One goal of this environmental education curriculum is that students will gain an appreciation of
Willamette Valley wetland prairies, a threatened ecosystem, and will gain an understanding of the
importance of protecting these wetlands. A second goal is that students will see first-hand the
processes involved in conducting scientific field...
We report first-year results from two field experiments evaluating the effectiveness of
various techniques for the control of pest plants in Fender's blue butterfly habitat. In the
woody-plant study, we monitored the effects of mowing, mowing and herbicides, and burning
on woody plants and key native and non-native grasses and...
Erigeron decumbens var. decumbens, the Willamette daisy, is known only from
the Willamette Valley of Oregon. Herbarium records, from the 1800's until 1934,
indicate that the Willamette daisy was once common and widely distributed throughout
the Willamette Valley (Clark et al. 1993). However, between 1934 and 1980, this
Erigeron decumbens var. decumbens, the Willamette Daisy, is endemic to the
Willamette Valley of Oregon. This taxon is a Category 1 Candidate for listing under the
federal Endangered Species Act (U.S. Fish and Wildlife Service 1990) and is listed as
Endangered under Oregon state law. Herbarium records indicate that E....
Seed size, abundance, viability, dormancy, and germination requirements strongly
influence plant establishment and therefore are important considerations in restoration of
native vegetation. These characteristics provide criteria for selection of suitable species,
development of collection and pretreatment methods, and determination of seeding densities. The first set of objectives of this study...
Native prairies, which once dominated the landscape of the Willamette Valley, are
considered among the rarest of Oregon's ecosystems. Even though only remnants remain
today, they harbor rare and endangered species such as the Fender's blue butterfly
(Icaricia icariodes fenderi) and its preferred host plant, Kincaid's lupine (Lupinus
We report results from a field experiment evaluating the effectiveness of mowing,
mowing and herbicides, and burning on woody plants, key native and non-native grasses and
forbs, and the Fender's blue butterfly. The goal was to find a technique that controlled woody
pest plants without harming native species or promoting...
Explaining restoration failure can be as important as touting success. We used a series of
studies to understand the failure of techniques commonly used to restore wetland prairies in the Willamette
Valley of western Oregon. Burning, fallowing, and solarization (covering tilled plots with plastic
sheeting to heat the soil) had...
We report results from a field experiment evaluating the effectiveness of mowing, mowing and herbicides, and burning on woody plants, key native and non-native grasses and forbs, and the Fender’s blue butterfly. The goal was to find a technique that controlled woody pest plants without harming native species or promoting...
We report final results from a five-year field experiment evaluating the effects of different
mowing regimes on groups of native and non-native grasses and forbs. The study site was
a degraded prairie at Baskett Slough National Wildlife Refuge dominated by the pest plant
Arrhenatherum elatius (tall oatgrass). Mowing treatments differed...