Planning Visit: U.S.-Danish Research on Diversity and Toxin Production of Pseudo-nitzschia Species in Sub-Arctic and Arctic Regions with Focus on Iron Enriched Regions.

计划访问：美国-丹麦对亚北极和北极地区拟菱形藻物种多样性和毒素产生的研究，重点关注富铁地区。

• 批准号: 0922684
• 负责人: Sibel Bargu Ates
• 金额: $ 0.94万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-05-01 至 2010-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0922684&HistoricalAwards=false
• 关键词: Planning; Visit; U.S.; Danish; Research

OISE 0922684BarguRelatively little is know about the distribution of marine diatom, Pseudo-nitzschia, in offshore, oceanic environments and corresponding ecosystem-wide consequences associated with the diatom?s potential production of the toxic Domoic Acid (DA). Though this research planning visit, Sibel Bargu and a graduate student from Louisiana State University and A & M College will initiate a collaborative project with Danish partner, Nina Lundholm at the University of Copenhagen. They intend to study diversity and toxin production of the Pseudo-nitzschia species in sub-Arctic and Arctic regions with a particular focus on iron enriched regions. Accurate species identification and molecular studies of this source organism are needed to further evaluate the ecology and toxin production of the taxa. The U.S. principal investigator?s strengths in ecological measurements of DA in iron rich waters, seaward of continental margins, complement the Danish partner?s extensive knowledge of systematics and molecular biology in Artic and sub-Arctic locations. Together the international team will begin work to confirm the ultimate identity of the Pseudo-nitzschia species by using electron microscopy and genomic analysis. Their efforts are expected to begin to reveal more about the production and transfer of DA through food chains in places like the Gulf of Alaska and Greenlandic waters, with the long-term goal of documenting Pseudo-nitzschia distribution and toxicity in world oceans. This research visit fulfills the program objective of advancing basic knowledge of this genius and the relative toxicity of strains by enabling experts in the United States and Europe to share research resources and plan beneficial projects in areas of strong mutual interest and competence. Broader impacts include providing one Louisiana State University graduate student with an early career introduction to forefront international collaboration and field work. Based on previous observations, team members conclude that iron enrichment may selectively promote growth of the toxin producing strains. Therefore, new results could identify potential DA hazards that should be considered in iron fertilization experiments designed to remove carbon dioxide from the atmosphere through sequestration in deep oceans.

人们对海洋硅藻（伪硅藻）在近海和海洋环境中的分布以及与硅藻相关的相应生态系统后果知之甚少。可能产生有毒的软骨藻酸（DA）。通过这次研究计划访问，Sibel Bargu和一名来自路易斯安那州立大学和a &amp； M学院的研究生将与哥本哈根大学的丹麦合作伙伴Nina Lundholm启动一个合作项目。他们打算研究亚北极和北极地区伪nitzschia物种的多样性和毒素产生，特别关注富铁地区。为了进一步评估该分类群的生态和毒素产生，需要对该源生物进行准确的物种鉴定和分子研究。美国首席研究员？中国在富铁水域、大陆边缘向海的生态测量方面的优势，与丹麦合作伙伴？他对北极和亚北极地区的系统学和分子生物学有广泛的了解。国际团队将一起开始工作，通过使用电子显微镜和基因组分析来确认伪尼齐亚物种的最终身份。他们的努力有望开始揭示更多关于在阿拉斯加湾和格陵兰水域等地通过食物链产生和转移DA的信息，其长期目标是记录伪尼茨氏菌在世界海洋中的分布和毒性。这次研究访问实现了该计划的目标，即通过使美国和欧洲的专家能够在共同感兴趣和能力强的领域共享研究资源和规划有益的项目，从而提高对这一天才和菌株相对毒性的基本认识。更广泛的影响包括为路易斯安那州立大学的一名研究生提供早期职业生涯介绍，了解最前沿的国际合作和实地工作。基于先前的观察，团队成员得出结论，铁富集可能选择性地促进毒素产生菌株的生长。因此，新的结果可以确定铁施肥实验中应该考虑的潜在DA危害，铁施肥实验旨在通过深海封存从大气中去除二氧化碳。