preliminary assessment of bird strikes at windows in...
TRANSCRIPT
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Preliminary
Assessment of Bird
Strikes at Windows in
Eastern Washtenaw
County, MI
Washtenaw Safe Passage
& Great Lakes/Detroit Safe Passage
Heidi Trudell & Alice Elliott
Ruby-throated Hummingbird
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Alice Elliott
Ann Arbor & Ypsilanti
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• Birds are important
• Dead birds are important
• Birds don’t see glass
• Window collisions
• Decals* and noise makers
• Action is required
…for the planet
…salvage for research
...transparent or reflective
…highly preventable
...DO NOT WORK
…inaction doesn’t make it better
Bird / Window Collisions
GENERAL ASSUMPTIONS
Unfriendly Skies: Birds, Buildings, and Collision
* Decals, stickers, silhouettes, decoys, etc - need such
close spacing that they’re never applied correctly
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• Low rise buildings
• Non-residential* buildings
• Diurnal collisions only
• Not a “lights out” issue
• Not feeder related
• Not generally panic related
…less than 12 floors, most <5
...campus, office park, etc
…midday surveys optimal
...at least not directly
…no feeders/few feeder species
...maybe on occasion
Bird / Window Collisions
ASSUMPTIONS FOR THIS STUDY
* Some dorms were surveyed
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Initial Objectives:
● Opportunistic Citizen Science
● Salvage specimens for University
of Michigan Museum of Zoology
● Collect data
○ Rank threats
○ Compare notes!
● Prevent collisions ASAP
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Location # Dead Birds Survivors
14a2 Dist Courthouse 9
Ypsilanti District Library 8 3
EMU: Boone 4
EMU: Halle Library 3
EMU: Phelps 1
EMU: Putnam 1
EMU: Student Center 3
EMU: Walton 4
EMU Total: 16
Spring 2016 Total: 33 3
Location # Dead Birds Survivors
14a2 Dist Courthouse 12
Ypsilanti District
Library 7 3
EMU: Halle Library 3
EMU: Pierce 1
EMU: Putnam 4
EMU: Sellers 3
EMU: Walton 2
EMU: Incidental/Other 5 1
EMU Total: 18 1
Summer 2016 Total: 37 5
Spring 2016: 14 species
Summer 2016: 14 species
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Location # Dead Birds Survivors
14a2 Dist Courthouse 9
Ypsilanti District Library 8 3
EMU: Boone 4
EMU: Halle Library 3
EMU: Phelps 1
EMU: Putnam 1
EMU: Student Center 3
EMU: Walton 4
EMU Total: 16
Spring 2016 Total: 33 3
Location # Dead Birds Survivors
14a2 Dist Courthouse 12
Ypsilanti District
Library 7 3
EMU: Halle Library 3
EMU: Pierce 1
EMU: Putnam 4
EMU: Sellers 3
EMU: Walton 2
EMU: Incidental/Other 5 1
EMU Total: 18 1
Summer 2016 Total: 37 5
Spring 2016: 14 species
Summer 2016: 14 species
Total Species? 24
American Goldfinch
American Robin
Black-capped Chickadee
Belted Kingfisher
Cedar Waxwing
Common Grackle
Common Yellowthroat
Empidonax Sp
Eurasian Starling
Eastern Wood-Pewee
Golden-crowned Kinglet
House Finch
House Sparrow
Indigo Bunting
Killdeer
Mourning Dove
Ovenbird
Red-eyed Vireo
Rock Pigeon
Ruby-throated Hummingbird
Red-winged Blackbird
Song Sparrow
White-throated Sparrow
Yellow-billed Cuckoo
Yellow Warbler
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Reminder: no scavenging or efficiency numbers
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How surveyable?
14a2 = 2/3 access/parking
YDL = ¾ accessible
Halle = ⅓ accessible
Similar for others
* Fall = Aug 15 - Oct 31
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Sellers Hall, Eastern Michigan University
Avg strike
mortality: 54-
76%
(Klem 1990)
Implication:
Double the
numbers, min.
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Eastern Michigan University
Annual Averages:
Single-family residence: 2-8
Residence w/feeders: 16-24+
Low-rise (<11 floors): 21-24
High-rise (12+ floors): 24**highly variable, max known = 3,000
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Extremely broad
generalizations re:
seasonal strike
detection ratios
based on problem
MI buildings:
Spring = ~5-10+
Summer = ~5-15+
Fall = ~20-35+
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Sellers Hall, Eastern Michigan University
Greater Detroit high-rises: ~195 (~4,680
birds/yr)
Greater Detroit low-rises: ????
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YPSILANTI
DISTRICT
LIBRARY
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Map: topoquest.com
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Snapshot: Fall 2015 - Fall 2016
● Constants: vegetation, lighting, glass.
● “Bird deterrent” installed Spring 2016
● 117 strike detections for ~2 year span○ Pre-F15 = ~32
○ F15 = ~36
○ SP16 = 9
○ SU16 = 12
○ F16 = 28
Reminder: ~50% survive, ?% die elsewhere
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No shortage of windows:
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June 23, 2016
“The 42-day-old chick is believed
to have flown into glass on a
parking garage next to the Circuit
Court in downtown Mt. Clemens…”
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Eastern Michigan University
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Alice Elliott
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Alice Elliott
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Alice Elliott
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Alice Elliott
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Alice Elliott
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Alice Elliott
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DETROIT
AUDUBON
WASHTENAW
AUDUBON
GREAT LAKES SAFE PASSAGE
WASHTENAW SAFE PASSAGE
• RESEARCH
• OUTREACH
• ADVOCACY
• EDUCATION
• CONSERVATION
detroitaudubon.org washtenawaudubon.org
[email protected]@gmail.com
@justsavebirds
Washtenaw
Safe
Passage