Flying Squirrel Response to Thinning in the Oregon Cascades Tom Manning 1, Joan Hagar 2, Brenda...
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Transcript of Flying Squirrel Response to Thinning in the Oregon Cascades Tom Manning 1, Joan Hagar 2, Brenda...
![Page 1: Flying Squirrel Response to Thinning in the Oregon Cascades Tom Manning 1, Joan Hagar 2, Brenda McComb 1 1 OSU - Forest Ecosystems and Society 2 USGS –](https://reader036.fdocuments.in/reader036/viewer/2022062619/55151bf5550346a80c8b6056/html5/thumbnails/1.jpg)
Flying Squirrel Response to Thinning in the Oregon
Cascades
Tom Manning1, Joan Hagar2, Brenda McComb1
1 OSU - Forest Ecosystems and Society2 USGS – Forest & Rangeland Ecosystem Science Center
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Thinning: A Tool for Restoring Diversity•Short term:
– Increase structural diversity
•Long term:– Accelerate
development of late-seral habitat
– Maintain structural diversity
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???
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The Young Stand Thinning & Diversity Study
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Questions of Interest
• How can thinning be adapted to meet diversity goals?
• What is the effect of different patterns and intensities of thinning on responses of management concern?
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Long-Term Questions
•Will response direction change over time?
• How soon will thinned stands support old forest wildlife species?
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YSTDS: Replicated Study With Controls
• 4 replicates of each treatment
• Data collected before and after harvest
• Controls track baseline changes in bird density
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Previous Thinning Studies
Decreases• Mt. Lassen, CA• Ft. Lewis, WA• Blue Mtns, OR• Algonquin Park,
ONT• Teakettle, CA
No Effect• Central BC• Coastal BC• Tillamook, OR
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The Young Stand Thinning & Diversity Study
![Page 11: Flying Squirrel Response to Thinning in the Oregon Cascades Tom Manning 1, Joan Hagar 2, Brenda McComb 1 1 OSU - Forest Ecosystems and Society 2 USGS –](https://reader036.fdocuments.in/reader036/viewer/2022062619/55151bf5550346a80c8b6056/html5/thumbnails/11.jpg)
The Young Stand Thinning & Diversity Study
![Page 12: Flying Squirrel Response to Thinning in the Oregon Cascades Tom Manning 1, Joan Hagar 2, Brenda McComb 1 1 OSU - Forest Ecosystems and Society 2 USGS –](https://reader036.fdocuments.in/reader036/viewer/2022062619/55151bf5550346a80c8b6056/html5/thumbnails/12.jpg)
2007-2008 Sampling
(~ 12 yrs post-thin)
• Early rainy season (Sept-Nov)
• Sherman traps: 50 per stand
• Tomahawk traps: 50 per stand
• 50% of Tomahawks on trees, 1.5 m high
• Mark-Recapture, 4-night session
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RESULTS
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Flying Squirrel Densities with 95% CI's
2007
AA
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Comparison of Squirrel Density to other Studies
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Habitat Associations
+ Snag Density
-Low Shrub Cover
(+ Basal Area)
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SNAGS
• Flying squirrel density positively associated with snag density
• Snags rare in thinned stands
• Thinning causes decrease in density-dependent mortality
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Importance of Overstory Characteristics
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Summary• Lower densities in
thinned young stands• Negative impact lasts
at least 12 years• Impact proportional
to thinning intensity
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• Do differences in density reflect habitat quality?
• Do fliers have lower fitness in thinned stands?ReproductionSurvival
• How long will it take for flier densities to recover?
• Landscape-level question: Configuration or Composition?
Yet to Learn…
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Management Implications
• If goal is to maintain flying squirrel habitat, thinning may be incompatible in short- term
• Long term…?
• There are always Winners and Losers
© L
arr
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er
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Decreasers:Trowbridge’s ShrewPacific ShrewRed-backed VoleFlying Squirrel
Increasers:ChipmunkDeer MouseCreeping Vole
Red-backed vole
0
10
20
30
Control Light Heavy Gaps
Deer mouse
0
40
80
120
Control Light Heavy Gaps
YSTDS: Small Mammal Responses
12 Years After Thinning
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YSTDS: Response of Song Birds to Thinning
• Increases in species associated with open canopy conditions
• Decreases in species associated with dense, closed conifer canopy
• Overall increase in species richness
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Conclusions• Thinning is a valuable tool
for enhancing diversity in managed forests
• Important to consider landscape context to manage conflict between short- and long-term habitat requirements
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© L
arr
y M
ast
er