Publications
Filter Total Items: 1990
Effects of constant and cyclical thermal regimes on growth and feeding of juvenile cutthroat trout of variable sizes
The effects of constant (12, 18, and 24 °C) and cyclical (daily variation of 15–21 and 12–24 °C) thermal regimes on the growth and feeding of Lahontan cutthroat trout (Oncorhynchus clarki henshawi) of variable sizes were examined. Higher constant temperatures (i.e., 24 °C) and more variable daily temperatures (i.e., 12–24 °C daily cycle) negatively affected growth rates. As fish mass increased (fr
Authors
M.H. Meeuwig, J. B. Dunham, J. P. Hayes, G.L. Vinyard
The case for regime-based water quality standards
Conventional water quality standards have been successful in reducing the concentration of toxic substances in US waters. However, conventional standards are based on simple thresholds and are therefore poorly structured to address human-caused imbalances in dynamic, natural water quality parameters, such as nutrients, sediment, and temperature. A more applicable type of water quality standarda??a
Authors
Geoffrey C. Poole, J. B. Dunham, D.M. Keenan, S.T. Sauter, D.A. McCullough, Christopher Mebane, Jeffrey C. Lockwood, Don A. Essig, Mark P. Hicks, Debra J. Sturdevant, E.J. Materna, M. Spalding, John Risley, Marianne Deppman
Interannual variability in aboveground tree growth in Stehekin River watershed, North Cascade Range, Washington
Many forests in the Pacific Northwest region of North America are both highly productive and sensitive to climate. The combination of productivity and sensitivity makes forests vulnerable to changes in future climate and most likely to feed back to the regional carbon cycle. We reconstructed basal area increment (BAI) for 20 yr using tree-ring increments and diameter to identify species-specific r
Authors
Amy E. Hessl, D. L. Peterson
A video surveillence system for monitoring raptor nests in a temperate rainforest environment
No abstract available.
Authors
S.B. Lewis, P. DeSimone, K. Titus, Mark R. Fuller
A comparison of three methods for assessing raptor diet during the breeding season
Video recording of prey deliveries to nests is a new technique for collecting data on raptor diet, but no thorough comparison of results from traditional methods based on collections of prey remains and pellets has been undertaken. We compared data from these 3 methods to determine relative merits of different methods for assessing raptor diet as part of a study of the breeding-season diet of nort
Authors
S.B. Lewis, Mark R. Fuller, K. Titus
Subspecific relationships and genetic structure in the spotted owl
Hierarchical genetic structure was examined in the three geographically-defined subspecies of spotted owl (Strix occidentalis) to define relationships among subspecies and quantify variation within and among regional and local populations. Sequences (522 bp) from domains I and II of the mitochondrial control region were analyzed for 213 individuals from 30 local breeding areas. Results confirmed s
Authors
Susan M. Haig, E.D. Forsman, Thomas D. Mullins
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 (Δ̄N) were calculated for A. gracile larvae/neotene and egg mass relative abundances in the Fish Removal and an
Authors
Robert L. Hoffman, Gary L. Larson, B. Samora
Salamanders and introduced fish in mountain lakes of two Pacific Northwest parks
No abstract available.
Authors
Gary L. Larson, Robert L. Hoffman
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), Federated States of Micronesia. Additionally, aviarie
Authors
Dylan C. Kesler, Susan M. Haig
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 regimes that will promote diversity, managers need more
Community- and landscape-level responses of reptiles and small mammals to feral-horse grazing in the Great Basin
We investigated species- and community-level responses of squamate reptiles and granivorous small mammals to feral-horse grazing in two elevational strata across nine mountain ranges of the western Great Basin, USA. Although mammal species richness did not differ between horse-occupied and horse-removed sites, occupied sites possessed less community completeness (biotic integrity) and 1.1–7.4 time
Authors
Erik A. Beever, P. F. Brussard