Stress gradients and community stability in sagebrush ecosystems

Stress-gradient hypothesis explains susceptibility to Bromus tectorum invasion and community stability in North America’s semi-arid Artemisia tridentate wyomingensis ecosystems.  Journal of Vegetation Science (2015). Michael D. Reisner, Paul S. Doescher & David A. Pyke.

View the summary and talking points or the journal article.
As stress-disturbance levels increase, causing sagebrush-herbaceous plant facilitation levels to increase, the landscape will become increasingly aggregated as a product of necessary facilitation between sagebrush and herbaceous plants.  This aggregation through necessity decreases the individual resilience of the native herbaceous plants, increases the competition from invasive plants, and decreases the overall stability and resilience of the sagebrush steppe ecosystem.