Contents of report
Breeding Bird Survey
Common Birds Census
Constant Effort Sites
Nest Record Scheme
Waterways Bird Survey
Alerts
Summary
What the categories mean
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LINNET Carduelis cannabina
 
Conservation Listings Long term trend

Table 3/Red
(>=50% Population decline)
Biodiversity Steering Group
Priority Species List

UK: Rapid decline
Farmland: Moderate decline

Woodland: Rapid decline
Scrub (CES): Rapid decline

 
Status Summary
Linnet abundance has declined rapidly in the UK, especially between the mid-1970s and mid-1980s. Subsequently, the populations monitored by the CBC have remained stable, but showing little sign of recovery. The wider populations covered by the BBS (especially in England) and the scrub birds specifically covered by the CES have shown declines continuing through the 1990s. Breeding performance fell through increased egg stage nest failure rates during the principal period of population decline, and this represents the most likely demographic mechanism (Siriwardena et al. 1999, 2000b). Over the last 30 years, failure rates at the egg stage have risen (16 days, comprising 12 days incubation + 4 days laying) from 25% to 36%, and at the chick stage (14 days) from 19% to 27%. Overall, from egg-laying to fledging, nest failures have increased from 39% to 53%. CES results data suggest that low productivity is still a problem for the species, and likely causes include reductions in hedgerow quality and therefore in nest cover from predation.
 
 
Table of population changes for Linnet
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC all habitats 30 1968-1998 123 -59 -69 -45 >50  
  25 1973-1998 124 -55 -65 -43 >50  
  10 1988-1998 105 9 -8 27    
  5 1993-1998 110 -4 -13 6    
CBC farmland 30 1968-1998 74 -50 -62 -32 >25  
  25 1973-1998 73 -47 -58 -31 >25  
  10 1988-1998 75 22 1 49    
  5 1993-1998 80 2 -10 15    
CBC woodland 30 1968-1998 21 -87 . . >50  
  25 1973-1998 21 -79 . . >50  
  10 1988-1998 18 -23 . .   Small sample
  5 1993-1998 18 -21 . .   Small sample
CES adults 14 1984-1998 21 -87 . . [>50*]  
  10 1988-1998 25 -76 . . [>50*]  
  5 1993-1998 26 -53 . . [>50*]  
CES juveniles 14 1984-1998 14 -91 . . [>50*] Small sample
  10 1988-1998 16 -81 . . [>50*] Small sample
  5 1993-1998 16 -55 . . [>50*] Small sample
BBS UK 5 1994-1999 982 -14 -20 -7    
BBS England 5 1994-1999 812 -19 -25 -13    
BBS Scotland 5 1994-1999 75 1 -24 35    
BBS Wales 5 1994-1999 68 17 -13 56    
BBS N.Ireland 5 1994-1999 21 -10 -52 71   Small sample
The Breeding Bird Survey is jointly funded by BTO, JNCC and RSPB
 
 
Table of productivity information for Linnet
Variable Period
(yrs)
Years Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Clutch size 30 1968-1998 113 None        
Brood size 30 1968-1998 127 Linear increase 4.12 chicks 4.36 chicks 0.24 chicks  
Daily failure rate (eggs) 30 1968-1998 160 Linear increase 0.0175 nests/day 0.0275 nests/day 0.01 nests/day  
Daily failure rate (chicks) 30 1968-1998 113 Linear increase 0.0146 nests/day 0.022 nests/day 0.0074 nests/day  
Laying date 30 1968-1998 117 None        
Percentage juveniles (CES) 14 1984-1998 24 Smoothed trend 230 productivity index 100 productivity index -56%[>50]  
Percentage juveniles (CES) 10 1988-1998 28 Smoothed trend 196 productivity index 100 productivity index -49%[>25*]  
Percentage juveniles (CES) 5 1993-1998 29 Smoothed trend 106 productivity index 100 productivity index -6%  
 
   

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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