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BTO Blueline

LESSER WHITETHROAT
Sylvia curruca

Lesser Whitethroat © Tommy Holden
Conservation listings

Europe: no SPEC category, secure
UK: Green

Long-term trend
UK, England: shallow decline
 
Status summary
Lesser Whitethroat abundance tended to be stable (albeit with short-term fluctuations) from the 1960s until the late 1980s, but there is evidence for a subsequent moderate decline in the CBC/BBS and CES trends. These changes were significant and large enough over the relevant periods to trigger BTO Alerts. Their possible causes should be investigated. A reduction in productivity, recently observed from CES plots, suggests the cause may be linked to productivity rather than to survival.
 
CBC/BBS UK graph
 
Table of population change for Lesser Whitethroat
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC/BBS UK 33 1967-2000 96 -17 -42 16    
  25 1975-2000 114 -23 -45 3    
  10 1990-2000 180 -20 -33 -7    
  5 1995-2000 250 -10 -19 1    
CBC/BBS England 33 1967-2000 92 -23 -47 22    
  25 1975-2000 109 -30 -49 -7 >25  
  10 1990-2000 172 -23 -36 -7    
  5 1995-2000 238 -12 -21 -2    
CES adults 17 1984-2001 41 -52 . . [>50*]  
  10 1991-2001 45 -57 . . [>50*]  
  5 1996-2001 39 -37 . . [>25]  
CES juveniles 17 1984-2001 44 -33 . . [>25*]  
  10 1991-2001 50 -54 . . [>50*]  
  5 1996-2001 42 -35 . . [>25*]  
BBS UK 8 1994-2002 204 -27 -38 -14 (>25)  
BBS England 8 1994-2002 194 -29 -40 -16 (>25)  
BBS acknowledgement
 
CBC/BBS England graph
CES adult abundance graph
CES juvenile abundance graph
BBS UK graph
BBS England graph
 
Table of productivity information for Lesser Whitethroat
Variable Period
(yrs)
Years Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Clutch size 33 1968-2001 6 None       Small sample
Brood size 33 1968-2001 9 None       Small sample
Daily failure rate (eggs) 33 1968-2001 8 None       Small sample
Daily failure rate (chicks) 33 1968-2001 8 None       Small sample
Laying date 33 1968-2001 9 None       Small sample
Percentage juveniles (CES) 17 1984-2001 55 Smoothed trend 85 productivity index 101 productivity index 17%  
Percentage juveniles (CES) 10 1991-2001 62 Smoothed trend 117 productivity index 101 productivity index -14%  
Percentage juveniles (CES) 5 1996-2001 54 Smoothed trend 108 productivity index 101 productivity index -7%  
 

 

Insufficient data on clutch size
available for this species

 

 

Insufficient data on brood size
available for this species

 

 

Insufficient data on nest failure
available for this species

 

 

Insufficient data on nestling failure
available for this species

 

Insufficient data on laying date
available for this species
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