habitat use and ecology of the northern flying squirrel todd m. wilson usfs, pnw research station
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Habitat Use and Ecology of theHabitat Use and Ecology of theNorthern Flying SquirrelNorthern Flying Squirrel
Todd M. WilsonTodd M. Wilson
USFS, PNW Research StationUSFS, PNW Research Station
Pacific Northwest
Simplified to ComplexSimplified to Complex
13 ha Stand (32 acres)
Variable-density Thinning
Legacy ForestLegacy Forest
Open-Cut
Light ThinControl
Pre-treatment
Timber ForestTimber Forest
Open-Cut
Light ThinControl
Pre-treatment
Thinning
AssociationsAssociations
Understory cover
Patch-level changesin vegetation
Large snags
Large treesEricaceous
shrubs
High canopy cover
Nearness to conifers
Nearness to water
Abundant coarse woody debrisLarge coarse
woody debris
Increased litter depthAvailability of fungi Stand Age
Hypothesized Limiting Hypothesized Limiting FactorsFactors
FoodFood DensDens PredationPredation CompetitionCompetition
Forest Structuring Forest Structuring ProcessesProcessesCrown-class Differentiation Understory Development
Canopy Stratification Decadence
Classifying Stands as Classifying Stands as High or Low AbundancesHigh or Low Abundances
10-m Intercept
Variance inLive Tree d.b.h
CanopyGaps
Olympic Peninsula
(smallest white patches ca. 10m x 10m gaps)
Vertical LayersVertical Layers
5
1015
2025
Structure-Predation Structure-Predation HypothesisHypothesis
Fore
st
Str
uctu
reF
ore
st
Str
uctu
re
Detection RiskDetection Risk((Visual/Aural/ScentVisual/Aural/Scent))
OR
High
Low
OR
Attack RiskAttack Risk
Safe
Unsafe
Very Unsafe
Mixed
Squirrel Space UseSquirrel Space Use
Den
Where do we find lots of Where do we find lots of flying squirrels?flying squirrels?
Where do we find few (if Where do we find few (if any) squirrels?any) squirrels?
What about big trees, What about big trees, snags and CWD?snags and CWD?
Stay tuned for Stay tuned for
Part IIPart II