Identification_Information: Citation: Citation_Information: Originator: Knick, S. T. Publication_Date: 20040604 Title: State and Transition Conceptual Model For a Typical Shrub-Steppe Ecological System Other_Citation_Details: The figure containing information pertaining to a state and transition plant dynamics model for shrub-steppe systems can be found in Fig. 7.33, Chapter 7, p. 7-102, in Connelly, J. W., S. T. Knick, M. A. Schroeder, and S. J. Stiver. 2004. Conservation assessment of Greater Sage-grouse and sagebrush habitats. Western Association of Fish and Wildlife Agencies. Unpublished Report. Cheyenne, Wyoming. See the following citation for further details: Bestelmeyer, B.T., Brown, J.R., Havstad, K.M., Alexander, R., Chavex, G., & Herrick, J.E. (2003). Development and use of state-and-transition models for rangelands. Journal of Range Management, 56, 114-126. Laycock, W.A. (1991). Stable states and thresholds of range condition on North American rangelands: A viewpoint. Journal of Range Management, 44, 427-433. Westoby, M., Walker, B., & Noy-Meir, I. (1989). Opportunistic management of rangelands not at equilibrium. Journal of Range Management, 42, 266-274. Online_Linkage: http:\\sagemap.wr.usgs.gov Description: Abstract: Figure 7.33 represents a conceptual diagram of a state and transition model for plant dynamics in a typical shrub-steppe ecosystem. The model recognizes the non- (or multi-) equilibrium nature of rangelands, where certain combinations of triggers can lead to multiple trajectories of vegetation change. The encroachment of pinyon-juniper or invasion of exotic annual grasses into previously sagebrush dominated or sagebrush-steppe systems will affect the natural ecological processes (i.e. nutrient cycling, erosion potential, fire return interval) and susceptibility to future disturbances. In areas where the degradation of habitat quality has not been too severe and the community has remained within the upper state, passive restoration may be used to achieve the desired vegetation changes. Depending on the disturbance history, including the combination, timing, duration, and intensity of events, more aggressive efforts to restore and rehabilitate a particular site may be required. Purpose: This figure represents a conceptual diagram of the vegetation dynamics that can take place within a sagebrush-steppe ecosystem as a result of the combination of different disturbance effects and land management practices. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20040604 Currentness_Reference: Publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -123.732881 East_Bounding_Coordinate: -102.269813 North_Bounding_Coordinate: 49.999432 South_Bounding_Coordinate: 35.723732 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: sagebrush-steppe Theme_Keyword: vegetation dynamics Theme_Keyword: State and Transition Model Theme_Keyword: habitat quality Theme_Keyword: restoration Theme_Keyword: rehabilitation Theme_Keyword: thresholds Theme_Keyword: ecological pathways Place: Place_Keyword_Thesaurus: None Place_Keyword: Washington Place_Keyword: Oregon Place_Keyword: California Place_Keyword: Idaho Place_Keyword: Nevada Place_Keyword: Utah Place_Keyword: Montana Place_Keyword: Wyoming Place_Keyword: Colorado Place_Keyword: North Dakota Place_Keyword: South Dakota Place_Keyword: Arizona Place_Keyword: New Mexico Place_Keyword: Alberta Place_Keyword: Saskatchewan Place_Keyword: North America Place_Keyword: United States Access_Constraints: None Use_Constraints: None, but the user assumes all responsibility for appropriate use of the data. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Snake River Field Station Contact_Position: Geographer Contact_Address: Address_Type: mailing and physical address Address: 970 Lusk St. City: Boise State_or_Province: ID Postal_Code: 83706 Country: USA Contact_Voice_Telephone: 208-426-5204 Contact_Facsimile_Telephone: 208-426-5210 Contact_Electronic_Mail_Address: tzarriel@usgs.gov Distribution_Liability: We make every effort to provide and maintain accurate, complete, usable, and timely information on our web sites. However, some USGS data and information accessed through these pages may, of necessity, be preliminary in nature and presented prior to final review and approval by the Director of the USGS. These data and information are provided with the understanding that they are not guaranteed to be correct or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Metadata_Reference_Information: Metadata_Date: 2004101804 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Lisa Langs Contact_Organization: RS/GIS Laboratory - Utah State University Contact_Position: GIS Analyst Contact_Address: Address_Type: mailing address Address: 5275 Old Main Hill City: Logan State_or_Province: UT Postal_Code: 84322 Country: USA Contact_Voice_Telephone: (435) 797-4374 Contact_Electronic_Mail_Address: lisa.langs@usu.edu Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998