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 –

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Presentation transcript:

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 – Forest & Rangeland Ecosystem Science Center

Thinning: A Tool for Restoring Diversity Short term: –Increase structural diversity Long term: –Accelerate development of late-seral habitat –Maintain structural diversity

???

The Young Stand Thinning & Diversity Study

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?

Long-Term Questions Will response direction change over time? How soon will thinned stands support old forest wildlife species?

YSTDS: Replicated Study With Controls 4 replicates of each treatment Data collected before and after harvest Controls track baseline changes in bird density

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

The Young Stand Thinning & Diversity Study

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

RESULTS

Flying Squirrel Densities with 95% CI's 2007 A A

Comparison of Squirrel Density to other Studies

Habitat Associations + Snag Density -Low Shrub Cover (+ Basal Area)

SNAGS Flying squirrel density positively associated with snag density Snags rare in thinned stands Thinning causes decrease in density- dependent mortality

Importance of Overstory Characteristics

Summary Lower densities in thinned young stands Negative impact lasts at least 12 years Impact proportional to thinning intensity

Do differences in density reflect habitat quality? Do fliers have lower fitness in thinned stands? Reproduction Survival How long will it take for flier densities to recover? Landscape-level question: Configuration or Composition? Yet to Learn…

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 © Larry Master

Decreasers: Trowbridges Shrew Pacific Shrew Red-backed Vole Flying Squirrel Increasers: Chipmunk Deer Mouse Creeping Vole YSTDS: Small Mammal Responses 12 Years After Thinning

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

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

© Larry Master