REU: Sediment Microhabitats and Stable Isotope Disequilibriaof Cultured Benthic Foraminifera

建议：该项目将解决浮游生物和底栖生物物种与海水不平衡的稳定同位素的分馏问题，从而解决其同位素记录中包含的错误环境信号的问题。PIS将在受控实验下使用底栖有孔虫物种氨贝卡里的培养种群来确定海洋沉积物中产生同位素失衡的环境。将在12个温度/盐度/沉积物-碳组合下培养多达2000个个体。将确定对贝壳形态、贝壳稳定同位素组成和周围孔隙水的影响，以量化环境在形态/同位素行为中的作用。资金提供为期两年，资金将在MGG、BP和CO项目之间分享。

Recommendation: The project will address the problem of fractionation of stable isotopes in disequilibrium with seawater by planktonic and benthic species, and therefore the erroneous environmental signal contain in their isotopic record. The PIs will use culture populations of the benthic foraminiferal species, Ammonia beccarri, under controlled experiments to determine what environments generate isotopic disequilbrium in marine sediments. Up to 2000 individuals at 12 temperature/salinity/sediment-carbon combinations will be cultured. Effects on shell morphology, stable-isotopic composition of shells and surrounding pore waters will be determined to quantify the environmental role in morphology/isotope behavior. Funds are provided for two years and the funding will be shared between MGG, BP and CO programs.