Mission Areas L2 Landing Page Tabs
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.
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.
Salamanders and introduced fish in mountain lakes of two Pacific Northwest parks
No abstract available.Larson, Gary L.; Hoffman, Robert L.
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.
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.
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.
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.
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.
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
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.
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.
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.