Abstract Globally, invasive species in grasslands and shrublands have substantially altered trophic interactions and ecosystem processes. In North America, cheatgrass (Bromus tectorum) has invaded much of the western sage-steppe, leading to substantial shifts in plant communities and fire regimes. The effects of this cheatgrass invasion on small mammals are inconsistent among species and regions, and the mechanisms behind these patterns may be trophic or non-trophic. Cheatgrass alters cover and the amount of bare ground, thus affecting movements and predation risk, but cheatgreass also provides food for some rodents. We examined the extent to which low-density cheatgrass invasion (

中文翻译：

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加拿大不列颠哥伦比亚省欺骗草入侵地点小鼠的密度和栖息地选择

摘要 在全球范围内，草原和灌木丛中的入侵物种极大地改变了营养相互作用和生态系统过程。在北美洲，作弊草（Bromus tectorum）已经侵入了西部鼠尾草草原的大部分地区，导致植物群落和火势发生重大变化。这种欺骗草入侵对小型哺乳动物的影响在物种和地区之间并不一致，这些模式背后的机制可能是营养性的，也可能是非营养性的。Cheatgrass 改变覆盖物和裸露地面的数量，从而影响运动和捕食风险，但 Cheatgrass 也为一些啮齿动物提供食物。我们检查了低密度欺骗草入侵的程度（