Mission Areas

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Filter Total Items: 2,896
Year Published: 2004

Populations dynamics of red brome (Bromus madritensis subsp. Rubens): Times for concern, opportunities for management

Red brome is a Mediterranean winter annual grass that has invaded south-western USA deserts. Unlike native annuals, it does not maintain a soil seed bank, but exhibits early and uniform germination. Above-average winter precipitation in these regions allows red brome to reach high density and biomass. These are time for concern, as large numbers...

Salo, L.F.
Populations dynamics of red brome (Bromus madritensis subsp. Rubens): Times for concern, opportunities for management; 2004; Article; Journal; Journal of Arid Environments; Salo, L. F.

Year Published: 2004

Responses of Ambystoma gracile to the removal of introduced nonnative fish from a mountain lake

Introduced, nonnative brook trout (Salvelinus fontinalis) were removed from a mountain lake in Mount Rainier National Park, Washington, to examine the capacity of native Ambystoma gracile (Northwestern Salamander) in the lake to respond to the intentional removal of fish. Temporal trends (N) were calculated for A. gracile larvae/neotene and egg...

Hoffman, Robert L.; Larson, Gary L.; Samora, B.
Responses of Ambystoma gracile to the removal of introduced nonnative fish from a mountain lake; 2004; Article; Journal; Journal of Herpetology; Hoffman, Robert L.; Larson, Gary L.; Samora, B.

Year Published: 2004

Salamanders and introduced fish in mountain lakes of two Pacific Northwest parks

No abstract available.

Larson, Gary L.; Hoffman, Robert L.
Salamanders and introduced fish in mountain lakes of two Pacific Northwest parks; 2004; Article; Journal; Park Science; Larson, Gary L.; Hoffman, Robert L.

Year Published: 2004

Seasonal movement and home range of the Mariana Common Moorhen

Adult Mariana Common Moorhens (Gallinula chloropus guami) were radio-marked on Guam (n = 25) and Saipan (n = 18) to determine home range, inter- and intraseasonal space use, and movement patterns among the Mariana Islands of Guam, Saipan, Tinian, and Rota. Birds were tracked throughout the dry and wet seasons in 2000 and 2001. During the dry...

Takano, Leilani L.; Haig, Susan M.
Seasonal Movement and Home Range of the Mariana Common Moorhen; 2004; Article; Journal; The Condor; Takano, L. L.; Haig, Susan M.

Year Published: 2004

Seed and vegetative production of shrubs and growth of understory conifer regeneration

We observed flower and fruit production for nine understory shrub species in western Washington and Oregon and examined the relationships between shrub reproductive output and plant size, plant age, site factors, and overstory density to determine the factors that control flowering or fruiting in understory shrubs. In Washington, 50 or more shrubs...

Wender, B.; Harrington, C.; Tappeiner, J. C.
Seed and vegetative production of shrubs and growth of understory conifer regeneration; 2004; Article; Journal; Northwest Science; Wender, B.; Harrington, C.; Tappeiner, J.C.

Year Published: 2004

Short-term response of songbirds to experimental thinning of young Douglas-fir forests in the Oregon Cascades

Commercial thinning has the potential to increase structural diversity in managed conifer stands and redirect development of young stands towards structure characteristic of late-seral habitats. Thinning to increase diversity, however, is likely to require different strategies than thinning to maximize timber production. To prescribe thinning...

Hagar, Joan C.; Howlin, Shay; Ganio, L.
Short-term response of songbirds to experimental thinning of young Douglas-fir forests in the Oregon Cascades; 2004; Article; Journal; Forest Ecology and Management; Hagar, Joan C.; Howlin, Shay; Ganio, L.

Year Published: 2004

Status of nesting ospreys in coastal Baja California, Sonora, and Sinaloa, Mexico, 1977 and 1992-1993

No abstract available.

Henny, Charles J.; Anderson, Daniel W.
Status of nesting ospreys in coastal Baja California, Sonora, and Sinaloa, Mexico, 1977 and 1992-1993; 2004; Article; Journal; Bulletin Southern California Academy Sciences; Henny, Charles J.; Anderson, Daniel W.

Year Published: 2004

Subspecific relationships and genetic structure in the spotted owl

Most studies using demographic PVA models in a context of species restoration have concluded that rather than the rate of introduction, the total number of individuals released had the most important significant influence on the chance of success. In this article we use a genetic simulation model including deleterious and adaptive alleles to...

Haig, Susan M.; Forsman, E.D.; Mullins, Thomas D.
Subspecific relationships and genetic structure in the spotted owl; 2004; Article; Journal; Conservation Genetics; Haig, Susan M.; Forsman, E. D.; Mullins, Thomas D.

Year Published: 2004

Terrestrial movements of juvenile and adult tailed frogs in relation to timber harvest in coastal British Columbia

Tailed frog (Ascaphus truei Stejneger) populations are at risk in much of the Pacific Northwest, and recolonization of sites may be slow postlogging. To examine the terrestrial movements of Ascaphus in clearcuts and old growth, we employed pitfall traps and drift-fence arrays installed along streams and 100 m into upland habitat. In the fall, we...

Wahbe, Tanya R.; Bunnell, Fred L.; Bury, R. Bruce
Terrestrial movements of juvenile and adult tailed frogs in relation to timber harvest in coastal British Columbia; 2004; Article; Journal; Canadian Journal of Forest Research; Wahbe, Tanya R.; Bunnell, Fred L.; Bury, R. Bruce

Year Published: 2004

The importance of wood in headwater streams of the Oregon Coast Range

Although headwater streams comprise the majority of stream length in mountainous regions, little is known about their form and function in comparison to higher-order rivers. A better understanding of the role of headwater streams in routing water, wood, and sediment is needed to clarify the physical and biological connections among uplands,...

May, Christine; Gresswell, Robert E.; Erickson, Janet L.
The importance of wood in headwater streams of the Oregon Coast Range; 2004; FS; 2004-3055; May, Christine; Gresswell, Robert E.; Erickson, Janet L.

Year Published: 2004

Thermal characteristics of wild and captive Micronesian Kingfisher nesting habitats

To provide information for managing the captive population of endangered Guam Micronesian kingfishers (Halcyon cinnamomina cinnamomina), four biologically relevant thermal metrics were compared among captive facilities on the United States mainland and habitats used by wild Micronesian kingfishers on the island of Pohnpei (H. c. reichenbachii),...

Kesler, Dylan C.; Haig, Susan M.
Thermal characteristics of wild and captive Micronesian Kingfisher nesting habitats; 2004; Article; Journal; Zoo Biology; Kesler, Dylan C.; Haig, Susan M.

Year Published: 2004

Use of radar remote sensing (RADARSAT) to map winter wetland habitat for shorebirds in an agricultural landscape

Many of todays agricultural landscapes once held vast amounts of wetland habitat for waterbirds and other wildlife. Successful restoration of these landscapes relies on access to accurate maps of the wetlands that remain. We used C-band (5.6-cm-wavelength), HH-polarized radar remote sensing (RADARSAT) at a 38A? incidence angle (8-m resolution) to...

Taft, Oriane W.; Haig, Susan M.
Use of radar remote sensing (RADARSAT) to map winter wetland habitat for shorebirds in an agricultural landscape; 2004; Article; Journal; Environmental Management; Taft, Oriane W.; Haig, Susan M.