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Ecosystem Introduction Function Disturbance Quantitative Analysis & Results Implications Ecosystem Management

Reciprocal Disturbance Interactions in Pinus albicaulis Ecosystems Nancy Bockino – M.S. Candidate Daniel Tinker – Advisor University of Wyoming Department of Botany. Ecosystem Introduction Function Disturbance Quantitative Analysis & Results Implications Ecosystem Management.

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Ecosystem Introduction Function Disturbance Quantitative Analysis & Results Implications Ecosystem Management

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  1. Reciprocal Disturbance Interactionsin Pinus albicaulis Ecosystems Nancy Bockino – M.S. CandidateDaniel Tinker – AdvisorUniversity of Wyoming Department of Botany

  2. Ecosystem Introduction • Function • Disturbance • Quantitative Analysis & Results • Implications • Ecosystem • Management

  3. Black Bear Harvesting Cones Photo: Ryan Sims Seed Dispersal Vector Clark’s Nutcracker Photo: A. Wilson

  4. Ecological Background Whitebark Distribution Greater Yellowstone Ecosystem – Northwest Wyoming

  5. EcologicalBackground Mountain Pine Beetle Native insect Photo from Allen Carroll

  6. Ecological Background Blister Rust Exotic Pathogen Photo Susan Hagle, USFS

  7. Which tree & stand characteristics determine beetle selection and the resulting mosaic of mortality?

  8. Project Objectives Quantify • Whitebark characteristics related to beetle selection • Beetle host-selection patterns • Relationship between blister rust & beetle selection Provide 1. Summary of whitebark condition in the GYE • Predictions of beetle selection • Ecosystem familiarity to aid restoration strategies

  9. Study Sites Sylvan Pass Breccia Teewinot Mt. Leidy

  10. Three Stand Types Whitebark & Non-Beetle Host Whitebark & Alternate Beetle Host Pure Whitebark

  11. Data Collection • Within A Stand (2-3 ha) • 24 plots systematically distributed • Variable radius • Tree = replicate

  12. Whitebark Status in theGreater Yellowstone Ecosystem

  13. Step 1: Chi-Square

  14. Step 2: Selection Ratio (# preferred host attacked÷ total attacked) (# preferred host available ÷ total available) = • Accounts for: • 1. stand density • 2. species composition • 3. sequence of attack • Selection Ratio 1.0 = No Preference • Host characteristics • blister rust severity • tree species

  15. Sylvan Pass Selection Ratio 1.0 = No Preference Step 2: Selection Ratio *α = 0.05 Teewinot Breccia Mt. Leidy Beetles prefer: 1. whitebark over lodgepole 2. whitebark with heavy blister rust

  16. Step 2: Selection Ratio 1.0

  17. Step 3: Multiple Logistic Regression Response Variable • Binary – Selected OR Not Selected Predictor Variables • Stand type (pure vs. non-host mix) • Blister rust severity (light vs. heavy) • Tree diameter

  18. Step 3: Multiple Logistic Regression

  19. Conclusions • Beetles select whitebark over lodgepole • Blister rust influences selection probability Positive relationship between heavy rust & beetle selection. • Interactions Between • Blister Rust & Beetle Selection • Enhance Disturbance Severity

  20. Implications • “Barometer of change” • Spatial & temporal prioritization of restoration sites • Alteration of genetic structure of remaining seed source • Redirection of succession

  21. Acknowledgements Funding sources: Joint Fire Science Program Grant # H1200040001 UWYO – NPS Research Grant Wyoming Native Plant Society Dan Tinker Ken Gerow David Legg Cory Bolen Bill Romme Kelly McCloskey – Grand Teton NP Liz Davey Andy Norman Contact Info: nbockino@uwyo.edu Michael Straw UWYO Ryan Sims CSU Bridger-Teton NF My Mom, Alida

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