Raptor and Corvid Use of Utility Poles: An Assessment of the Efficacy of Perch Deterrents Presented...
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Transcript of Raptor and Corvid Use of Utility Poles: An Assessment of the Efficacy of Perch Deterrents Presented...
![Page 1: Raptor and Corvid Use of Utility Poles: An Assessment of the Efficacy of Perch Deterrents Presented by: Phoebe R. Prather Advisor: Dr. Terry A. Messmer.](https://reader036.fdocuments.net/reader036/viewer/2022062322/5697bf881a28abf838c89782/html5/thumbnails/1.jpg)
Raptor and Corvid Use of Utility Poles:
An Assessment of the Efficacy of Perch Deterrents
Presented by: Phoebe R. PratherAdvisor: Dr. Terry A. Messmer
Jack H. Berryman InstituteUtah State University
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![Page 3: Raptor and Corvid Use of Utility Poles: An Assessment of the Efficacy of Perch Deterrents Presented by: Phoebe R. Prather Advisor: Dr. Terry A. Messmer.](https://reader036.fdocuments.net/reader036/viewer/2022062322/5697bf881a28abf838c89782/html5/thumbnails/3.jpg)
Previous Research• Man-made vertical structures are believed
to lead to increased: • Raptor and corvid visitation.• Access to habitats.• Availability of perch, nesting, and roosting sites.• Foraging and predation efficiency.
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Fragmentation
• Divides suitable habitat.
• Increases isolation of populations.
• Abandonment of sites.
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Management Need• Evaluation of effects of human
infrastructure such as power lines on population.
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Conservation Strategy
• Retrofitting structures with perch discouragers to deter raptors and corvids from perching.
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Study Objective
• Test the efficacy of five types of perch discouragers on reducing the number of perching events of raptors and corvids.
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Study Site
• Gunnison Sage-grouse Conservation Study Area, San Juan County, Utah.
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Study Site
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Discouragers
One Fire Fly Two Fire Flies
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Discouragers
Cones(Kaddas)
Triangles
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Discouragers
No treatmentSpikes(Mini-zena)
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Study (2007-2008) • 7.5 miles of power line with 84 poles.
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Methods
• Divided into 14 blocks of 6 poles. – Each block
contained one of each discourager and a control.
– Treatments and control were randomly assigned.
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Methods - Surveys• Began mid-January, finish end of April.
• Surveyed twice a day, five days a week.
• Entire line walked once a week.– Evidence of depredation events and
electrocutions.
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Methods - Survey Protocol
• Starting point (east or west) randomly selected.
• Alternate routes taken to starting point.
• Five minutes spent at starting point and each mile point.
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Methods - Survey Protocol• Observations:
– Species and numbers of individuals within a quarter mile of either side of the powerline.
• Flying, on ground, perched on trees, fences or poles of a different line.
– Species and numbers of individuals perched on the study poles.
• Individual counted more than once if continued down the line perching on different poles.
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Methods– Exact positions of birds on study poles.
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Results
• No signs of electrocutions.
• One dead grouse on the road.
• Observations of grouse near road.
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Results
Golden Eagle 278Common Raven 39Red-tailed Hawk 35Rough-legged Hawk 15Northern Harrier 8Unknown 2Ferruginous Hawk 1
2007
Golden Eagle 230Common Raven 23Rough-legged Hawk 9Ferruginous Hawk 3Bald Eagle 2Unknown 1
2008
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2007 Results
Golden Eagles
0
10
20
30
40
50
60
70
1FF control triangles cones spikes 2FF
Treatment
Pe
rch
ing
Ev
en
ts
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2007 Results
Cross Arm
05
1015202530354045
control spikes cones triangles 1FF 2FF
Treatments
Per
chin
g E
ven
tsGOLDEN EAGLE
Insulator Cover
05
1015202530354045
control spikes cones triangles 1FF 2FF
Treatments
Per
chin
g E
ven
ts
•Total:•278 perching events.
•Cross Arm: 122•Insulator Cover: 156
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2008 Results
Golden Eagles
0
10
20
30
40
50
60
70
80
90
1FF 2FF control cones spikes triangles
Treatment
Pe
rch
ing
Ev
en
ts
![Page 24: Raptor and Corvid Use of Utility Poles: An Assessment of the Efficacy of Perch Deterrents Presented by: Phoebe R. Prather Advisor: Dr. Terry A. Messmer.](https://reader036.fdocuments.net/reader036/viewer/2022062322/5697bf881a28abf838c89782/html5/thumbnails/24.jpg)
GOLDEN EAGLE 2008 Results
Total:231 perching events.
Cross Arm: 112Insulator Cover: 119
Cross Arm
010203040506070
control spikes cones triangles 1FF 2FF
Treatment
Per
chin
g E
ven
ts
Insulator Cover
010203040506070
control spikes cones triangles 1FF 2FF
Treatments
Per
chin
g E
ven
ts
![Page 25: Raptor and Corvid Use of Utility Poles: An Assessment of the Efficacy of Perch Deterrents Presented by: Phoebe R. Prather Advisor: Dr. Terry A. Messmer.](https://reader036.fdocuments.net/reader036/viewer/2022062322/5697bf881a28abf838c89782/html5/thumbnails/25.jpg)
Results
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Discussion- Problems
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Discussion- Problems
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Discussion
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Discussion
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Conclusions
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Acknowledgments
• Advisor: Dr. Terry Messmer
• Funding: – PacifiCorp– Avian Power Line Interaction Committee.– Bureau of Land Management
• Field Technician Erin Colin.
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Questions?