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Predictive Modeling of Northern Spotted Owl Home Ranges

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Predictive Modeling of Northern Spotted Owl Home Ranges

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    1. Predictive Modeling of Northern Spotted Owl Home Ranges

    2. Presentation Overview Northern Spotted Owl (NSO) Models Study Area Data Methods and Analysis Research Relevance Potential Challenges

    3. Northern Spotted Owl Listed as Threatened in 1990 Habitat Surveys Conservation

    4. Current Method to Assess Effects of Human Activities to NSO NSO territories are centered on an ‘activity center’ 0.5-mile core area 1.3-mile radius home range Radio telemetry studies

    5. Research Question: Is there a way to describe home ranges for Northern Spotted Owls that does not use circles?

    6. Project Objectives Refine the current circle-based analysis method Telemetry data Abiotic attributes:

    7. Models

    8. Study Areas

    9. Topography and Telemetry Points: Hilt and Goosenest Study Areas

    10. Data Vector Data Telemetry points Activity center points Streams Vegetation/Habitat Raster Data 10-meter Digital Elevation Models (DEMs)

    11. Data Pre-processing

    12. Maxent Modeling: Abiotic-only Input occurrence data Telemetry points Input abiotic variables Aspect Curvature Distance to stream Elevation Slope percent Slope position Solar radiation

    13. Maxent Modeling: Habitat-only Input occurrence data Telemetry points Input habitat variables Habitat

    14. Maxent Modeling: Abiotic + Habitat Input occurrence data Telemetry points Input abiotic variables Aspect Curvature Distance to stream Elevation Slope percent Slope position Solar radiation Input habitat variables Habitat

    15. Maxent Model Outputs

    16. HexSim Model Input data Nest points HexMap of spatial data from Maxent

    17. HexSim Model: Range Parameters Maximum search radius Maximum area searched

    18. HexSim Model: Search Parameters Uniform

    19. HexSim Model Outputs Maps Spatial data Simulation data

    20. Analysis Evaluate Maxent probability distributions Testing with reserved telemetry data Compare HexSim home ranges to circles Assess research question

    21. Research Relevance Refine current circle-based analysis method Likelihood of use Extent of use Degree of effects Repeatable methods Future applications Landscape level assessments of potential for NSO occupancy Habitat restoration activities Prescribed fire and fuels management

    22. Potential Challenges Maxent and HexSim models Permission for some data can be revoked Too much data Addition of abiotic variables Abiotic variables may not be important to NSO Time!!

    23. Acknowledgements Brian Woodbridge, U.S. Fish and Wildlife Service Jeff Dunk, Humboldt State University Nathan Schumaker, U.S. Environmental Protection Agency Dave LaPlante, Natural Resource Geospatial National Council for Air and Stream Improvement Fruit Growers Supply Company Timber Products Company Klamath National Forest

    24. Questions?

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