Osprey Population Sites
This indicator measures the number of active osprey nests in the Tahoe Region. The osprey (Pandion haliaetus) is a conspicuous large raptor that is valued for wildlife viewing. Human disturbance near nesting and foraging areas can impact osprey breeding success. Regional programs that limit forest fire fuel reduction activities around known nests and preserve large snags aim to protect the osprey population. TRPA actively monitors osprey populations across the Tahoe Region with various partners.
Status
Number of active osprey nests recorded in the Tahoe Basin from 1997 through 2019. Threshold standard is four population sites (black line).
Evaluation Map
Appoximate locations of all recorded osprey nests in the Tahoe Basin (2015 through 2019).
2019 Evaluation
- Status
- Considerably Better Than Target
- Trend
- Rapid Improvement
- Confidence
- High
Applicable Standard
W2: Provide a minimum of 4 Osprey population sites.
W9: Provide disturbance zones and influence zones for Osprey.
Key Points
- The osprey population has increased substantially since the early 1980's when only a few nests were active in the Tahoe Basin.
- In the last five years, the number of active nests has varied but remains stable.
- The shoreline from Emerald Bay to DL Bliss State Park and the undeveloped portions of the East Shore are the main reproductive areas for osprey.
- The disturbance zone standard for osprey has been implemented by TRPA and other partner agencies.
- Potential disturbances such as new trails and forest fuels reduction projects are adjusted to protect nesting osprey.
Delivering and Measuring Success
Example EIP Projects
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Emerald Bay SP UC Davis Osprey Spatial Data Analysis
CA State Parks and UC Davis analyzed 30 years of osprey nesting data to look at reproductive success in relation to distance from potential disturbance factors (roads, trails, etc.).
Monitoring Programs