Abstract

ABSTRACTShrub invasion after disturbance affects agriculture and conservation in arid rangelands. After a 2010 wildfire in southwestern Wyoming, USA ranchers perceived rabbitbrush (Chrysothamnus viscidiflorus) had increased in burned sagebrush (Artemisia tridentata) dominated areas. Using paired burned-unburned transects stratified across four ecological sites, we determined that ecological site, not fire, explained C. viscidiflorus density. Fire reduced A. tridentata but only increased the visibility, not the density, of the shorter C. viscidiflorus portion of the shrub community. We must differentiate between actual community shifts versus perceived shifts by placing plant succession and disturbance within the context of Ecological Site Descriptions (ESDs).

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