Collaborative Research: Culturing Studies of Environmental Controls on Benthic Foraminiferal Shell Chemistry

合作研究：底栖有孔虫壳化学环境控制的培养研究

• 批准号: 0350794
• 负责人: Daniel McCorkle
• 金额: $ 20.86万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-11-01 至 2007-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0350794&HistoricalAwards=false
• 关键词: Collaborative; Research; Culturing; Studies; Environmental

AbstractUnder this award the PIs will culture foraminifera that reproduce and calcify and can be maintained under tightly constrained carbonate chemistry and trace element concentrations to determine environmental and physiological ("vital") influences on the shell chemistry of benthic foraminifera. Two culturing studies, will take about one year each. These are designed to address key aspects of the controls on benthic foraminiferal shell chemistry. In each year both B. aculeata from a 220-m site and also epibenthic species (e.g., Cibicidoides) from deeper-water sites will be cultured. Year 1 experiments will pursue results from work to date, and from previous culturing studies of planktic foraminifera, by investigating the influence of carbonate ion concentration on shell composition (d13C, d18O, Cd, Ba, Mg, Sr, U, V). Year 2 experiments will document the response of benthic foraminiferal trace element composition to variations in dissolved trace metal concentrations, and the response of benthic foraminiferal carbon isotopic composition to the d13C of their algal food. Substantial culturing effort (~25% of the facility and time) will be devoted in both years to exploratory studies on temperature influence on foraminiferal shell chemistry (in particular, Mg/Ca), designed to help define problems and approaches most suitable for future culture work. In addition to these culturing studies, related field-based studies of in situ foraminiferal life positions and shell composition will also be conducted. The project will benefit society at large because results will enable better paleoceanographic interpretations of past climate changes. Accurate assessments of past climate variability are necessary for confident predictions about future climate change. Such predictions, in turn, provide an essential foundation for sound policy decisions regarding anthropogenic release of CO2 and other greenhouse gases.

【摘要】在该奖项下，pi将培养繁殖和钙化的有孔虫，并能在严格限制的碳酸盐化学和微量元素浓度下维持，以确定环境和生理（“重要”）对底栖有孔虫外壳化学的影响。两次培养研究，每次大约需要一年的时间。这些设计是为了解决底栖有孔虫壳化学控制的关键方面。每年都会在220米的地点培养棘叶双歧杆菌，也会在深水地点培养表底栖物种（如Cibicidoides）。第一年的实验将通过研究碳酸盐离子浓度对贝壳组成（d13C, d18O, Cd, Ba, Mg, Sr， U， V）的影响，继续研究迄今为止的工作成果，以及以前浮游有孔虫的培养研究结果。第二年的实验将记录底栖有孔虫微量元素组成对溶解微量金属浓度变化的响应，以及底栖有孔虫碳同位素组成对藻类食物d13C的响应。在这两年中，大量的培养工作（约25%的设施和时间）将用于温度对有孔虫壳化学（特别是Mg/Ca）的影响的探索性研究，旨在帮助确定最适合未来培养工作的问题和方法。除了这些培养研究外，还将进行有关现场有孔虫生活位置和壳组成的实地研究。该项目将使整个社会受益，因为其结果将使对过去气候变化的古海洋学解释变得更好。对过去气候变率的准确评估对于自信地预测未来气候变化是必要的。这种预测反过来又为有关人为排放二氧化碳和其他温室气体的合理决策提供了必要的基础。