Treesearch

Selected physical, chemical and bacteriological qualities of stream water entering and leaving a campground were examined during the summer of 1978 to investigate the influence of recreational use. Water samples were collected and analyzed at approximately biweekly intervals, and also three times daily before and after the Memorial Day, Fourth of July, and Labor Day weekends. Chemical and physical quality remained unchanged and densities of indicator bacteria in surface water were not significantly increased by recreational use of a campground equipped with modern sanitation facilities.

Lists alphabetically, by author, publications of the Rocky Mountain Forest and Range Experiment Station for 1980 through 1989, including both subject matter and author Indexes. This publication continues the information shown in USDA Forest Service General Technical Report RM-6, “Publications of the Rocky Mountain Forest and Range Experiment Station, 1953-1973,” compiled by Mona F. Nickerson and Glen E. Brink, published in 1974; and “Publications of the Rocky Mountain Forest and Range Experiment Station, 1974-1979,” compiled by Sharon M. Litten, and published in 1980 (which included all...

Relationships between height of big sagebrush and crown area, fuel loading, bulk density, size distribution of foliage and stemwood, and fraction dead stemwood are presented. Based upon these relationships, modeled rate-of-fire spread and fireline intensity are shown for sagebrush ranging in height from 20 to 120 em and in coverage from 10 to 40 percent. Verification of predicted fire behavior and applications are discussed.

Subalpine lakeshore campsites were studied in the Eagle Cap Wilderness, Oreg. Light-use campsites had experienced almost as much alteration as moderate- and heavy-use sites. Sites set back from lakeshores had changed as much as lakeshore sites. Selected indicators of ecological change were evaluated. Implications of this research to management of wilderness campsites are discussed.

Nest holes drilled by woodpeckers (Picidae) are frequently used by secondary cavity-nesting species, but interspecific use of open and domed nests is less well known. Nests constructed by many southwestern desert birds last longer than one year (pers. obs.) and are consequently reused by the same pair (e.g., Abert's Towhees [Pipilo aberti], pers. obs.) or by other birds as suitable nests. I observed several instances of interspecific nest use in honey mesquite (Prosopis glandulosa) habitat of the lower Colorado River valley, on the Colorado River Indian Reservation about 10 km north of...

A recent "Opinion" in the Wildlife Society Bulletin (Bart and Anderson 1981) made a case against publishing symposia proceedings because (1) papers of non-refereed symposia often lack credibility and, therefore, harm both the authors and the profession, (2) proceedings are not readily retrievable, and (3) some symposium reports are not appropriate for publication. Although some proceedings may be disorganized and include poorly written papers, Bart and Anderson's generalization unnecessarily downgrades what can be an excellent tool for technology transfer. In this rebuttal opinion we give...

Although the "dwarf" race of the Brown-headed Cowbird (Molothrus ater obscurus) is sympatric with the Crissal Thrasher (Toxostoma dorsale) in the lower Colorado River valley, I observed no parasitism in 15 thrasher nests. To determine whether or not the absence of cowbird eggs was caused by egg rejection, I experimentally parasitized nine thrasher nests. Cowbird eggs were ejected by thrashers at all experimental nests. To test the prediction that ejection or absence of cowbird eggs reduces nesting mortality, I compared thrasher nesting success to that of a sympatric accepter, the Abert's...

This paper is a distillation of some of the most important information resulting from a half-century of research on sagebrush-grass rangelands. It has been prepared as a reference for managers and users of rangelands and as a help for planning and decisionmaking.

A calibration model for screen-caged Peltier thermocouple psychrometers was developed that applies to a water potential range of 0 to-80 bars, over a temperature range of 0° to 40° C, and for cooling times of 15 to 60 seconds. In addition, the model corrects for the effects of temperature gradients over zero-offsets from -60 to + 60 microvolts. Complete details of model development are discussed, together with the theory of thermocouple psychrometers, and techniques of calibration and cleaning. Also, information for computer programing and tabular summaries of model characteristics are...

Documentation is given for using a simulation model combining the Stand Prognosis Model and the Douglas-fir Tussock Moth Outbreak Model. Four major areas are addressed: (1) an overview and discussion of the combined model; (2) description of input options; (3) discussion of model output, and (4) numerous examples illustrating model behavior and sensitivity.