Increased competitive ability and herbivory tolerance in the invasive plant Sapium sebiferum
Increased competitive ability and herbivory tolerance in the invasive plant Sapium sebiferum
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DOI：
10.1007/s10530-007-9130-0
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发表时间：
2008-03
影响因子：
2.9
通讯作者：
Jianwen Zou;W. E. Rogers;E. Siemann
中科院分区：
文献类型：
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作者：
Jianwen Zou;W. E. Rogers;E. Siemann
竞争能力增强的进化（EICA）假说预测，外来植物在引入的范围内释放天敌，有利于外来植物进化为具有更强的竞争能力和更低的草食动物抗性。我们测试了EICA假设在一个共同的花园实验与乌桕幼苗从本地（中国）和入侵（美国）种群生长在所有成对的组合在本地范围（中国）在草食动物的存在下。当配对的幼苗来自同一大陆，芽质量和叶损伤每苗显着更大的植物从入侵种群比那些从本地人口。尽管来自食草动物的破坏更大，但当它们生长在一起时，入侵种群的植物仍然优于本地种群的植物。入侵种群的竞争能力和较高的植食性损害相对于本地种群的S。sebiferum支持EICA假说。回归的生物量对百分之叶损伤表明，从入侵种群的植物耐受草食动物更有效地比那些从本地人口。本研究结果表明，S. sebiferum已成为一种生长更快，更少的植食性抗性，更耐植食性植物在引进范围。这意味着外来植物竞争能力的提高可能与引进范围内对草食动物的抗性和耐受性的进化变化有关。了解这些进化的变化有重要的意义，针对有问题的入侵者的生物控制策略。
The evolution of increased competitive ability (EICA) hypothesis predicts that release from natural enemies in the introduced range favors exotic plants evolving to have greater competitive ability and lower herbivore resistance than conspecifics from the native range. We tested the EICA hypothesis in a common garden experiment withSapium sebiferumin which seedlings from native (China) and invasive (USA) populations were grown in all pairwise combinations in the native range (China) in the presence of herbivores. When paired seedlings were from the same continent, shoot mass and leaf damage per seedling were significantly greater for plants from invasive populations than those from native populations. Despite more damage from herbivores, plants from invasive populations still outperformed those from native populations when they were grown together. Increased competitive ability and higher herbivory damage of invasive populations relative to native populations ofS. sebiferumsupport the EICA hypothesis. Regression of biomass against percent leaf damage showed that plants from invasive populations tolerated herbivory more effectively than those from native populations. The results of this study suggest thatS. sebiferumhas become a faster-growing, less herbivore-resistant, and more herbivore-tolerant plant in the introduced range. This implies that increased competitive ability of exotic plants may be associated with evolutionary changes in both resistance and tolerance to herbivory in the introduced range. Understanding these evolutionary changes has important implications for biological control strategies targeted at problematic invaders.