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BTO Blueline
DUNNOCK
Prunella modularis
Dunnock © Tommy Holden
Conservation listings

Europe: SPEC category 4, secure
UK: Amber (25-50% population decline)

Long-term trend
England: moderate decline
Status summary
Dunnock abundance fell substantially between the mid 1970s and mid 1980s, after a period of population stability. Some recovery has occurred throughout the UK since the late 1990s, but the species is still subject to Amber listing. The cause of the decline remains unknown. There has been little variation in survival rates over time (Siriwardena et al. 1998a) and although clutch and brood size has increased, so have failure rates at the egg stage, which may affect the ability of the species to recover.
CBC/BBS England graph
Table of population changes for Dunnock
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC/BBS England 33 1967-2000 425 -44 -51 -33 >25  
  25 1975-2000 507 -44 -51 -34 >25  
  10 1990-2000 935 1 -7 10    
  5 1995-2000 1425 6 3 10    
CES adults 17 1984-2001 92 -7 . .    
  10 1991-2001 108 3 . .    
  5 1996-2001 110 7 . .    
CES juveniles 17 1984-2001 89 -8 . .    
  10 1991-2001 105 0 . .    
  5 1996-2001 108 7 . .    
BBS UK 8 1994-2002 1483 13 7 18    
BBS England 8 1994-2002 1220 10 5 15    
BBS Scotland 8 1994-2002 99 15 -9 47    
BBS Wales 8 1994-2002 114 15 -3 37    
BBS N.Ireland 8 1994-2002 42 187 76 368    
BBS acknowledgement
CES adult abundance graph
CES juvenile abundance graph
BBS UK graph
BBS England graph
BBS Scotland graph
BBS Wales graph
BBS N Ireland graph
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 33 1968-2001 102 Linear increase 3.91 eggs 4.2 eggs 0.29 eggs  
Brood size 33 1968-2001 107 Linear increase 3.45 chicks 3.66 chicks 0.21 chicks  
Daily failure rate (eggs) 33 1968-2001 143 Curvilinear 0.0268 nests/day 0.0279 nests/day 0.0011 nests/day  
Daily failure rate (chicks) 33 1968-2001 113 None        
Laying date 33 1968-2001 81 None        
Percentage juveniles (CES) 17 1984-2001 97 Smoothed trend 101 productivity index 101 productivity index -1%  
Percentage juveniles (CES) 10 1991-2001 113 Smoothed trend 103 productivity index 101 productivity index -3%  
Percentage juveniles (CES) 5 1996-2001 114 Smoothed trend 101 productivity index 101 productivity index -1%  
Clutch size graph
Brood size graph
Egg nest failure graph
Chick nest failure graph
Laying date graph
CES productivity graph
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This report should be cited as:
Crick, H.Q.P., Marchant, J.H., Noble, D.G., Baillie, S.R., Balmer, D.E., Beaven, L.P., Coombes, R.H.,
Downie, I.S., Freeman, S.N., Joys, A.C., Leech, D.I., Raven, M.J., Robinson, R.A. and Thewlis, R.M. (2004)
Breeding Birds in the Wider Countryside: their conservation status 2003.
BTO Research Report No. 353. BTO, Thetford. (http://www.bto.org/birdtrends2003)

Pages maintained by Susan Waghorn and Iain Downie: Last updated 16 February, 2009