：
Sallie Chisholm
金额：
$ 21.1万
依托单位：
Massachusetts Institute of Technology
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1997
资助国家：
美国
起止时间：
1997-03-01 至 2001-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9701681&HistoricalAwards=false
关键词：
Metal Speciation Cyanolbacterial Ecology Sargasso

项目摘要

ABSTRACT OCE-9618729 / OCE-9701681 Chemical oceanographers and marine microbiologists have known for some time now that trace metals in seawater affect ocean phytoplankton and bacteria differently depending upon the concentrations actual chemical forms, or species, in which the trace metal is present. Similarly, it is also known that such organisms are capable of secreting complexating agents that change trace metal speciation, making them more or less assimilable and more or less toxic. It is known that the very low concentrations at which trace metals are present in surface waters of the central ocean gyres may limit biological production, as has been demonstrated recently for iron. In this project, investigators from the Woods Hole Oceanographic Institution and the Massachusetts Institute of Technology will study these phenomena as a two-way street: water column trace metals affecting oceanic microbial communities and oceanic microbial communities affecting the water column trace metal chemistry. The studies will involve field (Sargasso Sea) and laboratory studies with two species of cyanobacteria and their biogeochemical relationship with cobalt, iron, and copper in the water column. The primary emphasis will be on cobalt because of its importance as a micronutrient and because so little is know about its chemical speciation in the oceanic environment.

摘要OCE-9618729 / OCE-9701681化学海洋学家和海洋微生物学家已经知道了一段时间，现在海水中的痕量金属影响海洋浮游植物和细菌，根据浓度的实际化学形式或物种的浓度不同，其中存在痕量金属。同样，众所周知，这种生物能够分泌改变痕量金属物种形成的络合剂，使其或多或少地同化和或多或少有毒。众所周知，在中央海洋回旋的地表水中存在痕量金属的非常低的浓度可能会限制生物产生，这是铁的最近证明的。在该项目中，来自伍兹洞海洋学机构和马萨诸塞州理工学院的研究人员将研究这些现象是一条双向街道：水柱跟踪影响海洋微生物群落和海洋微生物群落，影响水柱痕量金属化学。这些研究将涉及田间（Sargasso Sea）和实验室研究，其中两种蓝细菌及其与钴，铁和铜在水柱中的生物地球化学关系。主要的重点将放在钴上，因为它作为一种微量营养素的重要性，并且由于对海洋环境中的化学物种形象知之甚少。