Publications
Filter Total Items: 1978
Rotifer abundance and distribution in the northern Cascade Mountains, Washington, USA
No abstract available.
Authors
E. Deimling, W.J. Liss, G.L. Larson, R. Hoffman, G.A. Lomnicky
Shorebird-prey interactions in South Carolina coastal soft-sediments
We investigated the simultaneous influence of benthic prey (primarily insect larvae, oligochaetes, and polychaetes) on spring-migrating shorebirds (Charadriiformes) and shorebirds on prey in brackish managed wetlands of South Carolina. We proposed that positive correlations between shorebird and prey densities and between prey reduction and shorebird density might result in a negative feedback loo
Authors
Louise M. Weber, Susan M. Haig
Effects of road management on movement and survival of Roosevelt elk
Road closures frequently are used to manage for Rocky Mountain elk (Cervus elaphus nelsoni), but no studies have evaluated the effects of limited vehicle access on movements and survival of Roosevelt elk (C. elaphus roosevelti). We studied movements and survival of female Roosevelt elk before Road Management Areas (RMA) were designated, and during limited vehicular access from 1991 to 1995. The Bu
Authors
Eric Cole, Michael D. Pope, Robert G. Anthony
Effects of drought and prolonged winter on Townsend's ground squirrel demography in shrubsteppe habitats
During a mark–recapture study of Townsend's ground squirrels (Spermophilus townsendii) on 20 sites in the Snake River Birds of Prey National Conservation Area, Idaho, in 1991 through 1994, 4407 animals were marked in 17639 capture events. This study of differences in population dynamics of Townsend's ground squirrels among habitats spanned a drought near the extreme of the 130-yr record, followed
Authors
Beatrice Van Horne, Gail S. Olson, Robert L. Schooley, Janelle G. Corn, Kenneth P. Burnham
Disturbance of biological soil crusts: Impacts on potential wind erodibility of sandy desert soils in southeastern Utah
Friction threshold velocities (FTVs) were determined for biological soil crusts in different stages of recovery. Particles on the surface of crusts that had been relatively undisturbed for at least 20 years were found to have significantly higher FTVs than those that had been disturbed 5, 10 or 1 years previously (376, 87, and 46 cm sec-1 , respectively). FTV's for crust breakage was also much hig
Authors
J. Belnap, Dale A. Gillette
Nitrogen metabolism of sheep and goats consuming Acacia brevispica and Sesbania sesban
We described the effects of two East African browses, Acacia brevispica and Sesbania sesban, on nitrogen metabolism of sheep and goats. The A. brevispica had a substantial amount of proanthocyanidins (condensed tannins); S. sesban did not. The browses were fed at three levels in combination with vetch (Vicia dasycarpa) and teff straw (Eragrostis abyssinica). Fecal N, N balance, and plasma urea N (
Authors
A. Woodward, J.D. Reed
Characteristics of nesting areas used by San Clemente Island Sage Sparrows
I examined the nest habitat used by Sage Sparrows (Amphispiza belli clementeae) on San Clemente Island, one of the California Channel Islands, during March through June 1986. All nests were found in boxthorn shrubs in coastal scrub habitat. The cover of vegetation was greater and more evenly distributed at nest sites than in surrounding habitat. Nests were placed most often on the leeward side of
Authors
David W. Willey
Wildlife response to thinning young forests in the Pacific Northwest
No abstract available.
Authors
J. P. Hayes, S.S. Chan, W.H. Emmingham, J. C. Tappeiner, L.D. Kellogg, J. D. Bailey
Population identification of western hemisphere shorebirds throughout the annual cycle
Identification of relationships among geographically distinct populations of migratory species can provide an understanding of breeding and natal philopatry, migration pathways, and population mixing during winter. We used random amplified polymorphic DNA (RAPD) analyses to search for markers specific to difficult‐to‐differentiate shorebird species (e.g. long‐billed dowitcher Limnodromus scolopace
Authors
Susan M. Haig, C. L. Gratto-Trevor, Thomas D. Mullins, M. A. Colwell
Gradients, vegetation and climate: spatial and temporal dynamics in the Olympic Mountains, USA
The steep environmental gradients of mountains result in the juxtaposition of diverse vegetation associations with narrow ecotones because life zones are compressed. Variation in geologic substrate, landforms, and soils, in combination with steep environmental gradients, create habitat diversity across spatial scales from 106 ha to <10 m2. This leads to higher biodiversity in a smaller space than
Authors
David L. Peterson, Edward G. Schreiner, Nelsa M. Buckingham
Effectiveness of artificial nesting structures for Ferruginous Hawks in Wyoming
No abstract available.
Authors
James R. Tigner, Mayo W. Call, Michael N. Kochert