3.6 Threat: Transportation and service corridors
p. 168-171
Texte intégral
3.6.1 Verges and airports
Likely to be beneficial
Scare or otherwise deter birds from airports
1Two replicated studies in the UK and USA found that fewer birds used areas of long grass at airports, but no data were provided on the effect of long grass on strike rates or bird mortality. Assessment: likely to be beneficial (effectiveness 50 %; certainty 44 %; harms 0 %).
2http://www.conservationevidence.com/actions/261
Unknown effectiveness (limited evidence)
Mow roadside verges
3A single replicated, controlled trial in the USA found that mowed roadside verges were less attractive to ducks as nesting sites, but had higher nesting success after four years. Assessment: unknown effectiveness — limited evidence (effectiveness 30 %; certainty 30 %; harms 9 %).
4http://www.conservationevidence.com/actions/259
No evidence found (no assessment)
5We have captured no evidence for the following intervention:
- Sow roadside verges
3.6.2 Power lines and electricity pylons
Beneficial
Mark power lines
6A total of eight studies and two literature reviews from across the world found that marking power lines led to significant reductions in bird collision mortalities. Different markers had different impacts. Assessment: beneficial (effectiveness 81 %; certainty 85 %; harms 0 %).
7http://www.conservationevidence.com/actions/265
Likely to be beneficial
Bury or isolate power lines
8A single before-and-after study in Spain found a dramatic increase in juvenile eagle survival following the burial or isolation of dangerous power lines. Assessment: likely to be beneficial (effectiveness 60 %; certainty 44 %; harms 0 %).
9http://www.conservationevidence.com/actions/262
Insulate electricity pylons
10A single before-and-after study in the USA found that insulating power pylons significantly reduced the number of Harris’s hawks electrocuted. Assessment: likely to be beneficial (effectiveness 60 %; certainty 45 %; harms 0 %).
11http://www.conservationevidence.com/actions/268
Remove earth wires from power lines
12Two before-and-after studies from Norway and the USA describe significant reductions in bird collision mortalities after earth wires were removed from sections of power lines. Assessment: likely to be beneficial (effectiveness 90 %; certainty 60 %; harms 0 %).
13http://www.conservationevidence.com/actions/263
Use perch-deterrents to stop raptors perching on pylons
14A single controlled study in the USA found that significantly fewer raptors were found near perch-deterrent lines, compared to controls, but no information on electrocutions was provided. Assessment: likely to be beneficial (effectiveness 50 %; certainty 45 %; harms 0 %).
15http://www.conservationevidence.com/actions/269
Unknown effectiveness (limited evidence)
Thicken earth wires
16A single paired sites trial in the USA found no reduction in crane species collision rates in a wire span with an earth wire three times thicker than normal. Assessment: unknown effectiveness — limited evidence (effectiveness 0 %; certainty 25 %; harms 0 %).
17http://www.conservationevidence.com/actions/264
Unlikely to be beneficial
Add perches to electricity pylons
18A single before-and-after study in Spain found that adding perches to electricity pylons did not reduce electrocutions of Spanish imperial eagles. Assessment: unlikely to be beneficial (effectiveness 0 %; certainty 42 %; harms 0 %).
19http://www.conservationevidence.com/actions/267
Reduce electrocutions by using plastic, not metal, leg rings to mark birds
20A single replicated and controlled study in the USA found no evidence that using plastic leg rings resulted in fewer raptors being electrocuted. Assessment: unlikely to be beneficial (effectiveness 0 %; certainty 42 %; harms 0 %).
21http://www.conservationevidence.com/actions/270
Use raptor models to deter birds from power lines
22A single paired sites trial in Spain found that installing raptor models near power lines had no impact on bird collision mortalities. Assessment: unlikely to be beneficial (effectiveness 0 %; certainty 43 %; harms 0 %)
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