Index of Alien Impact: A Method for Evaluating Potential Ecological Impact of Alien Plant Species
Index of Alien Impact: A Method for Evaluating Potential Ecological Impact of Alien Plant Species
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外来影响指数：一种评估外来植物物种潜在生态影响的方法
DOI：
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发表时间：
2010
影响因子：
3.5
通讯作者：
Ted L. Ernst
中科院分区：
文献类型：
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作者：
Teresa K. Magee;P. Ringold;M. Bollman;Ted L. Ernst
外来植物物种是生态系统的压力源，也是生态系统完整性降低的指标。压力的大小不仅反映了存在的外星人的数量，还反映了他们与本地生态系统相互作用的质量。我们制定了外来影响指数（IAI）来估计原地外来物种的集体生态影响。 IAI 总结了特定地点或群落类型中存在的所有外来物种的个别外来物种的发生频率和潜在生态影响（入侵性影响评分 (Ii)）。组成指标 Ii 基于反映机制的生态物种特征（生活史、生态幅度和改变生态系统过程的能力），这些特征可以增加对生态系统结构和功能的影响。虽然 Ii 不像其他一些关于外星人影响的多指标排名那么复杂，但它与这些指标和定性判断相比效果很好。 IAI 可以通过修改 Ii 中纳入的物种性状集来适应不同的生态环境，以反映可能突破生物和非生物屏障或改变特定区域或利益群落类型的生态系统功能的特性。为了演示我们的方法，我们创建了 IAI 和 Ii 版本，适用于跨越美国俄勒冈州东部低海拔干旱到中温山地栖息地的河流流域（19,631 平方公里）的多样化河边植被。在本次演示工作中，我们（1）评估 IAI 与描述入侵水平的指标之间的关系，以及（2）说明 IAI 在优先考虑外来物种管理活动和告知恢复目标方面的潜在效用。
Alien plant species are stressors to ecosystems and indicators of reduced ecosystem integrity. The magnitude of the stress reflects not only the quantity of aliens present, but also the quality of their interactions with native ecosystems. We develop an Index of Alien Impact (IAI) to estimate the collective ecological impact of in situ alien species. IAI summarizes the frequency of occurrence and potential ecological impact (Invasiveness-Impact Score (Ii)) of individual alien species for all aliens present in a particular location or community type. A component metric, Ii, is based on ecological species traits (life history, ecological amplitude, and ability to alter ecosystem processes) that reflect mechanisms, which can increase impact to ecosystem structure and function. While Ii is less complex than some other multi-metric rankings of alien impact, it compares well to these metrics and to qualitative judgments. IAI can be adapted for different ecological settings by modifying the set of species traits incorporated in Ii to reflect properties likely to breach biotic and abiotic barriers or alter ecosystem function in a particular region or community type of interest. To demonstrate our approach, we created versions of IAI and Ii, applicable to the diverse streamside vegetation of a river basin (19,631 km2) spanning low-elevation arid to mesic montane habitats in eastern Oregon, USA. In this demonstration effort, we (1) evaluate relationships of IAI to metrics describing invasion level, and (2) illustrate the potential utility of IAI for prioritizing alien species management activities and informing restoration goals.