I used a comparative and experimental approach to examine nest habitat
selection, reproductive success, and nest site fidelity of burrowing owls (Athene
cunicularia) in a large, non-fragmented grassland in southwest California. In 1999,
I compared habitat characteristics between nest sites (n = 31) and randomly
selected, unoccupied burrows (n =...
Small remnants of 'natural' habitats exist today throughout much of the world. Upland
prairies in the Willamette Valley, Oregon have been nearly eliminated by conversion to
agriculture and other uses. As a result, very few prairies remain and at least four butterfly
species that require this habitat appear to be...
The Humboldt marten, Martes americana humboldtensis, has undergone a dramatic
decline throughout its historical distribution in coastal Northwestern California. There
is currently only one known population occupying an area occurring in <5% of the
historical distribution of the subspecies. Conservation and management efforts to
benefit this population are hampered by...
The hump-shaped relationship that predicts highest species richness (species/unit area) at intermediate levels of productivity was examined for woody plants across the Pacific and Inland Northwest of the U.S. Many studies have examined this relationship at regional scales, but commonly use species range maps and surrogate measures of productivity (e.g....
We evaluated the effects of herbage removal from livestock grazing on
Oregon spotted frog (Rana pretiosa) habitat use by monitoring frog locations in
grazed and matched ungrazed treatments across a range of grazing intensities at
Jack Creek, Fremont-Winema National Forest, Oregon. Thirteen cattle exclosures
were deployed along Jack Creek in...