Invasive Species

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Sagebrush ecosystem recovery 10+ years after treatments

Symposium recording

The Sagebrush Ecosystem Recovery symposium will provide Sagebrush Steppe Treatment Evaluation Project (SageSTEP) updates. It will be held in conjunction with the Society for Range Management Virtual Meeting. It will share what’s been learned after at least 10 years post-treatment. **You do not need to be registered for the SRM meeting to join.

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Nevada Society for Range Management Suggested Reading – Fall 2020

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Abstracts of Recent Papers on Range Management in the West. Prepared by Charlie Clements, Rangeland Scientist, USDA Agricultural Research Service, Reno, NV.

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Invasive species, native seeds, and grasses

Webinar recording.

Disturbance events, such as overgrazing and the catastrophic fires, in our shrub steppe landscape can kick-start a negative feedback loop with invasion of noxious weeds. These invasive species can have a direct effect on services and ecological benefits provided by the shrug steppe landscape. Learn what we can do to minimize the spread of invasive plant species and how native seeds and grasses can be used to restore this brittle system.

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Invasive Annual Grass Workshop

Workshop information.

Invasive annual grasses threaten millions of acres of sagebrush rangelands across the west. This two day workshop hosted by the Harney County Wildfire Collaborative and Oregon SageCon Partnership will explore the barriers and opportunities for addressing invasive annual grasses in Oregon and beyond the state. In this workshop some of the most pressing issues related to invasive annual grass management will be discussed, including the connection between invasive annual grasses and wildfire and what can be done to better address this threat.

VIRTUAL Workshop Dates & Agenda
Monday, December 14, 12:30-4:30pm: Defend the Core—Keeping the Good, Good

  • Hard truths of invasive annual grasses
  • Stopping the Spread
  • Supersizing Suppression Success
  • Reducing Wildfire Risk
  • Ratcheting Up Resiliency

Tuesday, December 15, 8:30am-12:30pm: Grow the Core—Restoring At-Risk and Converted Lands

  • Managing Invasive Annual Grasses
  • Innovative Restoration
  • Prioritizing Limited Resources & Sustaining Long-term Investment
  • Where Do We Go From Here
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Wildfire and invasives in sagebrush: current and future management challenges – A gap report update

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This Gap Report Update is the latest addition to the list of valuable products of the Working Group designed to help identify the challenges (gaps) and offer ideas to address those challenges. The Gap Report Update has something for every level, public and private, to consider helping address the fire and invasive threat. It is our hope that the leaders of the various state and federal agencies will review the recommendations in the report and determine if there are things they can affect directly to address the gaps. It took a multi-agency, multi-discipline Working Group to identify the problems and provide possible solutions to these conservation and management challenges, it will certainly take a broad-based coalition of agencies, and public and private groups working together to ensure a healthy Sagebrush Biome is available for generations to come.

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Cheatgrass, medusahead, and ventenata: Symposium and field trip

View Part 1 (2:12) and Part II (2:08) recordings of this symposium.

This special half-day webinar symposium provides an in-depth review of three invasive grasses (cheatgrass, medusahead, ventenata) in the Western US.

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Top 50 invasive species in the West from the Western Governors Association

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The Western Governors’ Association (WGA) has addressed this need by surveying invasive species coordinators in WGA member states and territories Top 50 Invasive Species in the West to develop the “Top 50 Invasive Species in the West.” The compilation of terrestrial and aquatic invasive species includes highly-publicized examples such as cheatgrass, Quagga Mussels, tamarisk and the Emerald Ash Borer. The list also encompasses less well known, but still impactful, examples such as leafy spurge, Red shiner, Russian knapweed, and Golden algae.

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Indicators of ventenata invasion in sagebrush steppe rangelands

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Though widely distributed throughout the study region, ventenata only appeared in 45% of the 225 plots, and foliar cover was typically less than 50%. It was primarily found in ephemerally wet microhabitats. Species richness and the Shannon diversity index were lowest in plots with high V. dubia cover. Nonmetric multidimensional scaling analysis revealed that ventenata and medusahead were closely associated. Furthermore, chi-square indicator analysis showed that T. caput-medusae was more prevalent, while mountain big sagebrush was less prevalent, in plots containing ventenata. Abiotic factors that explained variation in ventenata abundance included rock cover, soil depth, and a north/south aspect. Higher ventenata cover also correlated with higher clay content and lower phosphorus and potassium concentrations in the soil. We suggest that at this point, detection survey efforts to locate incipient infestations of ventenata in sagebrush steppe communities should focus on moist areas and sites susceptible to invasion by medusahead.

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Fire and grazing influence site resistance to cheatgrass invasion

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USGS scientists Lea Condon and David Pyke tested the idea that biotic communities mediate the effects of disturbances such as fire and grazing on site resistance by using structural equation modeling to test relationships between disturbance events, the biotic community, and resistance to cheatgrass invasion. Increased site resistance following fire was associated with higher bunchgrass cover and recovery of bunchgrasses and mosses with time since fire. Fire reduced near-term site resistance to cheatgrass on actively grazed rangelands, and evidence of grazing was more pronounced on burned sites and was positively correlated with cheatgrass cover. Independent of fire, grazing impacts resulted in reduced site resistance to cheatgrass, suggesting that grazing management that enhances plant and biocrust communities will also enhance site resistance.

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Fighting fire with native plants

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Large wildfires have dominated the news in much of the western U.S. this past summer. Conservancy scientists working in rangelands and forests are engaged in many efforts to understand, cope with or avoid the effects of these fires. In fact, one Conservancy field crew working in the Northern Great Basin Experimental Range (NGBER) was chased from their beds and field work by one of these fires for a few days. They were collecting data on novel restoration approaches to reduce the vulnerability of sagebrush habitat to large wildfires beforehand and recover more successfully after the fires. This involved replacing one of the key culprits contributing to wildfires in the west, cheatgrass, with native plant species.

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