Evaluation of two power line markers to reduce crane and waterfowl collision mortality

  • Published source details Brown W.M. & Drewien R.C. (1995) Evaluation of two power line markers to reduce crane and waterfowl collision mortality. Wildlife Society Bulletin, 23, 217-227.


This study is summarised as evidence for the following.

Action Category

Mark power lines to reduce incidental bird mortality

Action Link
Bird Conservation
  1. Mark power lines to reduce incidental bird mortality

    A paired sites study in autumn and spring 1988-1991 in mixed wetlands, croplands and uplands in south-central Colorado, USA (Brown & Drewien 1995), found that collision mortality was 61% lower in four spans marked by ‘dampers’ and 63% lower in four spans marked by ‘plates’ compared with eight unmarked spans. Birds also reacted to marked lines earlier and flew over them at a greater height. ‘Dampers’ were yellow, spiral vibration dampers, 112-125 cm long, placed at 3.3 m intervals; ‘plates’ were yellow fibreglass plates, 30.5 x 30.5 cm with a 5 cm diagonal black strip, placed at 23-32 m intervals. Both markers were placed on two spans of 7.2 kV distribution lines and two of 69-115 kV transmission lines, with all spans totalling 13.2 km. Most birds killed were sandhill cranes Grus canadensis and wildfowl.


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