Is Nitrogen Nitrogen? Ecosystem Impacts of Anthropogenic N Sources on Algal Blooms, Hypoxia, and Biogeochemical Cycling in the Neuse River Estuary, NC

[00:15 . 49]保罗：氮氮？人为氮源对纽斯河河口藻华、缺氧和生物地球化学循环的影响，ncn (N)限制是全球河口的共同特征。新河河口流域前所未有的城市、农业和工业增长造成的人为氮负荷过高，导致初级生产（富营养化）加速，包括有害的藻华。藻华会产生大量的有机物，从而导致过度的氧气消耗。这种情况，缺氧，减少栖息地，导致疾病，使鱼类和贝类窒息，破坏生态系统功能。全国范围内缺氧的扩大是首要问题。在将氮输入与生态系统结构和功能联系起来时，通常假设“氮就是氮”。我们假设不同的藻类群体对不同的人为无机氮和有机氮来源的利用不同，导致了不同的藻华响应、食物网的改变、氧气的消耗、水质和栖息地的变化。天然藻类群落对特定N化合物的响应及其对河口功能改变（如缺氧和养分循环）的影响是本研究的重点。

98-15495PaerlIs nitrogen nitrogen? Ecosystem impacts of anthropogenic N sources on algal blooms, hypoxia, and biogeochemical cycling in the Neuse River estuary, NCNitrogen (N) limitation is a common feature of estuaries worldwide. Excessive man-made N loading from unprecedented urban, agricultural and industrial growth in the Neuse River estuary watershed has led to accelerating primary production (eutrophication), including harmful algal blooms. Blooms produce large amounts of organic matter, which fuels excessive oxygen consumption. This condition, hypoxia, reduces habitats, causes disease, suffocates fish and shellfish and disrupts ecosystem function. National expansion of hypoxia is of prime concern. "Nitrogen is nitrogen" is commonly assumed when relating N inputs to ecosystem structure and function. We hypothesize that diverse algal groups use various anthropogenic inorganic and organic N sources differentially, leading to distinct algal bloom responses, food web alteration, oxygen depletion, water quality and habitat changes in the estuary. The responses of natural algal communities to specific N compounds and their impacts on altered estuarine function (e.g., hypoxia and nurient cycling) is the focus of this research.