Ecological Thresholds as a Basis for Defining Management Triggers for National Park Service Vital Signs?Case Studies for Dryland Ecosystems

Threshold concepts are used in research and management of ecological systems to describe and interpret abrupt and persistent reorganization of ecosystem properties (Walker and Meyers, 2004; Groffman and others, 2006). Abrupt change, referred to as a threshold crossing, and the progression of reorganization can be triggered by one or more interactive disturbances such as land-use activities and climatic events (Paine and others, 1998). Threshold crossings occur when feedback mechanisms that typically absorb forces of change are replaced with those that promote development of alternative equilibria or states (Suding and others, 2004; Walker and Meyers, 2004; Briske and others, 2008). The alternative states that emerge from a threshold crossing vary and often exhibit reduced ecological integrity and value in terms of management goals relative to the original or reference system. Alternative stable states with some limited residual properties of the original system may develop along the progression after a crossing; an eventual outcome may be the complete loss of pre-threshold properties of the original ecosystem.

Author: U. S. Department of the Interior

Publisher: Createspace Independent Publishing Platform

Publication Date: Mar 30, 2014

Number of Pages: 102 pages

Binding: Paperback or Softback

ISBN-10: 1496183568

ISBN-13: 9781496183569