Phylogeny of the Diatom Stephanodiscus yellowstonensis

黄石硅藻的系统发育

• 批准号: 9107278
• 负责人: Edward Theriot
• 金额: $ 37.76万
• 依托单位: Academy of Natural Sciences Philadelphia
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-01-15 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9107278&HistoricalAwards=false
• 关键词: Phylogeny; Diatom; Stephanodiscus; yellowstonensis

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.

一种单细胞藻类（黄石硅藻）大约 12,000 至 8,000 年前起源于怀俄明州的黄石湖，显然来自其最近的亲戚，生活在附近湖泊的 S. niagarae。 这项研究的意义远远超出了硅藻物种形成的详细描述。 拟议的研究涉及从控制新物种起源的因素到全球气候变化的广泛问题。 该项目整合了 3 个方面的证据：古生物学、形态学和遗传学。 将收集世界上一些最大的高海拔湖泊（怀俄明州西北部的黄石湖和杰克逊湖以及它们之间的一系列湖泊）的沉积物记录。 从这些沉积物记录中，可以获得区域气候变化的详细记录（使用花粉、硅藻、氧同位素、颗粒大小和其他可用特征）。 这些信息将与该新物种在 4,000 年内（全新世早期，全球变暖严重的时期）的极其详细和连续的记录进行比较。 除其他结果外，我们期望获得物种变化的详细记录，作为对全球变暖导致的整个生态系统变化的反应。 这项研究将有助于作为预测地球生物群变化的基础，以应对未来可能出现的人为和/或自然的全球变化。