Collected Evidence: Collected Evidence: Bury or isolate power lines to reduce incidental bird mortalityA single before-and-after trial in Spain showed a dramatic increase in the survival of juvenile Spanish imperial eagles Aquila adalberti following the burial or isolation of power lines.  Collected, 19 Jul 2012 13:31:11 +0100Collected Evidence: Collected Evidence: Remove earth wires to reduce incidental bird mortalityA before-and-after study and a literature review describe significant reductions in collision mortalities of cranes Grus spp. and grouse Lagopus spp. following the removal of earth wires.  Collected, 19 Jul 2012 13:41:42 +0100Collected Evidence: Collected Evidence: Thicken earth wire to reduce incidental bird mortalityA literature review found no evidence that thickening the earth wire had any impact on collision mortality of cranes Grus spp.  Collected, 19 Jul 2012 13:48:14 +0100Collected Evidence: Collected Evidence: Mark power lines to reduce incidental bird mortality A total of eight studies and two literature reviews from across the world found that marking power lines led to significant reductions in collision rates or dangerous flight behaviour (i.e. approaching close to power lines) in cranes Grus spp., mute swans Cygnus olor and other bird species. All markers except thin, black plastic strips or neoprene crosses were effective, with no differences in effectiveness between Bird Flight Diverters (BFDs: brightly coloured plastic spirals) and static fibreglass plates and only a small possible difference between BFDs and ‘flappers’ (moving markers).  Collected, 19 Jul 2012 14:03:03 +0100Collected Evidence: Collected Evidence: Use raptor models to deter birds and so reduce incidental mortalityA single paired sites study in Spain found no evidence that raptor models were effective in deterring birds from crossing power lines and may even have attracted some species to the area.  Collected, 19 Jul 2012 14:53:56 +0100Collected Evidence: Collected Evidence: Add perches to electricity pylons to reduce electrocutionA single before-and-after study in Spain found that adding perches did not reduce electrocutions of Spanish imperial eagles Aquila adalberti.  Collected, 19 Jul 2012 16:08:34 +0100Collected Evidence: Collected Evidence: Insulate power pylons to prevent electrocutionA single before-and-after study in the USA found the insulating power pylons significantly reduced the number of Harris’s hawks Parabuteo unicinctus electrocuted.  Collected, 19 Jul 2012 16:10:27 +0100Collected Evidence: Collected Evidence: Use perch-deterrents to stop raptors perching on pylonsA single controlled study from the USA found significantly lower raptor activity close to perch-deterrent power lines, compared to control lines. No data were provided on electrocution rates.  Collected, 19 Jul 2012 16:21:29 +0100Collected Evidence: Collected Evidence: Reduce electrocutions by using plastic, not aluminium, leg rings to mark birdsA replicated and controlled study in the USA found no evidence for lower electrocution rates for raptors marked with plastic leg rings, compared to metal ones.  Collected, 19 Jul 2012 16:27:10 +0100
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What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

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