Now showing items 1-6 of 6
Barred Owls and Northern Spotted Owls in the Eastern Cascade Range, Washington
Competitive interactions with barred owls (Strix varia) are an important factor contributing to the observed decline in the northern spotted owl (Strix occidentallis caurina) population in Washington. My goal was to develop an understanding of barred owl habitat associations at spatial scales corresponding to home ranges and ...
Effects of local vegetation and landscape patterns on avian biodiversity in the threatened oak habitat of the Willamette Valley, Oregon
Both fine scale patterns of vegetation and coarser scale landscape patterns affect bird community composition and structure. However, the relative importance of the drivers at these two spatial scales continues to be debated. Here, we show how the factors that drive avian diversity and community structure depend on context, ...
Identification Of Habitat Controls On Amphibian Populations: The Northern Red-Legged Frog In The Pacific Northwest
Historically, research addressing vulnerability of stillwater-breeding amphibians focused on reproductive (aquatic) habitat. However, in the Pacific Northwest (PNW), terrestrial (active-season) habitat is also important to many stillwater-breeding amphibians though its importance has rarely been evaluated. Locally, these ...
Eastern Gray Squirrel Ecology and Interactions with Western Gray Squirrels
Populations of State-threatened western gray squirrels (<italic>Sciurus griseus</italic>) have declined in areas invaded by introduced eastern gray squirrels (<italic>S. carolinensis</italic>) in the Western United States, but little is known about competitive interactions between these species. The western gray squirrel is ...
Estimating the Economic Benefits of a Mt St Helens Wolf Population: a Cost Benefit Analysis Using Benefit Transfer
It has been almost 20 years since the US Fish and Wildlife Service reintroduced wolves to Yellowstone and central Idaho, yet the controversy surrounding wolves in the western US remains as fierce as ever. Meanwhile, wolf populations across MT, WY, ID, and even WA have grown to the point where many states are shifting their ...
Using non-invasive techniques to examine black bear (Ursus americanus) abundance in the North Cascades Ecosystem, Washington State
Recent advances in non-invasive research methods have facilitated less costly evaluations of bear populations across wide geographic ranges. Non-invasive hair-snagging and genetic tagging allow identification of species, sex, and individual bears without necessitating direct capture or observation. From 2008 to 2011 a large, ...