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An Assessment of Population Status, Limiting Factors, and Conservation Actions for an Oregon Vesper Sparrow Metapopulation in the Willamette Valley, Oregon, 2016-2023

Oregon Vesper Sparrow is one of the most imperiled birds in North America. It has been designated as a bird of high conservation concern and vulnerability by all natural resource entities within its breeding and wintering range and is currently being reviewed by the U.S. Fish and Wildlife Service for listing under the Endangered Species

Streaked horned lark abundance and trends for the Puget lowlands and the lower Columbia River/Washington Coast, 2010-2023

2024 Research Progress Report summarizing streaked horned lark (SHLA) abundance and trends for the Puget lowlands and the lower Columbia River/Washington Coast through the 2023 field season. Abundance estimates for individuals sites (accounting for year and sex) can be found in the table at the end of the report.

Mt Hood National Forest: Fire behavior and forest conditions inferred from early surveys and inventories

Restoring the structure, function, and resilience of fire prone forests is a major goal of federal forest managers and their partners. Historical fire regimes guide contemporary restoration efforts by identifying where the exclusion of fires and other management activities including historical tree harvest practices and grazing have increased fuel loading, the proportion of fire-sensitive tree

Continued response of Oregon oak to release treatments 20 years after initiation in western Washington, United States

Fire suppression has increased competitive tree encroachment of Oregon white oak (Quercus garryanna Douglas ex Hook) ecosystems, threatening maintenance of this important species. Restoration of oak ecosystems is ideal to address this threat but not always possible, giving rise to a need for novel treatments that will allow oak to persist on an altered landscape.

Resilience of Oregon white oak to reintroduction of fire

Background: Pacific Northwest USA oak woodlands and savannas are fire-resilient communities dependent on frequent, low-severity fire to maintain their structure and understory species diversity, and to prevent encroachment by fire-sensitive competitors. The re-introduction of fire into degraded ecosystems is viewed as essential to their restoration, yet can be fraught with unintended negative consequences. We examined

The growth-climate relationship of Oregon white oak (Quercus garryana)

This thesis describes the growth-climate relationship of Oregon white oak, a foundation species in one of the most endangered habitat types in North America. These trees inhabit dynamic forest ecosystems in which climate is especially significant and expected to become increasingly important. In this study, we identify characteristic growth responses of Oregon white oak to

Seeding After Fire

Soil stabilization is a primary goal in vegetation management following either wild or prescribed fire. Hot fires which kill perennial herbaceous cover create significant risk for soil erosion and invasion of annual grasses. However, perennial bunchgrasses often survive wildfire and must be encouraged to produce seed in the first two years after a fire. In

Exploring the persistence of Oregon white oak in the Willamette Valley

Over the last 150 years, Oregon white oak habitat in the Willamette Valley has been converted to support grass crops, orchards and vineyards, cities, and conifer forests, nearly extirpating it from the Willamette Valley. Yet Oregon white oak offers many ecosystem services to the Willamette Valley and its residents. Recent and projected climate changes may

Climate change vulnerability and adaptation in southwest Washington

The Southwest Washington Adaptation Partnership (SWAP) was developed to identify climate change issues relevant for resource management in southwest Washington, specifically on Gifford Pinchot National Forest. This science-management partnership assessed the vulnerability of natural resources to climate change and developed adaptation options that minimize negative impacts of climate change on resources of concern and facilitate

Mediterranean Oak Borer

Mediterranean oak borer (MOB) is a tiny brown woodboring insect called an “ambrosia” beetle. Female beetles tunnel into many species of oaks and have recently been found in Oregon infesting Oregon white oak (Quercus garryana). This fact sheet covers current distribution, hosts, pathway, signs and symptoms of infestation, similar damage, control strategies and current efforts.