Reports and documents by IAE staff.  

Conservation and reintroduction of the endangered Willamette daisy

Andrea S. Thorpe and Thomas N. Kaye   2011

Our research suggests that habitat fragmentation and reduced population size in Willamette daisy has led to loss of fitness in some populations and to population differentiation. In outcrossing species, habitat fragmentation and reduced population size can lead to increased genetic drift, local adaptation, and (or) inbreeding. We explored some of these issues for the endangered […]

Upland Prairie Restoration Research at Wild Iris Ridge

Erin C Gray, et al.   2012

This project aims to identify and test best practices for upland prairie restoration in the Willamette Valley where management tools (such as prescribed burning) might be limited. Sites along Wild Iris Ridge were selected to receive site preparation treatments followed by management treatments based on the methods of several long-term restoration projects in the Willamette Valley and Puget Trough. In March 2010, we established […]

Maxfield Meadows meadow and oak savannah restoration

Sarah Bois, et al.   2012

Maxfield Meadows is a 370 acre parcel composed of Douglas-fir (Pseudotsuga menziesii) forest, Oregon white oak (Quercus garryana) woodland, and meadows managed by the Salem District BLM. Restoration of this site was initiated in 2007. Restoration goals include improving oak woodland and savannah habitat and controlling invasive species (primarily false-brome, Brachypodium sylvatium). The Institute for […]

Demography and management of Willamette Daisy (Erigeron decumbens)

Denise E. L. Giles-Johnson   2013

The goal of this project is to combine careful demographic studies with experimental habitat management treatments in order to provide information on effective management of the endangered Willamette daisy (Erigeron decumbens ssp. decumbens). Specifically, we wish to assess the efficacy of various management techniques that will reduce the cover of invasive and woody plant species while […]

Introduction of Willamette daisy to E4

Andrea S. Thorpe   2010

In this report we summarize grow-out and planting methods and first year survival of introduced Willamette Daisy (Erigeron decumbens ssp. decumbens) planted in 2010 at Finley National Wildlife Refuge. The goal of this project was to plant 1000 E. decumbens in suitable habitat at E4, a site within Finley National Wildlife refuge being restored by […]

Erigeron decumbens spp. decumbens (Willamette daisy): Population monitoring and evaluation of mowing and burning at Oxbow West (West Eugene Wetlands)

Andrea S. Thorpe and Thomas N. Kaye   2007

There are three main objectives of this project. The first is to determine yearly population size and reproduction of the endangered Willamette daisy, E. decumbens ssp. decumbens at Oxbow West. The second objective is to determine if there are long-term trends in population size and reproduction. The final objective of this project is to assess the […]

Minimum population size for reproduction in Willamette daisy

Thomas N. Kaye, et al.   2006

SUMMARY We located and visited 20 populations of Willamette daisy with a range of population sizes (<10 to >4000), representing the majority of remaining locations of this species. We counted all flowering individuals in all populations (or used current population sizes as determined by others), and collected mature flower heads from each population. We determined […]

Population survey and trend assessment for Eucephalus vialis at Beatty Creek ACEC

Denise E. L. Giles-Johnson, et al.   2010

The primary objective of this study is to determine long-term population trends of E. vialis (AKA Aster vialis) at Beatty Creek. In 2009, the Institute for Applied Ecology (IAE) surveyed Beatty Creek ACEC to determine the size of the E. vialis population. We used this information to design a long-term monitoring protocol and conduct population monitoring. This […]

Experimental habitat manipulation of wayside aster (Eucephalus vialis)

Rachel E. Newton, et al.   2010

Eucephalus vialis, wayside aster, is an herbaceous perennial known only from Lane and Douglas Counties in Oregon. It is listed as a State Threatened species, a Species of Concern by the U.S. Fish and Wildlife Service (ORBIC 2010), and is classified as Bureau Sensitive in Oregon under a Draft Bureau of Land Management (BLM) Special […]

Assessment of seedling failure in peripheral populations of Umpqua green gentian (Frasera umpquaensis)

Denise E. L. Giles-Johnson and Andrea S. Thorpe   2010

Frasera umpquaensis is a long-lived perennial that may live up to 80 years (Kaye 2001). Most populations are found along the Rogue-Umpqua divide. This report describes activities at five sites in peripheral populations along the Calapooya divide; Sourgrass Mountain, Sourgrass Mountain Southeast, Elk Meadows, Elk Camp Shelter and Nevergo. Seedling recruitment at these sites had […]