U.S.-Mexico Dissertation Enhancement: Understanding Land-Sea Biogeochemistry at Multiple Scales - Interactions at the Interface of Mexico's Yaqui Valley and the Gulf of California

作者：Matson，Pamela A.本论文增强建议，将支持博士的监督下，迈克尔贝曼先生的论文研究。斯坦福大学的马特森，并与蒙特雷研究所自然资源保护中心的埃斯特·克鲁兹博士合作。拟议的研究将研究墨西哥亚基山谷农业径流对加州湾沿海系统的影响。农业径流可对海湾开放沃茨的浮游植物生物量产生大规模影响。 主要根据卫星遥感数据，有人认为，沿海的营养物质涌上，加上农业来源的营养物质，导致大型浮游植物水华和羽流，规模可达近50公里。 这些结果进一步表明，亚基河谷的河口是重要的，可能是非常独特的地球化学变化的网站。 拟议的研究集中在一个较小的空间尺度，旨在了解微生物群落结构和功能，在这些河口之一，巴伊亚德尔托巴里。 这项工作将采用遗传技术，沉积物操作和原位生物地球化学测量相结合的方法，以了解Tobari的氮转化和损失，以及这些过程如何与海湾的工作过程联系起来。 作为一个高度连接的陆地-海洋系统，正在经历快速变化，亚基河谷-加州湾是理解全球海岸变化加速的模型系统。

0438396Matson, Pamela A. This dissertation enhancement proposal, will support the dissertation research of Mr. Michael Beman under the supervision of Dr. Pamela A. Matson of Stanford University, and in collaboration with Dr.Esther Cruz at the Centro de Conservacion para el Aprovechamiento de los Recursos Naturales (CECARENA) of the Instituto Tecnologico de Estudios Superiores de Monterrey (ITESM). The proposed research will study the effects of agricultural runoff from the Yaqui Valley of Mexico on the coastal systems in the Gulf of California. Agricultural runoff can have large-scale influences on phytoplankton biomass in the open waters of the Gulf. Based primarily on data from satellite remote sensing, it is argued that coastal upwelling of nutrients, augmented by agriculturally-derived nutrients, results in large phytoplankton blooms and plumes that can reach almost 50 km in scale. These results further imply that the estuaries of the Yaqui Valley are sites of important and possibly quite unique biogeochemical transformations. The proposed research is focused on a smaller spatial scale, and aimed at understanding microbial community structure and function in one of these estuaries, Bahia del Tobari. The work will employ a combination of genetic techniques, sediment manipulations, and in situ biogeochemical measurements to understand nitrogen transformations and losses from Tobari, and how these processes are linked with processes at work in the Gulf. As a highly connected land-sea system undergoing rapid change, the Yaqui Valley-Gulf of California represents a model system for understanding the acceleration of coastal change worldwide.