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Common Birds Census
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KESTREL Falco tinnunculus
 
Conservation Listings Long term trend

Table 4/Amber
(25-49% Population decline)
Biodiversity Steering Group
Conservation Concern List

UK: Moderate decline since mid 1970s
 
Status Summary
Kestrels had recovered from the deleterious effects of organochlorine pesticides by the mid-1970s, the recovery probably driven by improving nesting success, but subsequently declined rapidly. The decline in failure rates at the egg stage (c.28 days from laying the first egg) is from 16% down to 3%. The population decline has been linked to the effects of agricultural intensification on farmland habitats and small mammal populations (Gibbons et al. 1993). The CBC indicates that abundance has been stable for the last 15 years, but the BBS suggests that a further decline has occurred since 1994.
 
 
Table of population changes for Kestrel
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC all habitats 30 1968-1998 81 -5 -31 36    
  25 1973-1998 85 -26 -44 -2 >25  
  10 1988-1998 72 7 -8 25    
  5 1993-1998 75 -2 -13 11    
BBS UK 5 1994-1999 502 -30 -38 -21 (>25)  
BBS England 5 1994-1999 431 -19 -28 -8    
BBS Scotland 5 1994-1999 42 -61 -75 -39 (>50) Small sample
The Breeding Bird Survey is jointly funded by BTO, JNCC and RSPB
 
 
Table of productivity information for Kestrel
Variable Period
(yrs)
Years Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Clutch size 30 1968-1998 52 None        
Brood size 30 1968-1998 113 Linear increase 3.82 chicks 4.16 chicks 0.34 chicks  
Daily failure rate (eggs) 30 1968-1998 41 Linear decline 0.0064 nests/day 0.001 nests/day -0.0054 nests/day  
Daily failure rate (chicks) 30 1968-1998 62 None        
Laying date 30 1968-1998 21 None       Small sample
 
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: 18 April, 2001

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