Invasive species are a global threat to ecosystem biodiversity and function; non-native grass invasion has been particularly problematic in sparsely vegetated ecosystems such as open dunes. Native plant population responses to invasion, however, are infrequently translated to landscape scales, limiting the effectiveness of these data for addressing conservation issues. We quantified population density, total population size, and age class distribution of the federally-endangered plant species Antioch Dunes evening primrose (Oenothera deltoides subsp. howellii), at sites along a non-native grass invasion gradient in California, USA. We then scaled relationships between invasion and plant density across the species’ range using spatial models and remote sensing data. Adult and juvenile O. deltoides subsp. howellii densities were more than 10 times higher in non-invaded areas (grids with 10% total plant cover) when compared to highly-invaded areas (grids with 80% total plant cover). The ratio of O. deltoides subsp. howellii juveniles to adults decreased to less than 1 at 54% total cover, highlighting sensitivity of the regeneration niche to invasion. Spatial models mapped hotspots of O. deltoides subsp. howellii abundance and population structure across the landscape at sub-meter scales. Scaling the impacts of increasing invasion on plant species of conservation concern holds promise when coupled with remote sensing approaches, especially in naturally low-cover ecosystems where readily available metrics (e.g., Normalized Difference Vegetation Index) can be used to quantify invasion. These spatial models inform how future invasive species management may influence population size and spatial distribution of species of conservation concern.

入侵物种是对生态系统生物多样性和功能的全球威胁；在稀疏的生态系统（例如开放的沙丘）中，非本地草入侵尤其成问题。然而，本地植物种群对入侵的反应很少被转换成景观尺度，从而限制了这些数据解决保护问题的有效性。我们量化人口密度，人口总数，以及联邦濒危植物物种的安提阿沙丘月见草年龄组分布（月见草黑杨亚种。howellii），沿在美国加利福尼亚州一个非本地草入侵梯度网站。然后，我们使用空间模型和遥感数据来缩放整个物种范围内入侵与植物密度之间的关系。成人和少年O. deltoides亚种 howellii相比高度侵入区域（有80％的总植物覆盖栅极）时在非侵入区域（有10％的总植物覆盖栅极）密度均高于10倍以上。O. deltoides亚种的比率。成年人的howellii幼虫在总覆盖率的54％时降至不足1，突显了再生小生境对入侵的敏感性。空间模型映射了O. deltoides亚种的热点。豪威亚米尺度上整个景观的丰度和人口结构。当与遥感方法结合使用时，扩大入侵对植物保护的影响的规模有望扩大，特别是在自然覆盖率低的生态系统中，在这些生态系统中，可以使用随时可用的度量标准（例如归一化植被指数）来量化入侵。这些空间模型揭示了未来的入侵物种管理将如何影响种群数量和受保护物种的空间分布。