raptor and corvid use of distribution line power poles:
DESCRIPTION
Raptor and Corvid Use of Distribution Line Power Poles:. An Assessment of the Efficacy of Perch Deterrents. Previous Research. Man-made vertical structures are believed to lead to increased: Raptor and corvid visitation. Access to habitats. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/1.jpg)
Raptor and Corvid Use of Distribution Line Power Poles:
An Assessment of the Efficacy of Perch Deterrents
![Page 2: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/2.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.
![Page 3: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/3.jpg)
Fragmentation
• Divides suitable habitat.
• Increases isolation of populations.
• Abandonment of sites.
![Page 4: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/4.jpg)
Study Objective
• Test the efficacy of five types of perch deterrents on reducing the number of perching events of raptors and corvids.
![Page 5: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/5.jpg)
Study Site
![Page 6: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/6.jpg)
Perch Deterrents
One Fire Fly Two Fire Flies
![Page 7: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/7.jpg)
Discouragers
Cones(Kaddas)
Triangles
![Page 8: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/8.jpg)
Discouragers
No treatmentSpikes(Mini-zena)
![Page 9: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/9.jpg)
Study (2007-2008) • 7.5 miles of power line with 84 poles.
![Page 10: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/10.jpg)
Methods
• Divided into 14 blocks of 6 poles. – Each block contained
one of each discourager and a control.
– Treatments and control were randomly assigned.
![Page 11: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/11.jpg)
Survey Methods• Began mid-January, finish end of April.• Surveyed twice a day, five days a week.• Five minutes spent at starting point and each
mile point.• Recorded species and numbers of individuals perched on the study poles.
![Page 12: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/12.jpg)
Analysis
• 1) Did the total count of perching events recorded by treatment and control in 2007 and 2008 differ by perch deterrent type and year?
• 2) Did the total counts for each species on each type of deterrent and control in 2007 and 2008 differ?
![Page 13: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/13.jpg)
Results
2007 SpeciesGolden eagle 278Common raven 39Red-tailed hawk 35Rough-legged Hawk 35Northern harrier 8Unknown 2Ferruginous hawk 1
2008 SpeciesGolden eagle 230Common raven 23Rough-legged hawk 9Ferruginous hawk 3Bald eagle 2Unknown 1
168 survey hours.253 perching events.
84 survey hours.136 perching events.
![Page 14: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/14.jpg)
Results - 20072007
Species Cones Mini zena Triangles Controln n n n F p
Golden eagle 42 35 51 67 2.6 0.07
Common raven 9 13 8 7 0.5 0.46Rough-legged hawk 5 6 3 7 0.5 0.71Total 56 54 62 81 1.2 0.31% perching events 22 21 25 32
• Golden eagles 77% of perching events.• Perching events did not differ by deterrent or control (p = 0.31).• Perching events did not differ by species.
![Page 15: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/15.jpg)
Results - 20082008
Species Cones Mini zena Triangles Controln n n n F p
Golden eagle 33 24 19 34 1.2 0.33Common raven 1 6 3 8 1.5 0.22Rough-legged hawk 2 2 1 3 0.2 0.91Total 36 32 23 45 1.9 0.15% perching events 26 24 17 33
• Golden eagles 81% of perching events.• Perching events did not differ by deterrent or control (p = 0.15).• Perching events did not differ by species.
![Page 16: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/16.jpg)
Results
![Page 17: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/17.jpg)
Results
![Page 18: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/18.jpg)
Discussion - Fire Flies
![Page 19: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/19.jpg)
Discussion - Fire Flies
![Page 20: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/20.jpg)
Discussion
• Use cross arm deterrents in combination with insulator deterrents.
![Page 21: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/21.jpg)
Acknowledgements• Advisor: Dr. Terry Messmer.• Committee:
– Dr. Eugene Schupp, Dr. Chris Call, Dr. Fred Provenza, Dr. Tim Graham
• Funders:– BLM and NRCS– Endangered Species Mitigation
Fund– PacifiCorp– Jack H. Berryman Institute
• Todd Black (and family)• Tammy Wallace (BLM)• Guy Wallace (UDWR)• Canyon Country Youth Corp.• Monticello/Dove Creek LWG• Private Landowners• Family and friends• My dog Jake
![Page 22: Raptor and Corvid Use of Distribution Line Power Poles:](https://reader036.vdocuments.us/reader036/viewer/2022062222/56816726550346895ddbb817/html5/thumbnails/22.jpg)