CRB - The Impacts of Tropical Forest Fragmentation on Population Structure, Seed and Pollen Gene Flow and Future Genetic Diversity in the Tropical Tree Corythophora alta.

CRB - 热带森林破碎化对热带树木 Corythophora alta 种群结构、种子和花粉基因流以及未来遗传多样性的影响。

• 批准号: 9983014
• 负责人: Matthew Hamilton
• 金额: $ 24.49万
• 依托单位: Georgetown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-01-15 至 2003-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9983014&HistoricalAwards=false
• 关键词: CRB; Impacts; Tropical; Forest; Fragmentation

9983014 HamiltonTropical deforestation creates areas cleared of all trees and small, remnant patches of trees. Such forest fragments become refuges and the only source of future populations in a deforested landscape. The goal of this research is to determine if forest fragmentation causes changes in the movement of genes (gene flow) in tropical tree populations that may lead to loss of genetic diversity and increased extinction risk. This study will utilize experimental forest fragments at the Biological Dynamics of Forest Fragments Project near Manaus, Brazil and a canopy tree in the Brazil nut family, Corythophora alta, as a model species. Using nuclear and chloroplast DNA genetic markers to estimate pollen and seed movement, this study seeks to compare genetic organization and gene flow patterns of tree populations in undisturbed forest and fragmented forest.This research will estimate the impact of present-day tropical forest destruction on the genetic base of future forest populations that will inhabit geographically restricted areas. The results will give insights into the future genetic condition of degraded natural habitats, genetic information for biological reserve design and agroforestry projects, and a better understanding of the evolutionary genetics of tropical trees. The ultimate goal of this work is to estimate potential genetic impacts of fragmentation in order to prevent genetic erosion in species-rich Amazonian forests.

9983014汉密尔顿热带森林砍伐造成了被清理掉的所有树木和小块残存的树木。这样的森林碎片成为了避难所，也是森林砍伐地区未来人口的唯一来源。这项研究的目的是确定森林碎片化是否会导致热带树木种群中基因运动(基因流)的变化，从而可能导致遗传多样性的丧失和灭绝风险的增加。这项研究将利用巴西马瑙斯附近森林碎片生物动力学项目的实验森林碎片和巴西坚果家族的一棵树冠树作为模式物种。利用核和叶绿体DNA遗传标记来估计花粉和种子的运动，本研究试图比较未受干扰的森林和片断森林中树木种群的遗传组织和基因流动模式。这项研究将估计当今热带森林破坏对未来居住在地理受限地区的森林种群遗传基础的影响。这些结果将使人们深入了解退化自然栖息地未来的遗传状况，为生物保护区设计和农林项目提供遗传信息，并更好地了解热带树木的进化遗传学。这项工作的最终目标是估计碎片化的潜在遗传影响，以防止物种丰富的亚马逊森林的遗传侵蚀。