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WBS/WBBS alerts & population increases

1.   WBS/WBBS alerts – 33 years
2.   WBS/WBBSalerts – 25 years
3.   WBS/WBBS alerts – 10 years
4.   WBS/WBBS alerts – 5 years
5.   WBS/WBBS population increases of >50% – 33 years

 

1. Table of alerts for WBS/WBBS waterways 1975-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 34 24 -94 -98 -89 >50  
Snipe 34 13 -92 -98 -81 >50 Small sample
Redshank 34 24 -69 -90 -41 >50  
Pied Wagtail 34 110 -67 -76 -59 >50  
Reed Bunting 34 83 -58 -69 -40 >50  
Common Sandpiper 34 46 -40 -56 -27 >25  
Sedge Warbler 34 69 -37 -56 -12 >25  
Grey Wagtail 34 95 -35 -50 -15 >25  
Dipper 34 62 -32 -49 -15 >25  

2. Table of alerts for WBS/WBBS waterways 1984-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Snipe 25 14 -93 -98 -82 >50 Small sample
Yellow Wagtail 25 23 -93 -98 -88 >50  
Redshank 25 26 -68 -86 -52 >50  
Lapwing 25 73 -57 -71 -28 >50  
Pied Wagtail 25 126 -45 -55 -35 >25  
Common Sandpiper 25 54 -44 -55 -32 >25  

3. Table of alerts for WBS/WBBS waterways 1999-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 10 26 -57 -79 -25 >50  
Redshank 10 32 -51 -65 -36 >50  
Curlew 10 77 -43 -54 -31 >25  
Snipe 10 23 -40 -67 -12 >25  
Lapwing 10 113 -33 -45 -18 >25  
Pied Wagtail 10 200 -30 -37 -21 >25  

4. Table of alerts for WBS/WBBS waterways 2004-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Redshank 5 33 -47 -62 -30 >25  
Snipe 5 24 -46 -65 -18 >25  
Lapwing 5 116 -26 -33 -16 >25  
Pied Wagtail 5 211 -26 -32 -17 >25  

5. Table of population increases for WBS/WBBS waterways 1975-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Oystercatcher 34 45 73 38 179    
Coot 34 60 90 29 253    
Mute Swan 34 76 100 41 191    
Whitethroat 34 77 126 3 304    
Mallard 34 159 209 143 300    

Go to CES alerts and population increases
 

1.   WBS/WBBS alerts – 33 years
2.   WBS/WBBSalerts – 25 years
3.   WBS/WBBS alerts – 10 years
4.   WBS/WBBS alerts – 5 years
5.   WBS/WBBS population increases of >50% – 33 years

 

1. Table of alerts for WBS/WBBS waterways 1975-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 34 24 -94 -98 -89 >50  
Snipe 34 13 -92 -98 -81 >50 Small sample
Redshank 34 24 -69 -90 -41 >50  
Pied Wagtail 34 110 -67 -76 -59 >50  
Reed Bunting 34 83 -58 -69 -40 >50  
Common Sandpiper 34 46 -40 -56 -27 >25  
Sedge Warbler 34 69 -37 -56 -12 >25  
Grey Wagtail 34 95 -35 -50 -15 >25  
Dipper 34 62 -32 -49 -15 >25  

2. Table of alerts for WBS/WBBS waterways 1984-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Snipe 25 14 -93 -98 -82 >50 Small sample
Yellow Wagtail 25 23 -93 -98 -88 >50  
Redshank 25 26 -68 -86 -52 >50  
Lapwing 25 73 -57 -71 -28 >50  
Pied Wagtail 25 126 -45 -55 -35 >25  
Common Sandpiper 25 54 -44 -55 -32 >25  

3. Table of alerts for WBS/WBBS waterways 1999-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 10 26 -57 -79 -25 >50  
Redshank 10 32 -51 -65 -36 >50  
Curlew 10 77 -43 -54 -31 >25  
Snipe 10 23 -40 -67 -12 >25  
Lapwing 10 113 -33 -45 -18 >25  
Pied Wagtail 10 200 -30 -37 -21 >25  

4. Table of alerts for WBS/WBBS waterways 2004-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Redshank 5 33 -47 -62 -30 >25  
Snipe 5 24 -46 -65 -18 >25  
Lapwing 5 116 -26 -33 -16 >25  
Pied Wagtail 5 211 -26 -32 -17 >25  

5. Table of population increases for WBS/WBBS waterways 1975-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Oystercatcher 34 45 73 38 179    
Coot 34 60 90 29 253    
Mute Swan 34 76 100 41 191    
Whitethroat 34 77 126 3 304    
Mallard 34 159 209 143 300    

 

 

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