Raptor and Corvid Use of Distribution Line Power Poles: An Assessment of the Efficacy of Perch Deterrents.

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Presentation transcript:

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. Availability of perch, nesting, and roosting sites. Foraging and predation efficiency.

Fragmentation Divides suitable habitat. Increases isolation of populations. Abandonment of sites.

Study Objective Test the efficacy of five types of perch deterrents on reducing the number of perching events of raptors and corvids.

Study Site

Perch Deterrents One Fire Fly Two Fire Flies

Discouragers Cones (Kaddas) Triangles

Discouragers No treatmentSpikes (Mini-zena)

Study ( ) 7.5 miles of power line with 84 poles.

Methods Divided into 14 blocks of 6 poles. – Each block contained one of each discourager and a control. – Treatments and control were randomly assigned.

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.

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?

Results 2007Species Golden eagle278 Common raven39 Red-tailed hawk35 Rough-legged Hawk35 Northern harrier8 Unknown2 Ferruginous hawk1 2008Species Golden eagle230 Common raven23 Rough-legged hawk9 Ferruginous hawk3 Bald eagle2 Unknown1 168 survey hours. 253 perching events. 84 survey hours. 136 perching events.

Results SpeciesConesMini zenaTrianglesControl nnnnFp Golden eagle Common raven Rough-legged hawk Total % perching events 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.

Results SpeciesConesMini zenaTrianglesControl nnnnFp Golden eagle Common raven Rough-legged hawk Total % perching events 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.

Results

Discussion - Fire Flies

Discussion Use cross arm deterrents in combination with insulator deterrents.

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