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Creator:: Clark, Deborah Louise, 1950-
Abstract:: Native prairies, which once dominated the landscape of the Willamette Valley, are considered among the rarest of Oregon's ecosystems and are in critical need of conservation. One of the largest remaining parcels of native upland prairie, Butterfly Meadows (Benton County), is being invaded by Brachypodium sylvaticum (false brome). This site...
Resource Type:: Technical Report
Full Text:: Prepared by Deborah Clark Department of Botany and Plant Pathology Oregon State University

Creator:: Clark, Deborah Louise, 1950-
Abstract:: Erigeron decumbens var. decumbens, known only from the Willamette Valley of western Oregon, is listed as Endangered by the U.S. Fish and Wildlife Service and by the state of Oregon. In 1993 a long-term population monitoring program for Erigeron decumbens var. decumbens was initiated at Baskett Slough National Wildlife Refuge...
Resource Type:: Technical Report
Full Text:: VALLEY, OREGON 1999 Field Studies Prepared by Deborah L. Clark

Creator:: Clark, Deborah Louise, 1950-
Abstract:: Wetland prairies of the Willamette Valley, among the rarest of Oregon’s ecosystems, are threatened by invasion of woody species and non-native pest species. Because fire has been important in maintaining Willamette Valley prairies for at least 1000 years, prescribed burning is a top choice of managers for preventing encroachment of...
Resource Type:: Technical Report
Full Text:: -2001 Prepared by Deborah L. Clark Submitted to Coast

Creator:: Clark, Deborah Louise, 1950-
Abstract:: We sought to determine 1) the relationship between seedling establishment rates of target native prairie species and field levels of three soil nutrients (phosphate, nitrate, and ammonium) recorded in fall, winter, and summer, 2) the effect of fire on these three nutrients, and 3) the overall effect of fire on...
Resource Type:: Poster
Full Text:: Establishment of Native Prairie Species Clark, D.L., Wilson, M.V. & *Nelson, M.A. Oregon State University and

Creator:: Clark, Deborah L., Wilson, Mark V., and Clark, Deborah Louise, 1950-
Abstract:: Wetland prairies of the Willamette Valley, considered among the rarest of Oregon’s ecosystems, are threatened by invasion of woody species and non-native species. Because of its historical importance, fire is a top choice of managers for preventing the encroachment of woody species. However, the effects of prescribed burning on present...
Resource Type:: Technical Report
Full Text:: Prairie Plant Species FINAL REPORT Prepared by Deborah L. Clark and Mark V

Creator:: Clark, Deborah Louise, 1950- and Wilson, Mark V.
Abstract:: Willamette Valley wetland and upland prairies are some of the most endangered ecosystems in the United States, and provide habitat for many federally listed species. Because these are dynamic systems, subject to ecological succession and invasion by aggressive non-native species, prairies require active management to maintain management goals. This is...
Resource Type:: Technical Report
Full Text:: ) Order No. HEP040027 Prepared by Deborah L. Clark, Ph.D. Mark V. Wilson, Ph.D

Creator:: Clark, Deborah Louise, 1950- and Wilson, Mark V.
Abstract:: 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 sulphureus ssp....
Resource Type:: Technical Report
Full Text:: Management of Fender's Blue Butterfly Habitats Prepared by Deborah L. Clark and Mark. V. Wilson

Creator:: Wilson, Mark V. and Clark, Deborah Louise, 1950-
Abstract:: Native upland 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 many rare and endangered species such as the Fender's blue butterfly and its host plant, Kincaid’s lupine. Invasion of remnant prairies by...
Resource Type:: Technical Report
Full Text:: Rose in Willamette Valley Upland Prairies Prepared by Mark V. Wilson and Deborah L. Clark

Creator:: Clark, Deborah Louise, 1950- and Wilson, Mark V.
Abstract:: Prepared for US Fish and Wildlife Service Western Oregon NWR Complex and Oregon Natural Heritage Program Portland, Oregon.
Resource Type:: Technical Report
Full Text:: Upland Prairies Prepared by Deborah L. Clark and Mark V. Wilson Department

Creator:: Clark, Deborah Louise, 1950- and Wilson, Mark V.
Abstract:: Wetland prairies of the Willamette Valley, among the rarest of Oregon’s ecosystems, are threatened by invasion of woody species and non-native pest species. Because fire has been important in maintaining Willamette Valley prairies for at least 1000 years, prescribed burning is a top choice of managers for preventing encroachment of...
Resource Type:: Technical Report
Full Text:: CONTROLLLING WOODY VEGETATION IN WETLAND PRARIES 1994-1999 Prepared by Deborah L. Clark

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