U.S.-Brazil Cooperative Study of Microbial Nitrogen Cycling in Brazilian Coastal Waters

9314610 Glibert这个美国-巴西合作科学奖将支持马里兰州大学的Patricia Glibert和Patricia Metzler博士的合作。巴西圣保罗大学的学生。 该项目旨在测量巴西沿海的浮游氮转化。 氮营养盐在海洋初级生产中的重要性早已被认识到。 它们的再生是海洋初级生产者氮的主要来源，但最终决定生产量的是“新”氮的供应速度。 事实上，对南大西洋西部的氮转化率没有直接的测量。 在这个项目中，研究人员将应用15 N稳定同位素示踪技术来研究巴西沿海和近海沃茨对氮通量的生理和营养动力学反应。 实验将阐明浮游生物对新氮输入的大小和时间依赖性反应之间的关系，以及对新氮与再生氮的依赖性。 这些研究将使双方受益，为世界海洋采样不足的部分提供数据，在巴西建立一个新的研究领域，并为一名巴西学生提供这些实验方法方面的培训。 ***

9314610 Glibert This US-Brazil Cooperative Science award will support the collaboration of Patricia Glibert of the University of Maryland and Patricia Metzler, a Ph.D. student at the University of Sao Paulo, Brazil. The project aims to measure planktonic nitrogen transformations off the coast of Brazil. The importance of nitrogenous nutrients in marine primary production has long been recognized. Their regeneration is known to be a major source of nitrogen for oceanic primary producers, but it is the rate of supply of "new" nitrogen which ultimately determines the amount of production. There have been virtually no direct measurements of the rates of nitrogen transformation in the western South Atlantic. In this project, the researchers will apply 15N stable isotope tracer techniques to investigate physiological and trophodynamic responses to nitrogen fluxes in Brazil's coastal and offshore waters. The experiments will elucidate the relationship between size- and time-dependent responses by plankton to new nitrogen inputs and the dependence on new versus regenerated nitrogen. These studies will benefit both sides by producing data for an undersampled part of the world's oceans, establishing a new area of research in Brazil, and training a Brazilian student in methodology for these experiments. ***