Resource-use efficiency and plant invasion in low-resource systems
Resource-use efficiency and plant invasion in low-resource systems
复制标题
DOI：
10.1038/nature05719
复制
发表时间：
2007-04-26
期刊：
影响因子：
64.8
通讯作者：
Vitousek, Peter M.
中科院分区：
文献类型：
--
作者：
Funk, Jennifer L.;Vitousek, Peter M.
没有一个物种可以在所有环境中最大限度地提高生长、繁殖和竞争能力，因此入侵物种的成功取决于栖息地。营养丰富的栖息地往往比资源贫乏的栖息地经历更多的入侵（1-4），这种模式与成功入侵者通常相关的特征（高生长率，早期繁殖和许多后代（5-8））一致。然而，入侵者确实会在资源贫乏的环境中殖民，而且人们对它们在这些系统中成功的机制知之甚少。与资源保护相关的特征在适应资源贫乏环境的物种中广泛存在（9-11），入侵物种可能通过利用资源保护特征（如高资源利用效率（芸香;每单位资源的碳同化））在低资源环境中取得成功。我们调查了来自夏威夷三个栖息地的入侵物种和本地物种的芸香，在这些栖息地中，光、水或养分的可用性限制了植物的生长。在这里，我们表明，在多种生长形式和广泛的分类多样性，入侵物种通常比本地物种更有效地利用有限的资源在短时间内，同样有效的芸香措施时，集成在叶片寿命。我们的数据挑战了在资源可用性低的条件下本地物种通常优于入侵物种的想法，并表明管理资源水平并不总是入侵物种控制的有效策略。
No species can maximize growth, reproduction and competitive ability across all environments, so the success of invasive species is habitat-dependent. Nutrient-rich habitats often experience more invasion than resource-poor habitats(1-4), a pattern consistent with traits generally associated with successful invaders ( high growth rates, early reproduction and many offspring(5-8)). However, invaders do colonize resource-poor environments, and the mechanisms that allow their success in these systems are poorly understood. Traits associated with resource conservation are widespread among species adapted to resource-poor environments(9-11), and invasive species may succeed in low-resource environments by employing resource conservation traits such as high resource-use efficiency ( RUE; carbon assimilation per unit of resource). We investigated RUE in invasive and native species from three habitats in Hawaii where light, water or nutrient availability was limiting to plant growth. Here we show that across multiple growth forms and broad taxonomic diversity invasive species were generally more efficient than native species at using limiting resources on short timescales and were similarly efficient when RUE measures were integrated over leaf lifespans. Our data challenge the idea that native species generally outperform invasive species under conditions of low resource availability(3), and suggest that managing resource levels is not always an effective strategy for invasive species control.