The British Trust for Ornithology
DUNNOCK
Prunella modularis
Dunnock © Tommy Holden
Conservation listings

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

Long-term trend
UK: Moderate decline
Woodland: Rapid decline
Status summary
Dunnock abundance crashed between the mid-1970s and mid-1980s, after a period of population stability. Since the mid-1980s, no recovery has occurred but the CBC, CES and BBS all show abundance to have been stable. The cause of the decline remains unknown. There has been little variation in survival over time (Siriwardena et al. 1998a) and breeding performance tends to have increased.
Table of population changes for Dunnock
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC all habitats 31 1968-1999 205 -42 -50 -32 >25  
  25 1974-1999 210 -43 -51 -34 >25  
  10 1989-1999 189 -1 -10 11    
  5 1994-1999 191 6 0 12    
CBC farmland 31 1968-1999 93 -38 -49 -27 >25  
  25 1974-1999 93 -40 -51 -27 >25  
  10 1989-1999 92 7 -8 24    
  5 1994-1999 92 13 3 23    
CBC woodland 31 1968-1999 71 -56 -65 -44 >50  
  25 1974-1999 76 -54 -62 -42 >50  
  10 1989-1999 75 -12 -20 -1    
  5 1994-1999 77 -2 -9 5    
CES adults 15 1984-1999 93 -12 . .    
  10 1989-1999 108 -10 . .    
  5 1994-1999 115 -3 . .    
CES juveniles 15 1984-1999 90 -11 . .    
  10 1989-1999 105 -8 . .    
  5 1994-1999 113 -6 . .    
BBS UK 6 1994-2000 1467 8 3 13    
BBS England 6 1994-2000 1211 6 1 11    
BBS Scotland 6 1994-2000 100 10 -13 40    
BBS Wales 6 1994-2000 108 5 -13 26    
BBS N.Ireland 6 1994-2000 40 160 57 332   Small sample
The Breeding Bird Survey is jointly funded by BTO, JNCC and RSPB
Table of productivity information for Dunnock
Variable Period
(yrs)
Years Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Clutch size 31 1968-1999 103 Linear increase 3.91 eggs 4.19 eggs 0.28 eggs  
Brood size 31 1968-1999 108 Linear increase 3.42 chicks 3.67 chicks 0.25 chicks  
Daily failure rate (eggs) 31 1968-1999 144 Curvilinear 0.0269 nests/day 0.0268 nests/day -0.0001 nests/day  
Daily failure rate (chicks) 31 1968-1999 115 None        
Laying date 31 1968-1999 82 None        
Percentage juveniles (CES) 15 1984-1999 97 Smoothed trend 97 productivity index 100 productivity index 3%  
Percentage juveniles (CES) 10 1989-1999 113 Smoothed trend 99 productivity index 100 productivity index 1%  
Percentage juveniles (CES) 5 1994-1999 119 Smoothed trend 102 productivity index 100 productivity index -2%  




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This report should be cited as:
Baillie, S.R., Crick, H.Q.P., Balmer, D.E., Beaven, L.P., Downie, I.S., Freeman, S.N., Leech, D.I., Marchant, J.H.,
Noble, D.G., Raven, M.J., Simpkin, A.P., Thewlis, R.M. and Wernham, C.V.
(2002) Breeding Birds in the Wider
Countryside: their conservation status 2001. BTO Research Report No. 278. BTO, Thetford. (http://www.bto.org/birdtrends)

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