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234 results found
Songbird populations can be related to habitat components by a method that allows the simultaneous determination of habitat requirements for a variety of species . Through correlation and multiple-regression analyses, 10 bird species were studied in a suburban habitat, which was stratified…
Author(s): Jack Ward Thomas, Richard M. DeGraaf, Joseph C. Mawson
Keywords: habitat, birds
Source: Res. Pap. NE-357. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 15p.
Year: 1977
Recent studies indicate that forest roads may affect the distribution of forest-dwelling birds. However, previous studies have not demonstrated any significant effects of forest roads on avian productivity. We studied the effect of maintained and unmaintained forest roads on (1) forest bird nest…
Author(s): David I. King, Richard M. DeGraaf
Keywords: Edges, habitat, microclimate, nest success, Seiurus aurocapillus
Source: Forest Science. 48(2): 391-396.
Year: 2002
Wilderness is a source habitat for grizzly bear (Ursus arctos) and bull trout (Salvelinus confluentus) populations in the northern Rocky Mountains of the United States, helping sustain these indicators of ecosystem health. The spatial distribution of grizzly bear mortalities has changed since the…
Author(s): Mike Bader
Keywords: Ursus arctos, Salvelinus confluentus, wilderness, habitat, ecosystems, restoration, population viability, metapopulations, source sink relationships, Rocky Mountains
Source: In: McCool, Stephen F.; Cole, David N.; Borrie, William T.; O’Loughlin, Jennifer, comps. 2000. Wilderness science in a time of change conference—Volume 2: Wilderness within the context of larger systems; 1999 May 23–27; Missoula, MT. Proceedings RMRS-P-15-VOL-2. Ogden, UT: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 99-110
Year: 2000
This paper summarizes the ecological effects of fenced habitat protection for the desert tortoise (Gopherus agassizii) at the Desert Tortoise Research Natural Area in the Mojave Desert. The following were higher inside than outside the natural area: (1) annual and perennial plant biomass, cover,…
Author(s): Matthew L. Brooks
Keywords: wilderness, Gopherus agassizii, desert tortoise, protection, fences, habitat, diversity, Mojave Desert, California
Source: In: McCool, Stephen F.; Cole, David N.; Borrie, William T.; O’Loughlin, Jennifer, comps. 2000. Wilderness science in a time of change conference—Volume 3: Wilderness as a place for scientific inquiry; 1999 May 23–27; Missoula, MT. Proceedings RMRS-P-15-VOL-3. Ogden, UT: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 68-73
Year: 2000
Microclimate is the suite of climatic conditions measured in localized areas near the earth's surface (Geiger 1965). These environmental variables, which include temperature, light, windspeed, and moisture, have been critical throughout human history, providing meaningful indicators for habitat…
Author(s): Jiquan Chen, Sari C. Saunders, Thomas R. Crow, Robert J. Naiman, Kimberley D. Brosofske, Glenn D. Mroz, Brain L. Brookshire, Jerry F. Franklin
Keywords: Microclimate, forest ecosystem, landscape ecology, wildlife, habitat, environmental variables
Source: Bioscience. Vol. 49 no. 4.:p. 288-297. (1999)
Year: 1999
We determined population trends and habitat occurrences for bird species in 14 national forests located in the Southern Region from 1992-2004. We estimated population trends for 144 species within: 14 national forests, 10 physiographic areas, and in the Southern Region as a whole. Habitat…
Author(s): Frank A. La Sorte, Frank R., III Thompson, Margaret K. Trani, Timothy J. Mersmann
Keywords: avian populations, habitat, indicator species, southeastern United States
Source: Gen. Tech. Rep. NRS-9. Newton Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 260 p.
Year: 2007
We used three approaches to assess potential effects of climate change on birds of the Northeast. First, we created distribution and abundance models for common bird species using climate, elevation, and tree species variables and modeled how bird distributions might change as habitats shift.…
Author(s): N.L. Rodenhouse, S.N. Matthews, K.P. McFarland, J.D. Lambert, L.R. Iverson, A. Prasad, T.S. Stillett, R.T. Holmes
Keywords: Bicknell's thrush, Catharus bicknelli, bird species modeling, climate change, black-throated blue warbler, Dendroica caerulescens, habitat, high elevation, Northeast, northern hardwoods, spruce-fir, random forests
Source: Mitigation and Adaptation Strategies for Global Change. 13: 487-516.
Year: 2008
Habitat use by rainbow trout Oncorhynchus mykiss is described for a southern California stream where the summer water temperatures typically exceed the lethal limits for trout (>25) C). During August 1994, water temperature, dissolved oxygen (DO), and trout distribution were monitored in two…
Author(s): K.R. Matthews, N.H. Berg
Keywords: rainbow trout, Oncorhynchus mykiss, dissolved oxygen, water temperature, environmental stresses, southern California, habitat, abiotic factors
Source: Journal of Fish Biology 50:50-67.
Year: 1997
Data from hardwood stands in New Hampshire substantiated the crown-width relationships used to develop the B-line (based on circular crowns) in the 1969 northern hardwood stocking guide, and produced an A-line slightly lower than the original line. Position of the A-line was unrelated to site or…
Author(s): William B. Leak
Keywords: Stocking, growth, habitat, site, northern hardwoods
Source: Res. Pap. NE-523. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiement Station. 11p.
Year: 1983
A large-scale operational study has been undertaken to investigate variable density management in conjunction with riparian buffers as a means to accelerate development of late-seral habitat, facilitate rare species management, and maintain riparian functions in 40-70 year-old headwater forests in…
Author(s): Samuel Chan, Paul Anderson, John Cissel, Larry Lateen, Charley Thompson
Keywords: density management, thinning, riparian reserves, buffers, npland forests, habitat, microclimate, headwater
Source: Forest Snow and Landscape Research. 78(1/2): 151-172
Year: 2004