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The Cost of Restoration as a Way of Defining Resilience: a Viability Approach Applied to a Model of Lake Eutrophication Ecology and Society
Martin, Sophie; Cemagref; sophie.martin@cemagref.fr.
Multiple stable states or alternative equilibria in ecological systems have been recognized since the 1960s in the ecological literature. Very often, the shift between alternative states occurs suddenly and the resource flows from these systems are modified. Resilience is the capacity of a system to undergo disturbance and maintain its functions and controls. It has multiple levels of meaning, from the metaphorical to the specific. However, most studies that explore resilience-related ideas have used resilience as a metaphor or theoretical construct. In a few cases, it has been defined operationally in the context of a model of a particular system. In this paper, resilience is defined consistently with the theoretical uses of the term, in the context of...
Tipo: Peer-Reviewed Reports Palavras-chave: Dynamic systems; Ecosystem models; Eutrophication; Lake ecosystem; Resilience; Time of crisis.
Ano: 2004
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Ecosystem Modeling for Evaluation of Adaptive Management Policies in the Grand Canyon Ecology and Society
Walters, Carl J; University of British Columbia; c.walters@fisheries.ubc.ca; Korman, Josh; Ecometric Research Inc.; jkorman@ecometric.com; Stevens, Lawrence E; Stevens Ecological Consulting; farvana@aol.com; Gold, Barry; The David and Lucile Packard Foundation; bgold@packard.org.
An Adaptive Environmental Assessment and Management workshop process was used to assist Grand Canyon scientists and managers in developing conceptual and simulation models for the Colorado ecosystem affected by Glen Canyon Dam. This model examines ecosystem variables and processes at multiple scales in space and time, ranging from feet and hours for benthic algal response to diurnal flow changes, to reaches and decades for sediment storage and dynamics of long-lived native fish species. Its aim is to help screen policy options ranging from changes in hourly variation in flow allowed from Glen Canyon Dam, to major structural changes for restoration of more natural temperature regimes. It appears that we can make fairly accurate predictions about some...
Tipo: Peer-Reviewed Reports Palavras-chave: Adaptive management; Aquatic primary productivity; Colorado River; Dam; Ecosystem models; Grand Canyon; Habitat restoration; Hydrology; Insect productivity; Native fishes; Riparian ecosystems; Sediment budget.
Ano: 2000
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