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Breeding Bird Survey
Common Birds Census
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TREECREEPER Certhia familiaris
 
Conservation Listings Long term trend

Unlisted/Green
Biodiversity Steering Group
Conservation Concern List

UK: Fluctuating with no long-term trend
 
Status Summary
The UK Treecreeper population has been roughly stable since the late 1970s, but this population level represents a decline from a mid-1970s peak. Detailed study has shown that Treecreeper numbers and survival rates are reduced by wet winters (Peach et al. 1995b). There is a suggestion of a further, recent, shallow decline but confidence intervals are wide and the CES abundance index shows the opposite pattern. Although CES productivity shows no trend over time, there has been a significant fall in the nest failure rates at the egg stage (18 days, comprising 14 days incubation + 4 days laying) from 31% to 12%.
 
 
Table of population changes for Treecreeper
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC all habitats 30 1968-1998 101 -1 -22 27    
  25 1973-1998 105 -25 -40 -9    
  10 1988-1998 103 -2 -15 8    
  5 1993-1998 105 -1 -10 7    
CBC farmland 30 1968-1998 30 -25 -55 9    
  25 1973-1998 30 -44 -66 -22 >25  
  10 1988-1998 25 -16 -43 18    
  5 1993-1998 25 -8 -34 21    
CBC woodland 30 1968-1998 57 5 . .    
  25 1973-1998 62 -19 . .    
  10 1988-1998 69 -3 . .    
  5 1993-1998 72 -2 . .    
CES adults 14 1984-1998 37 25 . .    
  10 1988-1998 44 25 . .    
  5 1993-1998 46 16 . .    
CES juveniles 14 1984-1998 56 15 . .    
  10 1988-1998 66 20 . .    
  5 1993-1998 73 -2 . .    
BBS UK 5 1994-1999 260 41 21 65    
BBS England 5 1994-1999 195 19 0 42    
BBS Scotland 5 1994-1999 27 86 11 210   Small sample
BBS Wales 5 1994-1999 33 75 11 178   Small sample
The Breeding Bird Survey is jointly funded by BTO, JNCC and RSPB
 

 
Table of productivity information for Treecreeper
Variable Period
(yrs)
Years Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Clutch size 30 1968-1998 14 None       Small sample
Brood size 30 1968-1998 31 None        
Daily failure rate (eggs) 30 1968-1998 25 Linear decline 0.0206 nests/day 0.0071 nests/day -0.0135 nests/day Small sample
Daily failure rate (chicks) 30 1968-1998 25 None       Small sample
Laying date 30 1968-1998 14 Linear decline day 127 day 120 -7 days Small sample
Percentage juveniles (CES) 14 1984-1998 63 Smoothed trend 112 productivity index 100 productivity index -11%  
Percentage juveniles (CES) 10 1988-1998 74 Smoothed trend 124 productivity index 100 productivity index -19%  
Percentage juveniles (CES) 5 1993-1998 80 Smoothed trend 128 productivity index 100 productivity index -22%  
 

 

   



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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