CRB: Risk of Extinction and Conservation Biology of Rare Plants in Oceanic Islands

这项研究的目的是通过研究海洋岛屿珍稀植物的遗传和形态变异以及繁殖生物学方面的问题，为评估海洋岛屿珍稀植物的灭绝风险提供一般指南。等位酶和RAPD将用于测量胡安费尔南德斯群岛上繁殖生物学上不同的珍稀植物物种中不同大小种群的多样性。这将决定较小的种群是否可能面临更大的灭绝风险，因为遗传多样性较低和/或由于近亲繁殖衰退、缺乏传粉者或雌雄异株物种的性别比例扭曲而导致的结实率减少。还将评估繁殖系统、传粉者和种子传播者等生殖生物学方面不同物种的种群内和种群之间遗传多样性的水平和分配情况。这项研究中产生的数据应为评估海洋岛屿特有的许多濒危和受威胁物种以及内陆地区零散和少量种群的灭绝风险提供指导。拟议中的工作将具有很强的教育成分，因为岛屿上的国家公园导游、智利研究生和智利教职员工将接受保护生物学各个方面的培训。

The purpose of this research is to provide eneral guidelines for assessing risks of extinction in rare plants on oceanic islands by studying their genetic and morphological variation and aspects of the reproductive biology/. Allozymes and RAPDs will be used to measured diversity within populations of different sizes in selected species of rare plants on the Juan Fernandez Islands that differ in reproductive biology. This will determine whether smaller populations may be at greater risk of extinction because of lower genetic diversity and/or reduced seed set due to inbreeding depression, lack of pollinators, or skewed sex ratios in dioecious species. The level and apportionment of genetic diversity within and among populations of species differing in aspects of reproductive biology such as breeding systems, pollinators, and seed dispersers will also be assessed. The data generated in this study should provide guidelines for assessing the risk of extinction in the many endangered and threatened species endemic to oceanic islands, as well as for fragmented and small populations in contin ental areas. The proposed work will have a strong educational component because National Park guides on the islands, Chilean graduate students, and Chilean faculty members will receive training in various aspects of conservation biology.