Phylogeny of the Diatom Stephanodiscus yellowstonensis

一种单细胞硅藻（Stephanodiscus yellowstonensis） 起源于怀俄明州黄石湖，数量约为12，000至8，000只 年前，显然是从它最近的亲戚，S。尼亚加拉河， 生活在附近的湖泊里 这项研究的意义深远 除了详细描述硅藻物种形成之外 拟议 研究涉及广泛的问题， 控制新物种的起源和全球气候变化。 的 该项目整合了3条证据线：古生物学， 形态学和遗传学。 一些沉积物记录 世界上最大的高海拔湖泊（黄石湖和 怀俄明州西北部的杰克逊湖和一系列湖泊之间 ）将被收集。 从这些沉积物记录中， 区域气候变化的记录（使用花粉、硅藻、氧气 同位素、粒度和其他可用特征）将被 得到了 这些信息将被与一个 这一新物种的详细和连续的记录， 4,000年（全新世早期，全球重要的时间） 暖）。 在其他结果中，我们希望获得详细的 物种变化的记录，作为对整个生态系统的反应 应对全球变暖。 这项研究将有助于 作为预测地球生物群变化的基础 未来可能的全球变化，人为的和/或自然的。

A single celled alga, (the diatom Stephanodiscus yellowstonensis) originated in Yellowstone Lake, Wyoming from about 12,000 to 8,000 years ago, apparently from its nearest relative, S. niagarae which lives in nearby lakes. The significance of the research goes far beyond a detailed description of diatom speciation. The proposed research speaks to a broad range of questions from factors controlling origin of new species to global climate change. The project integrates 3 lines of evidence: paleontological, morphological, and genetic. Sediment records from some of the largest high altitude lakes in the world (Yellowstone Lake and Jackson Lake in northwestern Wyoming and a series of lakes between them) will be collected. From these sediment records a detailed record of regional climatic change (using pollen, diatoms, oxygen isotope, grain size and other features as available) will be obtained. The information will be compared to an extraordinarily well detailed and CONTINUOUS record of this new species within a 4,000 year period (the early Holocene, a time of significant global warming). Among other results, we expect to obtain a detailed record of change in species as a response to entire ecosystem change in response to global warming. This study will help serve as a basis for predicting changes in the earth's biota in response to possible future global change, anthropogenic and/or natural.