NIitrogen cycling in Coral reef organisms under Environmental change - NICE

环境变化下珊瑚礁生物中的氮循环 - NICE

• 批准号: 289886986
• 负责人: Professor Dr. Christian Wild
• 金额: --
• 依托单位: Arbeitsgruppe Marine Ökologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/289886986?language=en
• 关键词: NIitrogen; cycling; Coral; reef; organisms

Nitrogen (N) is one of the limiting nutrients in highly productive coral reef environments and thus plays a key role in the metabolism of reef organisms and the functioning of their ecosystems. Recent research revealed that microbe-mediated dinitrogen (N2) fixation is ubiquitous in coral reefs, and that active N2-fixing prokaryotes (diazotrophs) are associated with many different reef organisms. These diazotrophs may form characteristic associations with scleractinian corals, the key reef ecosystem engineers. However, the interplay of N2 fixation with other key processes of the marine N cycle, i.e. nitrification and denitrification, and the susceptibility of all these processes to key environmental disturbances (e.g. warming and nutrient enrichment) has not yet been investigated in coral reefs. Such processes are very likely important features of microbial N cycling in reef organisms, particularly hard corals, which can allow them to adapt to environmental changes in their fragile and important ecosystems. N2 fixation in corals appears to be essential for overcoming N starvation in oligotrophic reef environments. At the same time, in the presence of nutrient enrichment caused by human activities, both nitrification and denitrification may be important processes for maintaining the symbiotic algae (Symbiodinium) growth-limited in the coral host. In this context, expected increases in sea surface temperature resulting from global warming can potentially alter microbial N cycling in corals and other reef organisms. Ultimately, an imbalance between N gains and losses may impact the delicate equilibrium that regulates coral symbiosis, resulting in the onset of bleaching. The state of knowledge suggests that a disturbance of microbial N cycling via ocean warming and dissolved organic carbon (DOC) eutrophication may be involved in coral bleaching. The proposed project NICE (NItrogen Cycling in Coral Reef organisms under Environmental change), using a series of interconnected descriptive and experimental studies at the central Red Sea, will thus quantify all major processes and identify associated microbial players of the N cycle in hard corals and other common reef organisms including soft corals and algae. An interdisciplinary approach combining expertize from coral physiology, molecular microbial ecology, biogeochemistry, and reef ecology will allow testing the hypotheses mentioned above. Importantly, a range of global and local environmental disturbances (increased temperature, and inorganic as well as organic eutrophication) will be simulated to understand N cycle responses. NICE thereby will provide novel and fundamental knowledge of N cycling in coral reef organisms in comparison. The results generated by this project will effectively contribute to a better science-based management of coral reefs.

氮(N)是高生产力珊瑚礁环境中的限制性营养物质之一，因此在珊瑚礁生物的新陈代谢及其生态系统的功能中起着关键作用。最近的研究表明，微生物介导的氮素固定在珊瑚礁中普遍存在，活跃的固氮原核生物(重氮菌)与许多不同的珊瑚礁生物有关。这些重氮菌可能与关键的珊瑚礁生态系统工程师--硬珊瑚形成特征联系。然而，在珊瑚礁中，氮的固定与海洋氮循环的其他关键过程，即硝化和反硝化的相互作用，以及所有这些过程对关键环境干扰(例如，变暖和营养丰富)的敏感性尚未被调查。这种过程很可能是珊瑚礁生物，特别是硬珊瑚中微生物N循环的重要特征，使它们能够适应其脆弱和重要的生态系统中的环境变化。珊瑚对氮气的固定对于克服贫养珊瑚礁环境中的氮素饥饿至关重要。同时，在人类活动引起的营养丰富的情况下，硝化和反硝化作用可能是维持共生藻类(共生藻)在珊瑚宿主中有限生长的重要过程。在这方面，全球变暖导致的预期海洋表面温度上升可能会改变珊瑚和其他珊瑚礁生物中的微生物氮循环。最终，氮的得失之间的不平衡可能会影响调节珊瑚共生的微妙平衡，导致漂白的开始。目前的知识状况表明，通过海洋变暖和溶解有机碳(DOC)富营养化而扰乱微生物N循环可能参与了珊瑚漂白。因此，拟议的项目NICE(环境变化下珊瑚礁生物的氮循环)利用红海中部一系列相互关联的描述性和实验研究，将量化所有主要过程，并确定硬珊瑚和包括软珊瑚和藻类在内的其他常见珊瑚礁生物中氮循环的相关微生物角色。结合来自珊瑚生理学、分子微生物生态学、生物地球化学和珊瑚礁生态学的专家的跨学科方法将允许检验上述假设。重要的是，将模拟一系列全球和局部环境扰动(气温升高，以及无机和有机富营养化)，以了解N循环的反应。因此，NICE将为珊瑚礁生物的氮循环提供新的和基础的知识。该项目产生的成果将有效地有助于更好地对珊瑚礁进行科学管理。

项目成果

Seasonality affects dinitrogen fixation associated with two common macroalgae from a coral reef in the northern Red Sea

季节性影响与红海北部珊瑚礁中两种常见大型藻类相关的二氮固定

• DOI: 10.3354/meps12206
• 发表时间: 2017
• 期刊: Marine Ecology Progress Series
• 影响因子: 2.5
• 作者: Tilstra A;Bednarz VN;Cardini U;van Hoytema N;Al-Rshaidat MMD;Wild C
• 通讯作者: Wild C

Simultaneous Measurements of Dinitrogen Fixation and Denitrification Associated With Coral Reef Substrates: Advantages and Limitations of a Combined Acetylene Assay

同时测量与珊瑚礁基质相关的二氮固定和反硝化：联合乙炔测定的优点和局限性

• DOI: 10.3389/fmars.2020.00411
• 发表时间: 2020
• 作者: El-Khaled YC;Roth F;Rädecker N;Kharbatia N;Jones BH;Voolstra CR;Wild C
• 通讯作者: Wild C

Relative Diazotroph Abundance in Symbiotic Red Sea Corals Decreases With Water Depth

共生红海珊瑚的相对固氮生物丰度随着水深的增加而减少

• DOI: 10.3389/fmars.2019.00372
• 发表时间: 2019
• 期刊: Frontiers in Marine Science
• 影响因子: 3.7
• 作者: Tilstra A;Pogoreutz C;Rädecker N;Ziegler M;Wild C;Voolstra CR
• 通讯作者: Voolstra CR

Denitrification Aligns with N2 Fixation in Red Sea Corals

• DOI: 10.1038/s41598-019-55408-z
• 发表时间: 2019-12
• 期刊: Scientific Reports
• 影响因子: 4.6
• 作者: A. Tilstra;Y. El-Khaled;F. Roth;Nils Rädecker;C. Pogoreutz;C. Voolstra;C. Wild

Sugar enrichment provides evidence for a role of nitrogen fixation in coral bleaching

• DOI: 10.1111/gcb.13695
• 发表时间: 2017-09-01
• 期刊: GLOBAL CHANGE BIOLOGY
• 影响因子: 11.6
• 作者: Pogoreutz, Claudia;Raedecker, Nils;Wild, Christian
• 通讯作者: Wild, Christian