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CES alerts & population increases
  1. CES adults alerts – long term
  2. CES adults alerts – 25 years
  3. CES adults alerts – 10 years
  4. CES adults alerts – 5 years
  5. CES adults population increases of >50% – long term

1. Table of alerts for CES adults 1984-2016

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Willow Warbler 32 89 -74 -80 -67 >50  
Willow Tit 32 16 -68 -88 -33 >50 Small sample
Lesser Whitethroat 32 37 -66 -84 -49 >50  
Reed Bunting 32 60 -60 -72 -48 >50  
Whitethroat 32 64 -49 -63 -25 >25  
Sedge Warbler 32 67 -46 -61 -31 >25  

2. Table of alerts for CES adults 1991-2016

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Lesser Whitethroat 25 39 -70 -81 -59 >50  
Willow Warbler 25 96 -67 -72 -61 >50  
Willow Tit 25 15 -65 -88 -29 >50 Small sample
Greenfinch 25 44 -63 -81 -45 >50  
Sedge Warbler 25 75 -52 -61 -45 >50  
Reed Bunting 25 66 -46 -61 -30 >25  
Chaffinch 25 84 -42 -58 -26 >25  
Whitethroat 25 72 -40 -56 -13 >25  

3. Table of alerts for CES adults 2006-2016

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Greenfinch 10 41 -68 -76 -58 >50  
Chaffinch 10 77 -49 -57 -43 >25  
Lesser Whitethroat 10 34 -27 -43 -6 >25  

4. Table of alerts for CES adults 2011-2016

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Greenfinch 5 36 -49 -63 -36 >25  
Whitethroat 5 81 -38 -47 -29 >25  
Chaffinch 5 75 -30 -40 -23 >25  

5. Table of population increases for CES adults 1984-2016

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Goldfinch 32 35 65 8 249    
Robin 32 95 71 41 112    
Wren 32 102 87 59 128    
Blackcap 32 94 116 79 167    
Chiffchaff 32 78 338 165 681    

 

This report should be cited as: Woodward, I.D., Massimino, D., Hammond, M.J., Harris, S.J., Leech, D.I., Noble, D.G., Walker, R.H., Barimore, C., Dadam, D., Eglington, S.M., Marchant, J.H., Sullivan, M.J.P., Baillie, S.R. & Robinson, R.A. (2018) BirdTrends 2018: trends in numbers, breeding success and survival for UK breeding birds. Research Report 708. BTO, Thetford. www.bto.org/birdtrends