Better way to keep birds from hitting power lines

Date:
June 24, 2020
Source:
Oregon State University
Summary:
Suspended, rotating devices known as ''flappers'' may be the key
to fewer birds flying into power lines, a new study suggests.



FULL STORY ========================================================================== Suspended, rotating devices known as "flappers" may be the key to
fewer birds flying into power lines, a study by Oregon State University suggests.


==========================================================================
The findings by researchers in OSU's College of Agricultural Sciences
are important because around the globe both the number of power lines
and concern over bird fatalities are on the rise.

Research has documented more than 300 species of birds dying from hitting
power lines, with one study estimating that more than 170 million perish annually in the United States and another estimating the global death
toll to be 1 billion per year. There's also the problem of power outages
that bird strikes can cause.

Conservation managers and utilities many years ago developed flight
diverters, basically regularly spaced devices that make the lines more
visible, as a step toward reducing the number of birds flying into
the lines.

The most common type are the PVC spirals, which are durable and easy to install, but how well they actually work isn't well understood. Though
they've been in use for nearly four decades, strike rates remain high
for a number of species.

OSU researchers Virginia Morandini and Ryan Baumbusch were part of an international collaboration that compared the effectiveness of three
types of flight diverters: yellow PVC spiral; orange PVC spiral; and
a flapper model with three orange and red polypropylene blades with
reflective stickers.



==========================================================================
The flapper hangs from a power line and its blades, 21 centimeters by
6.2 centimeters, rotate around a vertical axis.

The three-year study took place in southern Spain, and almost 54
kilometers of power lines were used in the research. Ten kilometers were
marked with yellow spirals, 13 kilometers were marked with orange spirals, another 13 had flappers, and 16 kilometers had no markers, thus serving
as a control. All three flight diverter types were spaced every 10 meters.

Field workers combed the area under the lines every 40 days for evidence
of birds killed by power lines and found a total of 131 such birds
representing 32 species.

The research suggested the flappers were responsible for a 70% lower
average death rate compared to the control. The findings also showed the spirals were better than no diverters, but significantly less effective
than the flappers.

"Colored PVC spiral is the most commonly used flight diverter by far,
but the flapper diverter was the one showing the largest reduction in
mortality with the lowest variation across different power lines, habitats
and bird communities," Morandini said. "We suggest to consider the flapper
as the first choice when installing bird flight diverters, recommending
to increase future research in testing its material durability and
resistance against vibrations and color loss." The flappers and PVC
spirals have comparable materials and production costs, researchers say,
with flappers being easier and faster to install.

That's important because power companies must keep a line discharged
during the diverter installation process -- losing money because
electricity is not flowing through the line -- so the time required to
install diverters is the most important factor when considering costs.


========================================================================== Story Source: Materials provided by Oregon_State_University. Original
written by Steve Lundeberg. Note: Content may be edited for style
and length.


========================================================================== Journal Reference:
1. Miguel Ferrer, Virginia Morandini, Ryan Baumbusch, Roberto Muriel,
Manuela De Lucas, Cecilia Calabuig. Efficacy of different types of
"bird flight diverter" in reducing bird mortality due to collision
with transmission power lines. Global Ecology and Conservation,
2020; 23: e01130 DOI: 10.1016/j.gecco.2020.e01130 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/06/200624151533.htm

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