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在与海水不平衡时对稳定同位素的分馏问题，以及它们的同位素记录中包含的错误环境信号。pi将在受控实验下使用底栖有孔虫氨虫的培养种群，以确定什么环境会在海洋沉积物中产生同位素不平衡。将在12种温度/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、贝壳和周围孔隙水的稳定同位素组成的影响，以量化环境在形态/同位素行为中的作用。资金将提供两年，资金将由MGG、BP和CO项目共享。

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.