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

1. Table of alerts for WBS/WBBS waterways 1975-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 42 23 -97 -99 -94 >50  
Snipe 42 14 -88 -98 -54 >50 Small sample
Redshank 42 23 -72 -92 -46 >50  
Sedge Warbler 42 74 -67 -79 -51 >50  
Reed Bunting 42 91 -67 -76 -55 >50  
Pied Wagtail 42 121 -66 -76 -56 >50  
Little Grebe 42 20 -55 -80 -7 >50  
Common Sandpiper 42 51 -48 -62 -34 >25  
Grey Wagtail 42 102 -40 -53 -21 >25  
Moorhen 42 128 -35 -50 -14 >25  

2. Table of alerts for WBS/WBBS waterways 1992-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 25 21 -92 -96 -84 >50  
Redshank 25 25 -70 -83 -54 >50  
Lapwing 25 84 -59 -70 -44 >50  
Sedge Warbler 25 99 -57 -69 -41 >50  
Common Sandpiper 25 67 -41 -52 -28 >25  
Pied Wagtail 25 157 -38 -50 -26 >25  
Coot 25 82 -36 -58 -8 >25  
Curlew 25 60 -35 -55 -4 >25  

3. Table of alerts for WBS/WBBS waterways 2007-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 10 16 -52 -74 -15 >50 Small sample
Tufted Duck 10 48 -51 -63 -34 >50  
Sedge Warbler 10 99 -43 -55 -28 >25  
Coot 10 77 -42 -55 -27 >25  
Lapwing 10 84 -38 -54 -18 >25  
Redshank 10 22 -33 -53 -11 >25  
Little Grebe 10 18 -29 -43 -7 >25 Small sample
Moorhen 10 163 -26 -33 -19 >25  

4. Table of alerts for WBS/WBBS waterways 2012-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Tufted Duck 5 46 -40 -52 -21 >25  
Sedge Warbler 5 96 -38 -53 -19 >25  
Coot 5 72 -31 -41 -21 >25  

5. Table of population increases for WBS/WBBS waterways 1975-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Mute Swan 42 86 65 7 139    
Mallard 42 178 169 105 236    

 

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. (2019) BirdTrends 2019: trends in numbers, breeding success and survival for UK breeding birds. BTO Research Report 722. BTO, Thetford. www.bto.org/birdtrends