Collaborative research: Interdisciplinary approach to understand stable isotopic disequilibrium in benthic foraminifera

合作研究：跨学科方法了解底栖有孔虫稳定同位素不平衡

• 批准号: 0550401
• 负责人: Anthony Rathburn
• 金额: --
• 依托单位: Indiana State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-02-01 至 2010-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0550401&HistoricalAwards=false
• 关键词: Collaborative; research; Interdisciplinary; approach; understand; Collaborative; research; Interdisciplinary; approach; understand

Under this award the PIs will examine environments with "extreme" chemical gradients that accentuate chemical differences between biogenic carbonate and ambient conditions as well as those of "normal" deep-sea conditions. Extreme isotopic gradients present at cold methane seeps provide an ideal habitat to examine the effects of carbon isotopic disequilibrium (up to 40 0/00), between foraminiferal calcite and dissolved inorganic carbon (DIC) of ambient water. Recent work suggests that biological factors ("vital effects") and/or ambient isotopic compositions influence carbon isotopic signatures of foraminiferal calcite. Consequently, the proposed work will test the following hypotheses: 1) Infaunal foraminifera cluster in microhabitats within the sediments; 2) Food type influences foraminiferal carbon isotope values; 3) The presence of symbionts is variable within and between species, and this variability is reflected in carbon isotopic signatures. The work should provide insight to the important question of what controls the carbon isotopic composition of benthic foraminiferal tests (shells)? Answers to this question will be crucial for paleoenvironmental reconstructions in both seep and non-seep environments. The funds will also be used to include community outreach (local school presentations; web site development) and interdisciplinary, hands-on training of several future scientists at undergraduate, graduate, and post-doc levels, including under-represented groups.

根据该奖项，PI将检查具有“极端”化学梯度的环境，这些环境强调了生物碳酸盐和环境条件之间的化学差异以及“正常”深海条件的环境。 在冷甲烷渗漏处存在的极端同位素梯度提供了一个理想的栖息地，以检查碳同位素不平衡的影响（高达40 0/00），在有孔虫方解石和溶解的无机碳（DIC）之间。最近的工作表明，生物学因素（“重要效应”）和/或环境同位素组成会影响有孔虫方解石的碳同位素特征。因此，拟议的工作将检验以下假设：1）沉积物中的微栖息地群中的无孔有孔虫簇； 2）食物类型会影响有孔虫同位素值； 3）共生体的存在是物种内部和物种之间的可变，并且这种变异反映在碳同位素特征中。 这项工作应该对底栖有孔虫测试（壳体）的碳同位素组成（壳）的碳同位素组成（壳）的重要问题提供洞察力？这个问题的答案对于渗水和非潜在环境中的古环境重建至关重要。 这些资金还将用于包括社区外展（当地学校演讲，网站开发）和跨学科的，对本科，研究生和开学委员会后几位未来科学家的动手培训，包括代表性不足的群体。