REU: Phytoplankton Flux in the Gulf of California: Seasonal Variations, Sediment Preservation, and the Last Glacial-Interglacial Transition

这补充了最近资助的一个项目， 在东部和西部的沉积物收集器两年， 加州湾，将涵盖大量通量的工作， 浮游有孔虫、放射虫和稳定同位素。 这 研究将集中在四个可合并的组别， 浮游植物微化石--硅藻，硅鞭藻，恐龙， 鞭毛虫和钙质超微化石。 每个分类群的通量 将被确定，和组成的陷阱为基础的 与下伏表层沉积物的物质比较 用盒式岩芯回收。 该研究将研究季节性 浮游植物的演替，以及年际和空间 其变化，以确定其程度， 原始的季节信号保存在沉积物中。 变化 每隔1000年对浮游植物进行一次检查 在整个取芯部分，在东西两侧， 解决有关季节性上升流变化的问题， 降水和河流径流变化的证据。 研究 将扩展一个正在开发的模型，以描述 硅藻的生物群落向化石群落的转变，以及 为钙质超微化石建立第一范围模型， 硅鞭毛虫

This complements a recently-funded project to deply biweekly sediment traps for two years on the eastern and western sides of the Gulf of California which will cover work on bulk fluxes, planktonic foraminifera, radiolaria and stable isotopes. This study will concentrate on four preservable groups of phytoplankton microfossils--diatoms, silicoflagellates, dino- flagellates and calcareous nannofossils. Fluxes of each taxon will be determined, and the composition of the trap-based material compared with that of underlying surface sediments recovered by box cores. The study will examine the seasonal succession of phytoplankton, and the internannual and spatial variation thereof, in order to determine the degree to which the original seasonal signal is preserved in the sediments. Changes in phytoplankton will be examined at 1000 year intervals throughout the cored section, on eastern and western sides, to address questions concerning changes in seasonal upwelling and evidence for changed precipitation and river runoff. The study will expand upon a model being developed to describe the transformation of biocoenosis to taphocoenosis for diatoms, and produce a first-range model for calcareous nannofossils and silicoflagellates.