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CES alerts & population increases

1.   CES adults alerts – 24 years
2.   CES adults alerts – 10 years
3.   CES adults alerts – 5 years
4.   CES adults population increases of >50% – 24 years 

 

1. Table of alerts for CES adults 1984-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Linnet 25 17 -94 -98 -83 >50 Small sample
Willow Warbler 25 89 -68 -75 -60 >50  
Lesser Whitethroat 25 38 -66 -82 -51 >50  
Reed Bunting 25 58 -61 -72 -49 >50  
Willow Tit 25 19 -53 -82 -9 >50 Small sample
Sedge Warbler 25 65 -40 -58 -24 >25  
Reed Warbler 25 55 -35 -49 -13 >25  
Whitethroat 25 60 -35 -52 -11 >25  

2. Table of alerts for CES adults 1999-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Willow Warbler 10 91 -44 -52 -35 >25  
Sedge Warbler 10 74 -37 -44 -30 >25  
Lesser Whitethroat 10 33 -28 -46 -10 >25  
Reed Warbler 10 62 -27 -35 -18 >25  
Greenfinch 10 50 -26 -43 -7 >25  

3. Table of alerts for CES adults 2004-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Linnet 5 15 -44 -66 -14 >25 Small sample
Lesser Whitethroat 5 33 -34 -50 -20 >25  
Greenfinch 5 52 -34 -46 -25 >25  
Sedge Warbler 5 70 -30 -36 -24 >25  
Reed Bunting 5 65 -28 -37 -18 >25  

 
4. Table of population increases for CES adults 1984-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Blackcap 25 89 55 32 89    
Chiffchaff 25 72 161 77 331    

Go to BBS population declines and increases
 

1.   CES adults alerts – 24 years
2.   CES adults alerts – 10 years
3.   CES adults alerts – 5 years
4.   CES adults population increases of >50% – 24 years 

 

1. Table of alerts for CES adults 1984-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Linnet 25 17 -94 -98 -83 >50 Small sample
Willow Warbler 25 89 -68 -75 -60 >50  
Lesser Whitethroat 25 38 -66 -82 -51 >50  
Reed Bunting 25 58 -61 -72 -49 >50  
Willow Tit 25 19 -53 -82 -9 >50 Small sample
Sedge Warbler 25 65 -40 -58 -24 >25  
Reed Warbler 25 55 -35 -49 -13 >25  
Whitethroat 25 60 -35 -52 -11 >25  

2. Table of alerts for CES adults 1999-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Willow Warbler 10 91 -44 -52 -35 >25  
Sedge Warbler 10 74 -37 -44 -30 >25  
Lesser Whitethroat 10 33 -28 -46 -10 >25  
Reed Warbler 10 62 -27 -35 -18 >25  
Greenfinch 10 50 -26 -43 -7 >25  

3. Table of alerts for CES adults 2004-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Linnet 5 15 -44 -66 -14 >25 Small sample
Lesser Whitethroat 5 33 -34 -50 -20 >25  
Greenfinch 5 52 -34 -46 -25 >25  
Sedge Warbler 5 70 -30 -36 -24 >25  
Reed Bunting 5 65 -28 -37 -18 >25  

 
4. Table of population increases for CES adults 1984-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Blackcap 25 89 55 32 89    
Chiffchaff 25 72 161 77 331    

 

 

This report should be cited as: Baillie, S.R., Marchant, J.H., Leech, D.I., Renwick, A.R., Eglington, S.M., Joys, A.C., Noble, D.G., Barimore, C., Conway, G.J., Downie, I.S., Risely, K. & Robinson, R.A. (2012) BirdTrends 2011. BTO Research Report No. 609. BTO, Thetford. http://www.bto.org/birdtrends