What role do ecosystem performance standards play in guiding the basin ecosystem to a desirable future condition?
Pursuant to a bi-state compact, the Tahoe Regional Planning Agency (TRPA) is required to adopt environmental threshold carrying capacities that are necessary to maintain a significant scenic, recreational, educational, scientific, or natural value of the region. The TRPAs Regional Plan must be designed to achieve the thresholds. Nine standards are evaluated every five years by TRPA (the standards are called thresholds in the LTB). In the most recently completed evaluation (1991), only one standard was in compliance. Standards are viewed more as targets to achieve over many years; accordingly, there is an effort not to change the standards, so that a continuous picture of ecosystem performance, and change, can become clear. If a standard is not met over time, the governing institutions can infer that the standards may have been set at unrealistic levels for this ecosystem operating at this juncture in its evolution under this set of human modifications or that restoration and mitigation
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