US Forest Service Research & Development
Contact Information
  • US Forest Service Research & Development
  • 1400 Independence Ave., SW
  • Washington, D.C. 20250-0003
  • 800-832-1355
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Happiness atop St Mary's peak in Montana.

Yvette K. Ortega

800 East Beckwith Avenue
United States

Phone: 406-542-3246
Fax: 406-543-2663
Contact Yvette K. Ortega

Current Research

* Evaluate invader impacts at population and community levels, including underlying mechanisms. * Examine interactive impacts of drought and herbivory by biological control agents on the competitive dominance of a notorious weed. * Assess a new technique for assessing habitat quality for songbirds based on local song structure. * Measure effects of invasive plant control treatments on plants and animals and evaluate degree to which such methods mitigate target invader impacts.

Research Interests

My primary interest lies in building understandings of ecological patterns and processes in order to improve the management of natural systems. Current applications include evaluating impacts of exotic plants on native plants, cascading effects on consumers, and efficacy of weed control efforts in mitigating these impacts. Studies consider population and community level attributes, and organisms from plants and invertebrate to birds and their predators.

Past Research

My past research includes examination of disturbance effects on harbor seals, edge effects of forest roads on songbirds, and habitat use of Canada lynx.

Why This Research is Important

My work aims to develop and apply ecological principles to solve real-world problems facing managers of natural systems.


  • University of California, Berkeley, B.A. Environmental Science 1992
  • University of Vermont, M.S. Wildlife and Fisheries Biology 1998

Featured Publications & Products


Research Highlights


An herbicide solution to knapweed

Station researchers evaluated the effects of a common herbicide treatment on grassland plants in western Montana to determine if and when suppre ...


Invasive Plant Erodes Bird Song Diversity via Food Chain Effects

Although plant invaders are known for their negative effects on natural systems, the extent of these impacts is often unknown. Forest Service s ...


Invasiveness and Impact of 48 Exotic Plant Species in Native Grasslands

This study quantified and ranked invasiveness and impact for 48 exotic plant species based on surveys over 20,000 square kilometers (12,427 squa ...


The Bane of Weed Management: Secondary Invasions

Weed management can result in unintentional secondary invasion: an increase in non-target exotics following efforts to suppress targeted invasiv ...


The tortoise and the hare: Can the slow native plant win?

It has been suggested that exotic plants will be more successful than native plant species as a result of climate change. This is because exotic ...


Last updated on : 05/17/2021