oregon sage-grouse habitat improvement initiative
TRANSCRIPT
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Dawn Davis
ODFW
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Largest North American grouse
Lek mating system Long-lived (up to 5
years) Low productivity Sagebrush obligate Requires vast
expanses of sagebrush
Umbrella species
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Greater
Greater
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Sage-grouse populations are vulnerable to
habitat fragmentation
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Winter
Leks
Nesting & Early Brood-rearing
Late Brood-rearing
Fall
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Habitat Feature Habitat Use Habitat – Wetter
Sites
Habitat – Dryer
Sites
Sagebrush
canopy cover
Nesting Cover 15-25% 15-25%
Sagebrush height Nesting Cover 15-30 inches 12-30 inches
Sagebrush
growth form
Nesting Cover Spreading form,
few if any dead
branches
Spreading form,
few if any dead
branches
Grass & forb
height
Nesting Cover ≥ 7 inches ≥ 7 inches
Grass & forb
canopy cover
Nesting Cover &
Food
≥ 25% ≥ 15%
Forb abundance
& variety
Food High High
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Nest
Productive sagebrush cover –
Classes 4,5 (15-25%)
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Marginal sagebrush cover –
Class 3 (10%)
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Insufficient sagebrush cover –
Classes 1,2 (5%)
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A columnar structure provides
less cover and leaves nests more
visible to predators.
Preferred spreading branch
form.
15-30 in
height
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Successful nest Unsuccessful nest
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Habitat Feature Habitat Use Productive Habitat
Sagebrush canopy cover Cover 10-25%
Sagebrush height Cover 15-30 inches
Proximity of sagebrush
cover
Cover Sagebrush cover is
adjacent (<100 yards) to
brood-rearing areas
Grass & forb canopy cover Cover & Food ≥ 15%
Riparian & wet meadows Food Wetland plant species
dominate
Riparian & wet meadow
stability
Cover & Food Some bare ground may be
evident but vegetative
cover dominates the site
Forb availability in uplands
& wet areas
Food Succulent forbs are readily
available in terms of
distribution & plant
structure
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Habitat
Feature
Habitat
Use
Productive
Habitat
Sagebrush
canopy
cover
Cover &
Food
10-30%
Sagebrush
height
Cover &
Food
10-14
inches
above snow
level
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Sage-grouse do best in landscapes with:
• >70% sagebrush cover
• <3% development
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If >30% of sagebrush is lost in a landscape: • Likelihood of occupancy decreases
• Population persistence decreases
• Changes to landscape structure are detrimental
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Wildfire
Invasive weeds/Wildfire-exotic annual grass cycle
Juniper expansion
Prescribed fire
Vegetation treatments (e.g., sagebrush removal)
Improper livestock grazing
Predation
Realty (e.g., land use changes)
Energy development and transmission
Recreation
West Nile Virus
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Oil or gas wellheads/energy development
Roads
Buildings
Powerlines
Center-pivots/agriculture
Wind turbines
Communication towers
Fences
Noise
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?
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70/30 Goal
Conserve >70% of sage-grouse habitat
Approximates the current status of intact
and disturbed habitat in Oregon
Science-based, i.e., 70% serves as a
biological threshold
Ensures goals are being met at both
local & regional scales
No net loss
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90% of the breeding population
Only 38% of the range
Identifies the most productive landscapes
Represents a fraction of the occupied range
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How do we establish
acceptable levels of
disturbance in core
habitat?
How can ODFW and
other participating
agencies coordinate
their conservation
efforts with
SAGECON?
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