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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'安东尼奥对入侵物种的影响的极大关注激发了人们对多样性群落更好地抵御入侵这一假设的新兴趣。在自然群落中评估这一假设已被证明具有挑战性，因为多样性的变化受干扰，资源，消费者等的控制，因此与之协变。同样的因素直接影响入侵。这项研究将隔离的多样性和这些协变因素对主导鳗鱼河的莎草草丛入侵的独立影响。每个草丛都有一个小型社区，在原生植物多样性方面自然变化，这是探索多样性与入侵性关系的理想系统。外来和本地植物将被引入到自然多样性不同的草丛中，并被引入到多样性已经被实验操纵的草丛中。这种强大的组合将使这些研究人员能够确定草丛中物种的数量如何影响其入侵性，评估这种关系受本地多样性驱动的程度，并探索潜在的机制。通过进一步研究多样性与比草丛更宽尺度的入侵性之间的关系，本研究还将评估多样性与入侵性之间的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社区，并提高跨景观入侵模式的可预测性。