Evaluation of two power line markers to reduce crane and waterfowl collision mortality
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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.
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.
Actions
This study is summarised as evidence for the following.
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Mark power lines to reduce incidental bird mortality Action Link |
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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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