570 Marine Microbial Interactions

Marine Oxygen Deficient Zones (ODZs), defined as containing <10nM oxygen, are naturally occurring regions of the ocean where mid-layer oxygen poor waters are sandwiched between oxygenated surface and deep layers.  In a future warmer ocean, decreasing oxygen solubility is predicted to increase the size of both naturally ocurring ODZs, and of seasonally hypoxic waters, with implications for increasing N2 production and further N limitation of global primary production. In these waters marine microbes employ other terminal electron acceptors, including oxidized nitrogen (nitrate and nitrite), sulfur, arsenic and other compounds, resulting in the production of both N2 and the greenhouse gas N2O.   Together, in seminar-discussion mode, we will explore physical, chemical and biological aspects of marine ODZs.  Each student will prepare a written annotated bibliography on their topic, assign a key paper for all to read in advance, give a class presentation on the topic, and lead a discussion of it and the assigned paper.  The goal is to emerge with a current understanding of major processes in low oxygen marine waters, complete with a set of annotated references on key topics.