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State-and-transition models are increasingly being used to guide rangeland management. These models provide a relatively simple, management-oriented way to classify land condition (state) and to describe the factors that might cause a shift to another state (a transition). There are many formulations of state-and-transition models in the literature. The version we endorse does not adhere to any particular generalities about ecosystem dynamics, but it includes consideration of several kinds of dynamics and management response to them. In contrast to previous uses of state-and-transition models, we propose that models can, at present, be most effectively used to specify and qualitatively compare the relative benefits...
Recently,the United States Bureau of Reclamation agreed to increase springreleases from Upper Colorado River Basin reservoirs to create amore natural flow regime in the lower Gunnison River andUpper Colorado River. Fishery managers have expressed concern that newoperations could change reservoir conditions and jeopardize popular and economicallyimportant reservoir sport fisheries. This study attempts to predict howone aspect of reservoir conditions, thermal structure, might respond tonew dam operations at Blue Mesa Reservoir aimed at addressingdownstream ecological concerns. A one-dimensional thermal model (CE-THERM) is appliedto simulating thermal effects of ?traditional? and proposed ?new? damoperation scenarios....