Invasive Species
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These abstracts of recent papers on range management in the West were prepared by Charlie Clements, Rangeland Scientist, USDA Agricultural Research Service, Reno, NV.
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This brief synthesizes best-management practices for reducing non-native grasses while increasing native species and desirable features in desert tortoise habitats.
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In this study, researchers determined vegetation response to fuel reduction by tree mastication (shredding) or seeding and then shredding by measuring cover of shrub and herbaceous functional groups on shredded and adjacent untreated areas on 44 sites in Utah. Findings suggested that shredding or seeding and then shredding should facilitate wildfire suppression, increase resistance to weed dominance, and lead toward greater resilience to disturbance by increasing perennial herbaceous cover.
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These abstracts of recent papers on rangeland management in the West were prepared by Charlie Clements, Rangeland Scientist, USDA Agricultural Research Service, Reno, NV.
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The Sage Grouse Initiative Interactive Web App is a tool to catalyze and improve habitat conservation efforts across the western United States. It presents cutting-edge geospatial data covering 100 million acres, which helps visualize, distribute, and interact with information about the sagebrush-steppe ecosystem.
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In this article, researchers report a dramatic population number expansion of Salsola ryanii in the decade since it was originally documented. Salsola ryanii has every indication of being just as invasive as its highly invasive parents.
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This study suggests that introduced species have disproportionately expanded their ranges upward in elevation over the past century when compared with native species. While these shifts in introduced species may not be exclusively driven by climate, they highlight the importance of considering the interacting factors of climate-driven range shifts and invasion to understand how floras are responding in the face of anthropogenic change.
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This study tested the stress-gradient hypothesis (SGH) in observations of 75 sites along overlapping water and heat stress and disturbance gradients. As stress-disturbance levels increase, sagebrush-herbaceous plant facilitation levels increase, the landscape will become increasingly aggregated as a product of necessary facilitation between sagebrush and herbaceous plants. This aggregation 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.
View abstracts.
These abstracts of recent papers on rangeland management in the West were prepared by Charlie Clements, Rangeland Scientist, USDA Agricultural Research Service, Reno, NV.
View article.
This study found that early seral natives generally outperformed late seral natives when growing with exotics and had earlier emergence timing, although results differed among functional groups and soil types. Survival probabilities, however, did not differ between the early and late seral mixes when growing without exotics. Within each seed mix, native grasses exhibited the highest emergence probabilities of the functional groups. Natives did not suppress exotics in early life stages. Performance of B. tectorum was higher on sandy loam, while T. caput-medusae was highly successful in both soil types. Performance of native functional groups differed by soil type when growing with exotics but did not differ when growing without exotics. Survival of native grasses, in particular, was generally higher on sandy loam when growing with exotics.