Publications
FORT scientists have produced more than 2000 peer reviewed publications that are registered in the USGS Publications Warehouse, along with many others prior to their work at the USGS or in conjunction with other government agencies.
Filter Total Items: 2376
The role of landscape and habitat characteristics in limiting abundance of grassland nesting songbirds in an urban open space The role of landscape and habitat characteristics in limiting abundance of grassland nesting songbirds in an urban open space
We examine the relationships between abundance of grassland nesting songbirds observed in the Boulder Open Space, CO, USA and parameters that described landscape and habitat characteristics, in order to provide information for Boulder Open Space planners and managers. Data sets included bird abundance and plant species composition, collected during three breeding seasons (1994–1996), and...
Authors
S. Haire, C.E. Bock, B.S. Cade, B.C. Bennett
Effects of introduced crayfish on selected native fishes of Arizona Effects of introduced crayfish on selected native fishes of Arizona
The virile crayfish (Orconectes virilis), an aggressive polytrophic species, has been introduced into many Arizona streams. I investigated competition and predation between this crayfish and several native Arizona fishes. I conducted field experiments to assess competition for food between crayfish and fish, and laboratory experiments to examine competition for shelter and food, and...
Authors
J. Carpenter
Population growth, fecundity, and survivorship in recovering populations of bighorn sheep Population growth, fecundity, and survivorship in recovering populations of bighorn sheep
The single greatest obstacle to the restoration of large, healthy, populations of bighorn sheep (Ovis canadensis) in the western United States is epizootic outbreaks of bronchopneumonia that may kill 20–100% of the animals in populations. Although the species is capable of rapid initial growth rates following restoration into new habitat (λ = 1.23–1.30 have been observed), these rates of...
Authors
F. J. Singer, E. Williams, M.W. Miller, L. C. Zeigenfuss
Paradigm shifts in theory and methods: regression quantile analysis enables new insights for ecology Paradigm shifts in theory and methods: regression quantile analysis enables new insights for ecology
No abstract available.
Authors
C.E. Bock, Brian S. Cade
Stream chemistry modeling of two watersheds in the Front Range, Colorado Stream chemistry modeling of two watersheds in the Front Range, Colorado
We investigated the hydrologic, geochemical, and biogeochemical controls on stream chemical composition on the Green Lakes Valley and Andrews Creek watersheds using the alpine hydrochemical model (AHM). Both sites had comparable data sets from 1994 and 1996, including high‐resolution spatial data and high‐frequency time series of hydrology, geochemistry, and meteorology. The model of...
Authors
Thomas Meixner, Roger C. Bales, Mark W. Williams, Donald H. Campbell, Jill S. Baron
Would ecological landscape restoration make the Bandelier Wilderness more or less of a wilderness? Would ecological landscape restoration make the Bandelier Wilderness more or less of a wilderness?
The purpose of this paper is to foster discussion on the basic issue of whether it is appropriate or not to intervene in designated wilderness areas that have been “trammeled by man” and, as a result, no longer retain their “primeval character and influence.” We explore this wilderness management dilemma (whether we can or should actively manage wilderness conditions to restore and...
Authors
C.A. Sydoriak, Craig D. Allen, Brian F. Jacobs
The disparity between extreme rainfall events and rare floods - with emphasis on the semi-arid American West The disparity between extreme rainfall events and rare floods - with emphasis on the semi-arid American West
Research beginning 40 years ago suggested that semi-arid lands of the USA have higher unit discharges for a given recurrence interval than occur in other areas. Convincing documentation and arguments for this suspicion, however, were not presented. Thus, records of measured rainfall intensities for specified durations and recurrence intervals, and theoretical depths of probable maximum
Authors
W. R. Osterkamp, Jonathan M. Friedman
Correlates to colonizations of new patches by translocated populations of bighorn sheep Correlates to colonizations of new patches by translocated populations of bighorn sheep
By 1950, bighorn sheep were extirpated from large areas of their range. Most extant populations of bighorn sheep (Ovis canadensis) in the Intermountain West consist of
Authors
F. J. Singer, M.E. Moses, S. Bellew, W. Sloan
Investigation of nitrogen transformations in a southern California constructed wastewater treatment wetland Investigation of nitrogen transformations in a southern California constructed wastewater treatment wetland
A 9.9-ha combined habitat and wastewater treatment demonstration wetland was constructed and planted in the summer of 1994, at Eastern Municipal Water District’s (EMWD) Hemet/San Jacinto Regional Water Reclamation Facility (RWRF) in southern California. From January 1996 through September 1997, the marsh–pond–marsh wetland system was operated to polish an average of 3785 m3 d−1 (1×106...
Authors
J.J. Sartoris, J.S. Thullen, L. B. Barber, D.E. Salas
Elk, beaver, and the persistence of willows in national parks: Response to Keigley (1999) Elk, beaver, and the persistence of willows in national parks: Response to Keigley (1999)
No abstract available.
Authors
F. J. Singer, L. C. Zeigenfuss, R.G. Cates, D.T. Barnett
Distribution, movements, and habitat use of razorback sucker (Xyrauchen texanus) in a lower Colorado River Reservoir, Arizona-Nevada Distribution, movements, and habitat use of razorback sucker (Xyrauchen texanus) in a lower Colorado River Reservoir, Arizona-Nevada
Distribution, movements, and habitat use of 10 wild adult razorback suckers (Xyrauchen texanus) were examined in Lake Mohave, Arizona-Nevada, from November 1994 through July 1997. Movement rates (0.00-17.35 km d⁻¹) and ranges (x̄ = 39 km) were similar to those for riverine populations. All study fish returned to spawning sites used in previous years, but they also visited other spawning...
Authors
G.A. Mueller, P.C. Marsh, G. Knowles, T. Wolters
Paradise confounded: the status of Alaska's instream flow program. Review of "Annual Summary of Instream Flow Reservations and Protection in Alaska" by Christopher E. Estes Paradise confounded: the status of Alaska's instream flow program. Review of "Annual Summary of Instream Flow Reservations and Protection in Alaska" by Christopher E. Estes
No abstract available.
Authors
Nina Burkardt