Aquatic Invasive Species
Aquatic Invasive Species (AIS) are non-native organisms that threaten the abundance and diversity of native organisms in Lake Tahoe. The presence of these species continues to threaten native species in the lake and the presence of aquatic weeds increases nutrients in the system which may impact nearshore clarity. Non-native species have been both intentionally and unintentionally introduced to Lake Tahoe over the last 150 years. Habitat modification such as channelization and modification of the Upper Truckee Marsh for development of the Tahoe Keys also created micro-environments within the lake that may be more suitable for colonization by AIS. Climate change also threatens to alter the lake’s physical environment, with the potential for making further AIS establishment more likely. Various regional programs are aimed at AIS prevention, monitoring and rapid response, and control.
Indicators
| THRESHOLD CATEGORY REPORTING CATEGORY INDICATOR |
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| THRESHOLD CATEGORY REPORTING CATEGORY INDICATOR |
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The threshold evaluation assigns a status to an indicator relative to the adopted standard. As shown on the icon legend below, the background color of the reporting icon communicates the indicator “status” or estimate of current condition. For numerical standards, the status of an indicator is classified into “better” or “worse” categories based on the percent divergence of the current indicator value from the standard or interim target. For most indicators, the current value is taken directly from the value recorded in the most recent year. In some cases, the average value calculated from all data collected during the evaluation period is used. When an average value is used, it is noted and explained on the indicator evaluation page for that specific evaluation year.
Note: Thresholds reported as "Implemented" refer to thresholds that were adopted as policy guidance in the development of the Regional Plan. In these cases, the subject policies, ordinances, or environmental protections have been incorporated into the TRPA Regional Plan and TRPA Code of Ordinances.