Reports

Reports and documents by IAE staff.  

Seed dormancy in high elevation plants: implications for ecology and restoration

Thomas N. Kaye   1997

Seed germination is a crucial event in the life of every sexually reproduced higher plant. A portion of the seeds of many species are dormant; they do not germinate unless specific environmental signals or events occur. The objective of this research was to determine the extent of seed dormancy in 28 species of grasses and […]

Testing for nativity, competitive, or allelopathic effects in interspecific interactions of Centaurea pratensis (meadow knapweed)

Erin C. Gray and Andrea S. Thorpe   2011

Comparisons of invasive species in their native and introduced ranges are rare, but offer insights into which mechanisms may contribute to their invasion potential in novel environments. Though competition is considered a major mechanism for invasive species success in novel environments, allelopathy (the negative effect of one plant on another through the release of chemical compounds) […]

Controlling meadow knapweed with manual removal, mulching, and seeding

Andrea S. Thorpe, Ph.D. and Rob Massatti   2008

Meadow knapweed (Centaurea pratensis) is an invasive forb that is a fertile hybrid between two European species that are also invasive in the United States. Meadow knapweed is prevalent across Oregon, Washington, Montana, and Idaho. Particularly in western Oregon, populations of meadow knapweed have been rapidly expanding and new infestations are frequently found. Although meadow knapweed appears […]

Toward successful reintroductions: The combined importance of species traits, site quality, and restoration technique

Thomas N. Kaye   2011

Reintroduction of endangered plant species may be necessary to protect them from extinction, provide connectivity between populations, and reach recovery goals under the U.S. Endangered Species Act. But what factors affect reintroduction success? And which matter more: traits inherent to the species, qualities of the site, or reintroduction technique? Here I propose that all three […]

Reintroduction of rare and endangered plants: common factors, questions and approaches

Edward O. Guerrant Jr., and Thomas N. Kaye   2007

The science of reintroduction for conservation purposes is young, and there is still much to learn about the practice. As a means to achieving biological goals of successfully establishing new populations to enhance a species survival prospects, and project goals, such as learning how to go about establishing new populations, reintroduction projects are best done […]

Vital steps toward success of endangered plant reintroductions

Thomas N. Kaye   2008

Reintroduction of endangered plants faces many challenges, but the survival of some species may depend on its success. What measures should practitioners take to ensure a successful project, and how should success be measured? Steps in the reintroduction process include planning and identification of objectives, finding source material, propagation, site selection, site preparation, outplanting, monitoring, […]

Seed transfer zones for a native grass Festuca roemeri

Barbara L. Wilson, et al.   2008

A common-garden study of Festuca roemeri (Pavlick) E. B. Alexeev (Poaceae) revealed substantial genetic variation within and among 47 populations from throughout its range in the Pacific Northwest, US, for growth, fitness, phenological, and morphological traits. Using climatic and physiographic variables, genetic patterns over the landscape were examined through principal component and regression analysis. Elevation […]

The Willamette Valley Seed Increase Program: Developing genetically diverse germplasm using an ecoregion approach

Kimiora Ward, et al.   2008

The goal of the Institute for Applied Ecology’s Willamette Valley Seed Increase Program is to develop a supply of ecologically appropriate, genetically diverse native plant material for restoration of prairie ecosystems in the Willamette Valley. In creating restoration germplasm we seek to maximize genetic diversity while simultaneously protecting genetic integrity of extant native populations. In […]

Polycross populations of the native grass Festuca roemeri as pre-varietal germplasm: their derivation, release, increase, and use

Dale C. Darris, et al.   2008

Results of a recent common-garden study provide evidence needed to delineate appropriate seed transfer zones for the native grass Festuca roemeri (Pavlick) E. B. Alexeev (Poaceae). That information has been used to develop pre-variety germplasm releases to provide ecologically and genetically appropriate seeds for habitat restoration, erosion control, and other revegetation projects in 5 regions […]

Reviving the connection between children and nature: through service-learning restoration partnerships

Jennie R. Cramer   2008

Engaging students in environmental restoration through service-learning partnerships is an effective tool for restoring native ecosystems while simultaneously rebuilding relationships between children and nature and inspiring future stewards of the land. Place-based education provides a framework for connecting students to the land. Stewardship-based service-learning provides a productive means by which to accomplish both education and […]