Paleoenvironments and Cenozoic Evolution of Tropical American Vegetation: Guatemala, Jamaica and Costa Rica

美洲热带植被的古环境和新生代演化：危地马拉、牙买加和哥斯达黎加

• 批准号: 8819771
• 负责人: Alan Graham
• 金额: --
• 依托单位: Kent State University Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-04-01 至 1992-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8819771&HistoricalAwards=false
• 关键词: Paleoenvironments; Cenozoic; Evolution; Tropical; American

The Isthmus of Panama was uplifted several million years ago, leading to isolation of the eastern Pacific and western Caribbean marine realms, and interchange between the terrestrial biotas of North and South America. Dr. Alan Graham has been actively sampling and interpreting deposits of fossil pollen from Central America, with the goal of interpreting the climatic and vegetational history of the region before and during the uplift of the Ishthmus. He now proposes to extend his earlier sampling of Miocene strata in Panama to both older and younger formations in Jamaica, Guatemala, and Costa Rica. The proposed research will expand greatly our understanding of this critical episode in earth history. These pollen records will lead to better reconstructions of the climatic and ecological history of the region, and will shed new light on how and why certain plant and animal groups migrated across the Ishthmus while others did not. Dr. Graham will continue toward his eventual goal of understanding the evolutionary history of the biotic communities we now see in the tropics of the New World.

巴拿马地峡在几百万年前被抬升，导致东太平洋和西加勒比海海域的隔离，以及南北美洲陆地生物的交换。艾伦·格雷厄姆博士一直在积极采样和解释来自中美洲的化石花粉沉积物，目的是解释该地区在伊施莫斯隆起之前和期间的气候和植被历史。他现在建议将他早先在巴拿马中新世地层的取样扩展到牙买加、危地马拉和哥斯达黎加的更古老和更年轻的地层。拟议中的研究将大大扩展我们对地球历史上这一关键事件的理解。这些花粉记录将有助于更好地重建该地区的气候和生态历史，并将为某些植物和动物群体如何以及为什么穿越伊施莫斯而其他人没有迁移提供新的线索。格雷厄姆博士将继续朝着他的最终目标，即理解我们现在在新世界热带地区看到的生物群落的进化历史。