Treesearch

This manuscript provides information needed for the user to access current information about forest growth and yield simulators. Ultimately, the best source of information for any simulator is the user’s guide and the sage advice of those who built the simulator. In some instances, these people are easy to find and are willing to provide all the support for the program. Other simulators have, unfortunately, been abandoned due to retirements and other career moves of researchers. Users should take advantage of the opportunity to make direct contact with developers whenever possible. Much...

These comments are arranged to follow the pattern used by Reid (1998a) to allow convenient comparison with the original comments concerning the draft plan. Because of the dominating role played by alterations to sediment, woody debris and water regimes in the generation of cumulative watershed impacts, these components are discussed first. New information concerning the role of each is first described, if available, and the adequacy of provisions of the plan is then evaluated

Summary - Appropriate temporal and spatial scales vary between rehabilitation objectives. A scale appropriate within a physical or biological context might not be appropriate within a political or social context. For example, corporations and stockholders consider quarterly profits and losses to be an important measure of corporate health. Politicians often focus on election cycles as their measure of a program's success. Those who ignore the quarterly balance sheet or the next election may find themselves out of a job. Company- and government-sponsored rehabilitation programs, therefore,...

Abstract - To improve understanding of the significance of large woody debris to stream fishes, we examined the influence of woody debris on fall and winter movement by adult coastal cutthroat trout (Oncorhynchus clarki) using radiotelemetry. Fish captured in stream pools containing large woody debris moved less than fish captured in pools lacking large woody debris or other cover. Fish from pools lacking cover commonly moved to habitats with large boulders or brush, particularly during the day. Movements by fish over 1-day periods were strongly influenced by large woody debris or other...

Abstract - Spatially explicit individual-based models (IBMs) use movement rules to determine when an animal departs its current location and to determine its movement destination; these rules are therefore critical to accurate simulations. Movement rules typically define some measure of how an individual's expected fitness varies among locations, under the assumption that animals make movement decisions at least in part to increase their fitness. Recent research shows that many fish move quickly in response to changes in physical and biological conditions, so movement rules should allow...

Abstract - Recent thinking in natural resource management has led federal land management agencies such as the U.S. Department of Agriculture's Forest Service (Forest Service) to adopt ecosystem management as its official land management policy. A pivotal aspect of ecosystem management is interdisciplinary analysis of complex land management problems. Interdisciplinary watershed analysis attempts to engage in this approach and is intended to synthesize biological, physical, and socio-economic data in 20- to 200-square-mile watersheds in the Pacific Northwest. Watershed analysis is carried...