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• W3201623015 abstract "Abstract Aim In the western US, sagebrush ( Artemisia spp.) and salt desert shrublands are rapidly transitioning to communities dominated by exotic annual grasses, a novel and often self-reinforcing state that threatens the economic sustainability and conservation value of rangelands. Climate change is predicted to directly and indirectly favor annual grasses, potentially pushing transitions to annual grass dominance into higher elevations and north-facing aspects. We sought to quantify the expansion of annual grass-dominated vegetation communities along topographic gradients over the past several decades. Location Our analysis focused on rangelands among three ecoregions in the Great Basin of the western US, where several species of exotic annual grasses are widespread among shrub and perennial grass-dominated vegetation communities. Methods We used recently developed remote sensing-based rangeland vegetation data to produce yearly maps of annual grass-dominated vegetation communities spanning the period 1990–2020. With these maps, we quantified the rate of spread and characterized changes in the topographic distribution (i.e., elevation and aspect) of areas transitioning to annual grass dominance. Results We documented more than an eight-fold increase in annual grass-dominated area (to >77,000 km 2 ) occurring at an average rate of >2,300 km 2 yr -1 . In 2020, annual grasses dominated one fifth (19.8%) of Great Basin rangelands. This rapid expansion is associated with a broadening of the topographic niche, with widespread movement into higher elevations and north-facing aspects. Main conclusions Accelerated, strategic intervention is critically needed to conserve the fragile band of rangelands being compressed between annual grassland transitions at lower elevations and woodland expansion at higher elevations." @default.
• W3201623015 created "2021-09-27" @default.
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• W3201623015 date "2021-01-06" @default.
• W3201623015 modified "2023-09-25" @default.
• W3201623015 title "The elevational ascent and spread of invasive annual grass dominance in the Great Basin, USA" @default.
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• W3201623015 doi "https://doi.org/10.1101/2021.01.05.425458" @default.
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