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

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Presentation transcript:

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

Pacific Northwest

Simplified to Complex

13 ha Stand (32 acres)

Variable-density Thinning

Legacy Forest Open-Cut Light Thin Control Pre-treatment

Timber Forest Open-Cut Light Thin Control Pre-treatment

Thinning

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

Hypothesized Limiting Factors Food Food Dens Dens Predation Predation Competition Competition

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

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

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

Vertical Layers

Structure-Predation Hypothesis Forest Structure

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

Attack Risk Safe Unsafe Very Unsafe Mixed

Squirrel Space Use Den

Where do we find lots of flying squirrels?

Where do we find few (if any) squirrels?

What about big trees, snags and CWD?

Stay tuned for Part II