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

slide2
Ecosystem Introduction
    • Function
    • Disturbance
  • Quantitative Analysis & Results
  • Implications
    • Ecosystem
    • Management
slide3

Black Bear Harvesting Cones

Photo: Ryan Sims

Seed Dispersal Vector

Clark’s Nutcracker

Photo: A. Wilson

slide4

Ecological Background

Whitebark Distribution

Greater Yellowstone Ecosystem – Northwest Wyoming

ecological background
EcologicalBackground

Mountain Pine Beetle

Native insect

Photo from Allen Carroll

ecological background1
Ecological Background

Blister Rust

Exotic Pathogen

Photo Susan Hagle, USFS

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Which tree & stand characteristics determine beetle selection and

the resulting mosaic of mortality?

project objectives
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
study sites
Study Sites

Sylvan Pass

Breccia

Teewinot

Mt. Leidy

three stand types
Three Stand Types

Whitebark & Non-Beetle Host

Whitebark & Alternate Beetle Host

Pure Whitebark

data collection
Data Collection
  • Within A Stand (2-3 ha)
    • 24 plots systematically distributed
    • Variable radius
    • Tree = replicate
step 2 selection ratio
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
slide15

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

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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
conclusions
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
implications
Implications
  • “Barometer of change”
  • Spatial & temporal prioritization of restoration sites
  • Alteration of genetic structure of remaining seed source
  • Redirection of succession
acknowledgements
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: [email protected]

Michael Straw

UWYO

Ryan Sims

CSU

Bridger-Teton NF

My Mom, Alida

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