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Resource-use efficiency and plant invasion in low-resource systems

机译:低资源系统中的资源利用效率和植物入侵

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摘要

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, a pattern consistent with traits generally associated with successful invaders (high growth rates, early reproduction and many offspring). 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, 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, and suggest that managing resource levels is not always an effective strategy for invasive species control.
机译:没有任何一种物种可以在所有环境中最大化生长,繁殖和竞争能力,因此,入侵物种的成功取决于栖息地。营养丰富的生境通常比资源贫乏的生境遭受更多的入侵,这种模式与成功入侵者通常具有的特征一致(高生长率,早期繁殖和许多后代)。但是,入侵者确实在资源匮乏的环境中殖民,并且使他们成功在这些系统中运行的机制知之甚少。与资源保护有关的特征广泛分布于适应资源贫乏环境的物种中,而入侵物种可通过利用资源节约特性(例如资源利用效率高(RUE;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生境的入侵和本地物种的RUE,这些生境的光,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学多样性中,入侵物种在短时间内使用有限资源通常比本地物种更有效率,而在整个叶片寿命中整合RUE措施时,入侵物种的效率也相似。我们的数据挑战了在资源匮乏的情况下本地物种通常优于入侵物种的观点,并建议管理资源水平并非始终是入侵物种控制的有效策略。

著录项

  • 来源
    《Nature》 |2007年第7139期|p.1079-1081|共3页
  • 作者单位

    Department of Biological Sciences, Stanford University, Stanford, California 94305-5020, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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