Timing of the Closure of the Central American Isthmus: Evidence From Shallow-Water Benthic Foraminifera (Earth Science)

中美洲地峡关闭的时间：来自浅水底栖有孔虫的证据（地球科学）

• 批准号: 9002977
• 负责人: Laurel Collins
• 金额: $ 8.21万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-08-01 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9002977&HistoricalAwards=false
• 关键词: Timing; Closure; Central; American; Isthmus

Approximately three million years ago the emergence of the Isthmus of Panama from the sea divided the American tropical marine fauna in two, profoundly affecting the evolution and geographic distribution of many animals. The time of severance of deep.water connections has been studied, but Dr. Collins will determine the time of final closure using shallow.water benthic foraminifera. Fossil species of these abundant protists indicate the water depths in which they formerly lived. From strata dated with the newest biostratigraphic zonations, a sequence of water depths through time from both sides of the isthmus will be combined with taxonomic data on the biogeographic divergence of East Pacific and Caribbean foraminifera to date and the final closure of the isthmus. Standard laboratory and analytical methods will be used. The date of termination of the marine connection is important to evolutionary studies in paleontology, molecular biological studies of rates of genetic divergence, and calculations of regional tectonic uplift and the terrestrial interchange of South and North American vertebrates. Interactions with the host institution include: teaching an undergraduate course in biostratigraphy, leading a graduate seminar in paleobiogeography, co-teaching summer geology field camp, and arranging guest lectures by established women paleontologists. This project furthers VPW program objectives which are (1) to provide opportunities for women to advance their careers in engineering and in the disciplines of science supported by NSF and (2) to encourage women to pursue careers in science and engineering by providing greater visibility for women scientists and engineers employed in industry, government, and academic institutions. By encouraging the participation of women in science, it is a valuable investment in the Nation's future scientific vitality.

大约300万年前，巴拿马地峡从海中出现，将美洲热带海洋动物群一分为二，深刻地影响了许多动物的进化和地理分布。时光的分离之深。水的连接已经被研究过了，但柯林斯博士将用浅水来确定最终关闭的时间。水底栖有孔虫。这些丰富的原生生物的化石种类表明了它们以前生活的水深。根据最新的生物地层学带，地峡两侧的水深序列将与迄今为止东太平洋和加勒比有孔虫的生物地理分化和地峡最终关闭的分类数据相结合。将使用标准的实验室和分析方法。海洋联系的终止日期对于古生物学的进化研究、遗传分化率的分子生物学研究、区域构造隆起和南北脊椎动物陆生交换的计算都是重要的。与主办机构的互动包括：教授生物地层学的本科课程，领导古生物地理学的研究生研讨会，共同教授夏季地质学野外营地，并安排知名女性古生物学家的客座讲座。该项目进一步推进了VPW计划的目标，即(1)为女性提供在工程和NSF支持的科学学科中发展职业的机会；(2)通过为在工业、政府和学术机构工作的女性科学家和工程师提供更大的知名度，鼓励女性在科学和工程领域追求职业。通过鼓励妇女参与科学，这是对国家未来科学活力的宝贵投资。