joan hagar - birds and mammals and herps
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Joan Hagar - Birds and Mammals and HerpsTRANSCRIPT
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Effects of Forest Management on Wildlife Use of Early Seral
Habitats
Joan HagarUSGS-FRESC
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Early Seral = Seedling Conifers?
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Following Natural Disturbance ... • Structure
– Legacy trees and snags
– Open (low tree density)
– Large wood• Composition
– Herbs and Grasses – Shrubs– Hardwoods
Bob Altman
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Residual trees and
snags
Matt Lee
D. Vesely
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Bob Altman
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D. Vesely
Early Seral Habitat for Reptiles
•Basking•Prey
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Dead Wood as Refugia
D. Vesely
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Food Resources
• Foliage• Nectar• Fruits• Seeds
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Matt Lee
Matt Lee
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Arthropods
• Insect diversity correlated with plant diversity
• Deciduous species support more insects
• Influence of deciduous litter on soil food webs?
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Peter LaTourrette
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Matt Lee
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Consequences of reduced temporal span of early seral
habitats• Limit on shrub size
and age
• Shortens duration of shrubby habitat
• Reduced persistence of shrubs into mid-aged forests
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Effects of Conifer-centric Forest Management on Early Seral
Habitat• Fewer residual structures
• Altered vegetation composition– Alters patterns of food
abundance
– Reduces diversity of food resources
– Alters food webs
• Reduced temporal span
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1968 1972 1976 1980 1984 1988 1992 1996 2000 2004
30 Year Trend for Swainson’s Thrush from Tillamook S.F. BBS Route
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Vertical Diversity?