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Limiting factors for the Oregon Vesper Sparrow population in the Rogue Basin, Oregon: 2018-2021 summary report

The Oregon Vesper Sparrow has been petitioned for listing under the Endangered Species Act because of its small population size and declining trend. Breeding Bird Surveys indicate a statistically significant declining population trend of ~5% per year. The 2010 estimated range-wide population size was <3,000 birds, and more recent information suggests that number is closer

Limiting factors for the Oregon Vesper Sparrow population in the Rogue Basin, Oregon: 2022-2023 summary report

The Oregon Vesper Sparrow is under review for listing via the Endangered Species Act because of its small population size and declining trend. Breeding Bird Surveys indicate a significantly declining population trend of ~5% per year. The 2010 estimated range-wide population size was <3,000 birds, and more recent information suggests that number is closer to

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