BRC-BIO: High nutrient submarine groundwater discharge delivery effects on coastal primary productivity on coral reefs in Maunalua Bay, Hawaii

BRC-BIO：高营养海底地下水排放对夏威夷毛纳鲁亚湾珊瑚礁沿海初级生产力的影响

• 批准号: 2312723
• 负责人: Florybeth La Valle
• 金额: $ 50.09万
• 依托单位: Pepperdine University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-08-01 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2312723&HistoricalAwards=false
• 关键词: BRC; BIO; nutrient; submarine; groundwater

Evaluating the effects of multiple stressors on coastal community dynamics is crucial. In doing so, researchers can understand the resilience of these ecosystems, prepare coastal management for future scenarios, and aid in prioritizing restoration efforts. With at least 52% of the US population living in areas that drain into coastal watersheds, it is imperative for researchers to study the effects of nutrient pollution in coastal systems. Submarine groundwater discharge (SGD) is defined as any and all flow of water from the seabed to the coastal ocean. In areas where the nutrient concentration of coastal groundwater has been substantially increased by changing land use, nutrient loading to coastal waters via SGD has been associated with algae blooms and shifts in the community composition. This research will characterize land-based sources of nutrient pollution and its effects on coral reef productivity and community composition. The results from this research will be shared with state entities. Additionally, the results will aid a non-profit organization focused on restoring the study site in identifying and prioritizing restoration sites. This program will engage up to 10 undergraduates and one post baccalaureate. Peer-reviewed strategies for recruitment and retainment of underrepresented minority students, such as financial incentives and summer-long field-based research, will be used. Maunalua Bay (O‘ahu, HI) has experienced dramatic development and increase in population over the last 100 years. This has affected the water quality in near shore coral reefs. Due to the range of onsite sewage disposal systems density, discrete SGD, and its coral reef habitats, Maunalua Bay is a model system to study land-based effects on water quality and primary production on coral reef communities. The main source of land-based inorganic nutrients in Maunalua Bay is SGD, which delivers both freshwater and inorganic nutrients. This research will use novel methods to characterize SGD delivery to both the water column (drone thermal imagery) and benthos (sensors moored to the reef) of two reefs. The work will also quantify carbon uptake of the main primary producers on algal-dominated reefs. Finally, the productivity of the algae on a reef with SGD and without SGD will be modeled. This work will clarify the magnitude of the effect of SGD on both benthic and water column algal productivity of reefs. More than just understanding the abundance, distribution, and productivity of coastal organisms, the proposed research will get to the physical and chemical mechanisms driving these patterns on a local and regional scale in coral reef ecosystems.This project is cofunded by the Building Research Capacity of New Faculty in Biology Program in the Division of Environmental Biology and the Division of Biological Infrastructure and Biological Oceanography Program in the Division of Ocean Sciences.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

评估多种压力源对沿海社区动态的影响至关重要。通过这样做，研究人员可以了解这些生态系统的韧性，为将来的情况准备沿海管理，并协助确定恢复工作的优先级。至少有52％的美国人口居住在排入沿海流域的地区，研究人员必须研究养分污染对沿海系统的影响。海底地下水（SGD）定义为从海床到沿海海洋的所有水流。在通过改变土地利用来大大增加沿海地下水的养分浓度的地区，通过SGD向沿海水域的养分负载与藻类血液有关，并且社区组成的转移。这项研究将表征基于土地的养分污染来源及其对珊瑚礁生产力和社区成分的影响。这项研究的结果将与国家实体共享。此外，结果将有助于一个非营利组织，致力于恢复研究地点，以识别和优先置换恢复站点。该计划最多将参与10名本科生和一名学士学位。将使用招募和保留人数不足的少数民族学生的招聘和保留策略，例如经济激励措施和基于夏季的现场研究。在过去的100年中，Maunalua湾（O'Ahu，Hi）经历了巨大的发展和人口的增长。这影响了近岸珊瑚礁的水质。由于现场污水处理系统密度，离散SGD及其珊瑚礁栖息地的范围，Maunalua湾是研究基于土地对水质和珊瑚礁社区初级生产的影响的模型系统。 Maunalua湾的陆基无机营养物质的主要来源是SGD，它提供淡水和无机养分。营养。这项研究将使用新颖的方法来表征SGD向水柱（无人机热图像）和两个礁石的底栖生物（传感器）（传感器）的递送。这项工作还将量化主要主要生产商在藻类主导的礁石上的碳吸收。最后，将建模使用SGD和没有SGD的礁石上藻类的生产率。这项工作将阐明SGD对礁石的底栖和水柱藻类生产力的影响。拟议的研究不仅要了解沿海有机体的丰度，分布和生产力，还将以珊瑚礁生态系统的本地和区域规模驱动这些模式的物理和化学机制，该项目由新的教师在生物学生物学和生物学计划中的生物学研究中的生物学研究中的新教师研究能力造成的海洋学研究范围的研究能力，以构建海洋学的划分。 NSF的法定使命，并使用基金会的知识分子优点和更广泛的审查标准来评估，被认为是宝贵的支持。