Contents of report
Breeding Bird Survey
Common Birds Census
Constant Effort Sites
Nest Record Scheme
Waterways Bird Survey
Alerts
Summary
What the categories mean
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BUZZARD Buteo buteo
 
Conservation Listings Long term trend

Unlisted/Green
Biodiversity Steering Group Conservation Concern List

UK: Increase
 
Status Summary
The CBC shows a significant recent increase in Buzzard abundance but does not cover the species' northern and western strongholds well. This pattern is supported, however, by increases in the BBS for all of the UK and England and Scotland individually. The increase reflects population expansion to the south and east and has been associated with improving nesting success, perhaps through reduced persecution (Elliott & Avery 1991), the recovery of Rabbit populations from the effects of myxomatosis and release from the deleterious effects of organochlorine pesticides. The decline in failure rates at the egg stage (c.42 days from laying the first egg) is from 23% down to 9%.
 
 
Table of population changes for Buzzard
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC all habitats 30 1968-1998 22 332 204 954   Unrepresentative?
  25 1973-1998 24 290 181 719   Unrepresentative?
  10 1988-1998 31 175 107 363   Unrepresentative?
  5 1993-1998 39 78 52 131   Unrepresentative?
BBS UK 5 1994-1999 414 29 16 44    
BBS England 5 1994-1999 225 29 12 49    
BBS Scotland 5 1994-1999 89 44 12 86    
BBS Wales 5 1994-1999 92 0 -20 26    
The Breeding Bird Survey is jointly funded by BTO, JNCC and RSPB
 
 
Table of productivity information
Variable Period
(yrs)
Years Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Clutch size 30 1968-1998 30 None        
Brood size 30 1968-1998 85 None        
Daily failure rate (eggs) 30 1968-1998 23 Linear decline 0.0062 nests/day 0.0022 nests/day -0.004 nests/day Small sample
Daily failure rate (chicks) 30 1968-1998 42 None        
 

 

Insufficient data on laying dates
available for this species

 


Insufficient data on CES
available for this species

 

 

   



The report should be cited as: Baillie, S.R., Crick, H.Q.P., Balmer, D.E., Bashford, R.I., Beaven, L.P., Freeman, S.N., Marchant, J.H., Noble, D.G., Raven, M.J., Siriwardena, G.M., Thewlis, R. and Wernham, C.V. (2001) Breeding Birds in the Wider Countryside: their conservation status 2000. BTO Research Report No. 252. BTO, Thetford. (http://www.bto.org/birdtrends)

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Last updated: 19 April, 2001

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