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BBWC Home > Contents > Appendix > Tables of alerts and population increases from WBS
   
7.2 Tables of alerts and population increases from WBS
   
1. WBS alerts – 31 years
2. WBS alerts – 25 years
3. WBS alerts – 10 years
4. WBS alerts – 5 years
5. WBS population increases of >50% – 31 years
1. Table of alerts for WBS waterways 1975-2006

Species Period
(yrs)		 Plots
(n)		 Change
(%)		 Lower
limit		 Upper
limit		 Alert Comment
Yellow Wagtail 31 18 -97 -99 -93 >50 Small sample
Reed Bunting 31 51 -61 -75 -33 >50  
Little Grebe 31 16 -59 -87 -9 >50 Small sample
Pied Wagtail 31 64 -53 -66 -43 >50  
Redshank 31 17 -49 -85 -16 >25 Small sample

2. Table of alerts for WBS waterways 1981-2006

Species Period
(yrs)		 Plots
(n)		 Change
(%)		 Lower
limit		 Upper
limit		 Alert Comment
Yellow Wagtail 25 16 -97 -99 -95 >50 Small sample
Little Grebe 25 15 -64 -87 -23 >50 Small sample
Redshank 25 17 -45 -76 -22 >25 Small sample
Pied Wagtail 25 64 -39 -53 -25 >25  
Common Sandpiper 25 26 -28 -44 -10 >25  

3. Table of alerts for WBS waterways 1996-2006

Species Period
(yrs)		 Plots
(n)		 Change
(%)		 Lower
limit		 Upper
limit		 Alert Comment
Sand Martin 10 22 -44 -59 -25 >25  
Redshank 10 13 -33 -51 -12 >25 Small sample

4. Table of population increases for WBS waterways 1975-2006

Species Period
(yrs)		 Plots
(n)		 Change
(%)		 Lower
limit		 Upper
limit		 Alert Comment
Oystercatcher 31 23 113 67 213    
Mallard 31 92 165 88 258    
Whitethroat 31 41 171 15 367    

 
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This report should be cited as:
Baillie, S.R., Marchant, J.H., Leech, D.I., Joys, A.C., Noble, D.G.,
Barimore, C., Grantham, M.J., Risely, K. & Robinson, R.A. (2009).
Breeding Birds in the Wider Countryside: their conservation status 2008.
BTO Research Report No. 516. BTO, Thetford. (http://www.bto.org/birdtrends)

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