The Seagrass History of Florida Bay Reconstructed from Integrating Micropaleontological and Geochemical Proxies

通过整合微古生物学和地球化学代理重建佛罗里达湾的海草历史

• 批准号: 0126024
• 负责人: Laurel Collins
• 金额: $ 15.43万
• 依托单位: Florida International University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0126024&HistoricalAwards=false
• 关键词: Seagrass; History; Florida; Bay; Reconstructed

ABSTRACTThe Seagrass History of Florida Bay Reconstructed from Integrating Micropaleontological and Geochemical ProxiesLaurel S. Collins, Rudolf Jaffe, James W. Fourqurean, William T. AndersonFlorida International UniversityHow much of the variation in coastal environmental conditions is naturally occurring and how much has been caused by humans? This question is addressed with the historical record of seagrass abundance, which today is highly correlated with environmental water quality. The study is set in Florida Bay, part of the environmentally challenged Everglades National Park. The main objective is to collect cores of Florida Bay sediment and use proxies of seagrass abundance contained therein as indicators of the environmental water quality for the past few hundred years. Proxies are used because seagrass itself is not preserved in sediments. The geochemical proxies are measures of organic matter (organic carbon, nitrogen, molecular biomarkers, stable isotopes - d13C, d15N, dD) and micropaleontological proxies are abundances of seagrass indicator species (foraminifera, diatoms). Hypersalinity has recently been linked to large seagrass die-offs in Florida Bay. Several proxies will also be used to determine the correlation between historical salinity and seagrass changes. This grant funds the pilot project to extract sediment cores from Florida Bay, conduct sedimentologic analyses, determine radiometric ages, and calibrate the proxies to modern seagrass abundances and salinities. The investigators will subsequently collect geochemical and micropaleontological data from the cores, integrate the data in statistical analyses, and interpret the results. Knowledge is advanced by incorporating the results in geology, biology and chemistry classes taught by the investigators, and providing the basis for three graduate student theses. FIU is a federally recognized minority university.

摘要佛罗里达湾的海草历史从整合微生物学和地球化学副群岛S. Collins，Rudolf Jaffe，James W. Fourqurean，William T. Andersonflorida国际大学中，沿海环境条件的许多差异是自然发生的，是人类造成了多少差异？ 这个问题的历史记录是海草丰度的历史记录，如今，这与环境水质高度相关。该研究设置在佛罗里达湾，这是面临环境挑战的大沼泽国家公园的一部分。 主要目的是收集佛罗里达湾沉积物的核心，并使用其中包含的海草丰度代理作为过去几百年来环境水质的指标。使用代理是因为海草本身未保存在沉积物中。地球化学代理是有机物的度量（有机碳，氮，分子生物标志物，稳定同位素-D13C，D15N，DD）和微石材内生物学的代理是大量的海草指示剂（有孔氨基菌，diotoms，diotoms）。高盐度最近与佛罗里达湾的大型海草死亡有关。 还将使用几个代理来确定历史盐度与海草变化之间的相关性。这项赠款为试点项目提供资金，以从佛罗里达湾提取沉积物核心，进行沉积学分析，确定辐射年龄，并校准现代海草丰度和盐分的代理。研究人员随后将从核心收集地球化学和微生物遗迹数据，将数据整合到统计分析中并解释结果。通过纳入调查人员教授的地质，生物学和化学类别的结果，并为三个研究生论文提供基础来提高知识。 FIU是一所联邦认可的少数民族大学。