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Habitat Use and Ecology of the Northern Flying Squirrel Todd M. Wilson USFS, PNW Research Station.

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Presentation on theme: "Habitat Use and Ecology of the Northern Flying Squirrel Todd M. Wilson USFS, PNW Research Station."— Presentation transcript:

1 Habitat Use and Ecology of the Northern Flying Squirrel Todd M. Wilson USFS, PNW Research Station

2 Pacific Northwest

3 Simplified to Complex

4 13 ha Stand (32 acres)

5 Variable-density Thinning

6 Legacy Forest Open-Cut Light Thin Control Pre-treatment

7 Timber Forest Open-Cut Light Thin Control Pre-treatment

8 Thinning

9 Associations Understory cover Patch-level changes in vegetation Large snags Large trees Ericaceous shrubs High canopy cover Nearness to conifers Nearness to water Abundant coarse woody debris Large coarse woody debris Increased litter depth Availability of fungi Stand Age

10 Hypothesized Limiting Factors Food Food Dens Dens Predation Predation Competition Competition

11 Forest Structuring Processes Crown-class Differentiation Understory Development Canopy Stratification Decadence

12 Classifying Stands as High or Low Abundances 10-m Intercept Variance in Live Tree d.b.h Canopy Gaps

13 Olympic Peninsula (smallest white patches ca. 10m x 10m gaps)

14 Vertical Layers

15 Structure-Predation Hypothesis Forest Structure

16 Detection Risk ( Visual/Aural/Scent ) OR High Low OR

17 Attack Risk Safe Unsafe Very Unsafe Mixed

18 Squirrel Space Use Den

19 Where do we find lots of flying squirrels?

20 Where do we find few (if any) squirrels?

21 What about big trees, snags and CWD?

22 Stay tuned for Part II


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