EAPSI: Determining the Effect of Ammonium on Algae and their Physiology in the Waters of the Hangzhou and Taihu Regions of China

EAPSI：确定铵对中国杭州和太湖地区水域藻类及其生理的影响

• 批准号: 1514927
• 负责人: Melanie Jackson
• 金额: $ 0.51万
• 依托单位: Jackson Melanie
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1514927&HistoricalAwards=false
• 关键词: EAPSI; Determining; Effect; Ammonium; Algae

China?s marine and freshwaters are among the most nitrogen polluted in the world. Nitrogen pollution has been linked with severe water quality impairment, ranging from nuisance and toxic algal blooms, oxygen depletion, loss of fisheries, and changes in biodiversity. Although the effect of total nutrient loading has been well explored in terms of promoting the growth of algae (algal blooms), the effects of changing nitrogen forms and proportions on algal community composition and productivity are poorly understood in systems experiencing prolonged nutrient loading. In this study, it is hypothesized that nitrogen in the form of ammonium will favor the development of harmful algal blooms, including cyanobacteria and will reduce primary production, compared to when nitrogen in the form of nitrate is available. This project will involve a series of experiments on natural waters collected from the Hangzhou and Taihu regions of China to assess the physiological response of algae to the addition of changing nitrogen forms. This research involves collaboration with Dr. Mengmeng Tong, well known for her expertise in toxic algal blooms, at Zhejiang University, Ocean College. Eutrophication observed in China is of particular concern, considering nutrient loads are rising and relative nitrogen (N) forms reaching aquatic ecosystems are changing, resulting in increasing reduced (e.g. NH4+) compared to oxidized forms of N (NO3-). Not all algae have the same response to nutrient enrichments, and some algae have preferences for different nutrient forms. Natural samples will be variably enriched with NH4+ and NO3- and will be incubated under natural light and temperature conditions for several days during which phytoplankton community composition, biomass accumulation, and productivity will be tracked. Recognizing that the classic limiting nutrients nitrogen and phosphorus (P) are typically available in excess in these nutrient impacted systems prompts this study to focus specifically on how changing N form in the presence of adequate nutrient supplies alter phytoplankton community composition and physiology. This NSF EAPSI award is funded in collaboration with the Chinese Ministry of Science and Technology.

中国呢？中国的海水和淡水是世界上氮污染最严重的水域之一。 氮污染与严重的水质损害有关，包括有害和有毒的藻类水华、氧气耗尽、渔业损失和生物多样性的变化。 虽然总营养负荷的影响已经很好地探讨了促进藻类生长（藻华），藻类群落组成和生产力的氮的形式和比例的变化的影响知之甚少，在经历长期的营养负荷的系统。 在这项研究中，据推测，氮在铵的形式将有利于有害藻华，包括蓝藻的发展，并会减少初级生产，相比，当氮的硝酸盐的形式是可用的。该项目将涉及对从中国杭州和太湖地区收集的天然沃茨进行一系列实验，以评估藻类对添加变化的氮形态的生理反应。这项研究涉及与浙江大学海洋学院的Menghuang Tong博士的合作，她以有毒藻类水华的专业知识而闻名。在中国观察到的富营养化尤其令人担忧，因为营养负荷正在上升，到达水生生态系统的相对氮（N）形态正在发生变化，导致与氧化态氮（NO3-）相比，还原态氮（如NH 4+）增加。 并非所有的藻类都对营养物富集有相同的反应，有些藻类对不同的营养物形式有偏好。天然样品将被富集NH 4+和NO3-，并将在自然光和温度条件下培养数天，在此期间，浮游植物群落组成，生物量积累和生产力将被跟踪。认识到经典的限制性营养素氮和磷（P）通常在这些营养素影响的系统中过量，促使本研究特别关注如何改变N的形式，在充足的营养供应的存在下改变浮游植物群落组成和生理。NSF EAPSI奖是与中国科技部合作资助的。