Present address: School of Biological Sciences, University of Bristol, Woodlands Road, Bristol BS8 1UG, UK.
Factors affecting predation by buzzards Buteo buteo on released pheasants Phasianus colchicus
Article first published online: 21 DEC 2001
Journal of Applied Ecology
Volume 38, Issue 4, pages 813–822, August 2001
How to Cite
Kenward, R.E., Hall, D.G., Walls, S.S. and Hodder, K.H. (2001), Factors affecting predation by buzzards Buteo buteo on released pheasants Phasianus colchicus. Journal of Applied Ecology, 38: 813–822. doi: 10.1046/j.1365-2664.2001.00636.x
- Issue published online: 21 DEC 2001
- Article first published online: 21 DEC 2001
- game management;
- prey density;
- release pens
- 1Information on the effects of wildlife predation on game and livestock is required to allow improved management of all organisms involved. Monitoring of prey, predators and predation mechanisms each suggests important methods, illustrated here by data from common buzzards Buteo buteo and ring-necked pheasants Phasianus colchicus.
- 2Location data from 136 radio-tagged common buzzards, together with prey remains from 40 nest areas, records from 10 gamekeepers and vegetation surveys, were used to investigate raptor predation at 28 pens from which pheasants were released in southern England.
- 3Among 20 725 juvenile pheasants released in 1994–95, gamekeepers attributed 4·3% of deaths to buzzards, 0·7% to owls, 0·6% to sparrowhawks, 3·2% to foxes and 0·5% to other mammals.
- 4Fresh pheasant remains were found on 7% of 91 visits to buzzard nests, and 8% of radio-tagged buzzards had significantly more association than other buzzards with pheasant pens.
- 5Predation by buzzards was most likely to be recorded at release pens with little shrub cover, deciduous canopies and a large number of released pheasants. The number of pheasants killed was greatest in large pens with extensive ground cover, and the highest proportion of released pheasants was killed in large pens where few were released. However, only 21% of 55 releases had > 2 pheasant kills per week.
- 6Radio-tagged buzzards were located most often at pheasant-release pens with open, deciduous canopies. Pens were most likely to be visited by buzzards that had fledged nearby, but the proximity of buzzard nests had little influence on how much predation occurred.
- 7Only a minority of buzzards associated frequently with pheasant pens, and predation was heavy at only a minority of sites, where pen characteristics and release factors probably made it easy for individual buzzards to kill pheasants. We suggest that the occasional heavy losses could be avoided by encouraging shrubs rather than ground cover in pens, by siting pens where there are few perches for buzzards, and perhaps also by high-density releases.