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Ruderal Grasslands and Streaked Horned Lark Reserves in the Willamette Valley: Reviving a Unique Ecosystem and Recovering an Imperiled Pacific Northwest Bird
The loss of annual natural mechanisms to maintain ruderal grassland habitat in the Willamette Valley has been a primary factor in the decline and listing of the Streaked Horned Lark as a Threatened species under the U.S. Endangered Species Act. Extensive efforts to integrate lark conservation and recovery with other land uses have been unsuccessful
Evaluating spatial and temporal trends in ecological indicators at dredged material placement sites
The beneficial use of dredged material (BUDM) is increasing and studies have demonstrated ecological benefits, but confidence among stakeholders continues to lag. Primary hurdles for BUDM practitioners lie in identifying approaches that can assuage local concerns, while adopting general metrics to quantify ecological benefits that are transferable and economically feasible. While controlled experiments will advance
Pesticide Risk Assessment for Streaked Horned Larks: A Review of Pesticides Used in the Willamette Valley, Oregon
Grassland birds are declining faster than birds in any other biome likely due to land conversion, intensification of agriculture practices, and increased inputs of pesticides. The endangered species, Streaked Horned Lark, is a ground-nesting grassland bird that utilizes agriculture land to forage and breed. Willamette Valley houses the largest populations of Streaked Horned Larks within
Evaluating the Effectiveness of Vernal Pools and Swales in Prairie Restoration for Streaked Horned Larks in the Willamette Valley, Oregon 2022-2023
The Streaked Horned Lark (hereafter lark) is an Oregon Conservation Strategy species and a Threatened species under the U. S. Endangered Species Act. Most of its range-wide population (<2,000 birds) occurs in the southern Willamette Valley, Oregon. Larks evolved as an early-successional open landscape-dependent species with a unique niche at the initiation end of the
Mazama Pocket Gopher Survey Report 2024
Washington Department of Fish and Wildlife (WDFW) annually conducts Mazama pocket gopher (Thomomys mazama; gopher) abundance surveys on sites with known gopher inhabitance that are potential reserves under the state and federal gopher recovery plans (Stinson 2020; USFWS 2022). Understanding the estimated abundance and distribution of pocket gophers can inform management actions to minimize negative
Prairie, Oaks, and People – An Investment Strategy
The Prairie, Oaks, and People Investment Strategy offers an action-oriented five-year strategy with $304.2 million of ready-to-implement projects. Developed by partnerships across the Pacific Northwest, this effort brings together tribes, conservation organizations, community groups, private landowners, businesses, and government agencies in a nonpartisan commitment to conserve the oak and prairie landscape while advancing key natural
Oak Pests Fact Sheet
Most of the insects found on oak cause only superficial damage or infest only dying trees. More recently Oregon oaks have been damaged by exotic insects such oak lace bug and Mediterranean oak borer (MOB), the latter of which spreads fungi that can kill oaks. Signs and symptoms of pests and non-pests of oak may
Best Management Practices: Mediterranean Oak Borer
Mediterranean Oak Borer (MOB, Xyleborus monographus) is a recently-detected exotic invasive insect first found in Oregon in 2018. MOB is a tiny woodboring ambrosia beetle that vectors fungi that can kill oak trees. We are still learning about the biology of this insect and associated fungi and studying potential strategies for management. Below is the
Best management practices for mitigating impacts to Oregon white oak priority habitat
This publication provides guidance for offsetting impacts on Oregon white oak habitat when land-use activities are likely to degrade their function as wildlife habitat. It accomplishes this through guidance and direction that helps with: mapping the extent of Oregon white oak woodlands, assessing land-use impacts, providing strategies to avoid, minimize, and compensate for impacts, designing
Douglas-fir encroachment reduces drought resistance in Oregon white oak of northern California
Oregon white oak (Quercus garryana Douglas ex Hook.) is experiencing increasing competition from Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) across much of its range at the same time as climate variability is increasing, including more frequent and extreme droughts. These combined factors suggest that Douglas-fir encroachment is not only leading to range reduction from competition, but