Publications
Below is a list of available NOROCK peer reviewed and published science. If you are in search of a specific publication and cannot find it below or through a search, please contact twojtowicz@usgs.gov.
Filter Total Items: 1357
Predicting rare plant occurrence in Great Smoky Mountains National Park, USA Predicting rare plant occurrence in Great Smoky Mountains National Park, USA
We investigated the applicability of biometric habitat modeling to rare plant inventory and conservation by developing and field testing a geographically explicit model for Cardamine clematitis Shuttleworth ex A. Gray (mountain bittercress), an endemic plant of the southern Blue Ridge Mountains, USA. For each of 187 confirmed coordinates for C. clematitis in Great Smoky Mountains...
Authors
John R. Boetsch, Frank T. van Manen, Joseph D. Clark
Pleistocene glaciations of the Rocky Mountains Pleistocene glaciations of the Rocky Mountains
This chapter presents the status of Rocky Mountain glacial studies in 1965 and progress from that time to the present. The Rocky Mountains and the adjacent Basin and Range of the United States consist of about 100 ranges distributed in a northwest trending belt 2,000 km long and 200–800 km wide. In 1965, Rocky Mountain glacial subdivisions and correlations are closely linked with those...
Authors
Kenneth L. Pierce
Grizzly bear Ursus arctos Grizzly bear Ursus arctos
No abstract available.
Authors
C.C. Schwartz, S.D. Miller, M.A. Haroldson
Mitochondrial phylogeography of moose (Alces alces) in North America Mitochondrial phylogeography of moose (Alces alces) in North America
Nucleotide variation was assessed from the mitochondrial control region of North American moose (Alces alces) to test predictions of a model of range expansion by stepping-stone dispersal and to determine whether patterns of genetic variation support the current recognition of 4 subspecies. Haplotypes formed a star phylogeny indicative of a recent expansion of populations. Values of...
Authors
Kris J. Hundertmark, R. Terry Bowyer, Gerald F. Shields, Charles C. Schwartz
Use of sulfur and nitrogen stable isotopes to determine the importance of whitebark pine nuts to Yellowstone grizzly bears Use of sulfur and nitrogen stable isotopes to determine the importance of whitebark pine nuts to Yellowstone grizzly bears
Whitebark pine (Pinus albicaulis) is a masting species that produces relatively large, fat- and protein-rich nuts that are consumed by grizzly bears (Ursus arctos horribilis). Trees produce abundant nut crops in some years and poor crops in other years. Grizzly bear survival in the Greater Yellowstone Ecosystem is strongly linked to variation in pine-nut availability. Because whitebark...
Authors
L.A. Felicetti, C.C. Schwartz, R. O. Rye, M.A. Haroldson, K.A. Gunther, D.L. Phillips, C.T. Robbins
Hatching success in salamanders and chorus frogs at two sites in Colorado, USA: Effects of acidic deposition and climate Hatching success in salamanders and chorus frogs at two sites in Colorado, USA: Effects of acidic deposition and climate
The snowpack in the vicinity of the Mount Zirkel Wilderness Area is among the most acidic in the western United States. We analyzed water chemistry and examined hatching success in tiger salamanders and chorus frogs at ponds there and at nearby Rabbit Ears Pass (Dumont) to determine whether acid deposition affects amphibians or their breeding habitats at these potentially sensitive...
Authors
E. Muths, K. Campbell, P.S. Corn
Feedback-driven response to multidecadal climatic variability at an alpine treeline Feedback-driven response to multidecadal climatic variability at an alpine treeline
The Pacific Decadal Oscillation (PDO) has significant climatological and ecological effects in northwestern North America. Its possible effects and their modification by feedbacks are examined in the forest-tundra ecotone in Glacier National Park, Montana, USA. Tree ring samples were collected to estimate establishment dates in 10 quadrats. Age-diameter regressions were used to estimate...
Authors
K.J. Alftine, G.P. Malanson, D.B. Fagre
Status of native fishes in the western United States and issues for fire and fuels management Status of native fishes in the western United States and issues for fire and fuels management
Conservation of native fishes and changing patterns in wildfire and fuels are defining challenges for managers of forested landscapes in the western United States. Many species and populations of native fishes have declined in recorded history and some now occur as isolated remnants of what once were larger more complex systems. Land management activities have been viewed as one cause of...
Authors
B. Rieman, D. Lee, D. Burns, Robert E. Gresswell, M. Young, R. Stowell, J. Rinne, P. Howell
Fire and aquatic ecosystems of the western USA: Current knowledge and key questions Fire and aquatic ecosystems of the western USA: Current knowledge and key questions
Understanding of the effects of wildland fire and fire management on aquatic and riparian ecosystems is an evolving field, with many questions still to be resolved. Limitations of current knowledge, and the certainty that fire management will continue, underscore the need to summarize available information. Integrating fire and fuels management with aquatic ecosystem conservation begins...
Authors
P.A. Bisson, B. Rieman, C. Luce, Paul F. Hessburg, D. Lee, J. Kershner, G.H. Reeves, Robert E. Gresswell
Introduction to the effects of wildland fire on aquatic ecosystems in the Western USA Introduction to the effects of wildland fire on aquatic ecosystems in the Western USA
The management of wildfire has long been controversial. The role of fire and fire-related management in terrestrial and aquatic ecosystems has become an important focus in recent years, but the general debate is not new. In his recent book, Stephen Pyne (2001 )describes the political and scientific debate surrounding the creation of the U.S. Forest Service and the emergence of fire...
Authors
B. Rieman, Robert E. Gresswell, M. Young, C. Luce
Patterns of apparent extirpation among isolated populations of pikas (Ochotona princeps) in the Great Basin Patterns of apparent extirpation among isolated populations of pikas (Ochotona princeps) in the Great Basin
We conducted exploratory analyses to examine the relative roles played by natural and anthropogenic influences on persistence of a montane mammal. We revisited historical locations of pikas (Ochotona princeps) within the hydrographic Great Basin during summers of 1994-1999. Seven of 25 populations (28%) reported earlier in the 20th century appeared to have experienced recent extirpations...
Authors
Erik A. Beever, P. F. Brussard, Joel Berger
Large wood recruitment and redistribution in headwater streams in the southern Oregon Coast Range, U.S.A Large wood recruitment and redistribution in headwater streams in the southern Oregon Coast Range, U.S.A
Large wood recruitment and redistribution mechanisms were investigated in a 3.9 km2 basin with an old-growth Pseudotsuga menziesii (Mirb.) Franco and Tsuga heterophylla (Raf.) Sarg. forest, located in the southern Coast Range of Oregon. Stream size and topographic setting strongly influenced processes that delivered wood to the channel network. In small colluvial channels draining steep...
Authors
Christine L. May, Robert E. Gresswell