Dissertation Research: Effects of Plant Diversity on Community Invasibility in a California Riparian System

论文研究：植物多样性对加州河岸系统群落入侵的影响

基本信息

批准号：
9901984
负责人：
Carla D'Antonio
金额：
$ 0.77万
依托单位：
University of California-Berkeley
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1999
资助国家：
美国
起止时间：
1999-05-01 至 2001-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9901984&HistoricalAwards=false
关键词：
Dissertation Research Effects Plant Diversity

项目摘要

9901984D'AntonioGreat concern over the impacts of invasive species has stimulated renewed interest in the hypothesis that diverse communities better resist invasion. Evaluating this hypothesis in natural communities has proven challenging because variation in diversity is controlled by, and therefore covaries with, disturbance, resources, consumers, etc.-the same factors directly impacting invasions. This research will isolate the independent effects of diversity and the effects of these covarying factors on the invasibility of sedge tussocks that dominate the Eel River. Each tussock houses a mini-community, varying naturally in native plant diversity, making an ideal system to explore the diversity-invasibility relationship. Exotic and native plants will be introduced on tussocks varying naturally in diversity and onto tussocks where diversity has been experimentally manipulated. This powerful combination will enable these investigators to determine how the number of species on a tussock influences its invasibility, evaluate the degree to which this relationship is driven by native diversity, and explore the underlying mechanisms. By additionally examining how diversity relates to invasibility at scales broader than the tussock, this research will also evaluate how the diversity-invasibility relationship changes with scale. This research will aid the conservation of threatened riparian communities, and enhance the predictability of invasion patterns across landscapes.

9901984D'Antonio 对入侵物种影响的极大关注激起了人们对多元化社区更好地抵抗入侵这一假设的新兴趣。事实证明，在自然群落中评估这一假设具有挑战性，因为多样性的变化受到干扰、资源、消费者等的控制，因此与干扰、资源、消费者等共同变化——这些因素直接影响入侵。这项研究将分离多样性的独立影响和这些共变因素对鳗鱼河中占主导地位的莎草草丛入侵性的影响。每个草丛都有一个迷你群落，本地植物多样性自然变化，形成了探索多样性与入侵关系的理想系统。外来植物和本土植物将被引入多样性自然变化的草丛中，以及通过实验操纵多样性的草丛中。这种强大的组合将使这些研究人员能够确定草丛上的物种数量如何影响其入侵性，评估这种关系在多大程度上由本地多样性驱动，并探索潜在的机制。通过额外研究比草丛更广泛的尺度上多样性与入侵性的关系，这项研究还将评估多样性与入侵性关系如何随尺度变化。这项研究将有助于保护受威胁的河岸群落，并提高跨景观入侵模式的可预测性。