Bird collisions with power lines – an experiment with ptarmigan (Lagopus spp.)

  • Published source details Bevanger K. & Brøseth H. (2001) Bird collisions with power lines – an experiment with ptarmigan (Lagopus spp.). Biological Conservation, 99, 341-346.


This study is summarised as evidence for the following.

Action Category

Remove earth wires to reduce incidental bird mortality

Action Link
Bird Conservation
  1. Remove earth wires to reduce incidental bird mortality

    A controlled before-and-after trial between 1989 and 1995 in boreal and subalpine forests in southern Norway (Bevanger & Broseth 2001) found a 51% decrease in collision mortality of willow grouse Lagopus lagopus and rock ptarmigan L. mutus by a 2.5 km section of 22 kV power line from which the earth wire was removed (49 fatalities before removal, 24 afterwards). There was no corresponding decrease in two control sections (61 vs. 50 fatalities and 20 vs. 27 fatalities). The earth wire was located 1.5 m below the phase conductor lines.


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