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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 1975-2018

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 43 22 -97 -99 -95 >50  
Snipe 43 14 -89 -99 -49 >50 Small sample
Redshank 43 23 -70 -93 -47 >50  
Pied Wagtail 43 121 -70 -79 -62 >50  
Sedge Warbler 43 75 -68 -82 -49 >50  
Reed Bunting 43 92 -68 -77 -54 >50  
Common Sandpiper 43 52 -49 -61 -36 >25  
Grey Wagtail 43 103 -45 -58 -28 >25  
Moorhen 43 129 -35 -52 -15 >25  
Dipper 43 70 -30 -47 -1 >25  

2. Table of alerts for WBS/WBBS waterways 1993-2018

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 25 20 -92 -96 -85 >50  
Redshank 25 25 -66 -85 -45 >50  
Lapwing 25 85 -59 -71 -47 >50  
Sedge Warbler 25 100 -58 -72 -37 >50  
Pied Wagtail 25 160 -47 -59 -31 >25  
Common Sandpiper 25 69 -40 -49 -28 >25  
Coot 25 83 -37 -59 -3 >25  
Curlew 25 61 -35 -56 -5 >25  
Oystercatcher 25 77 -30 -43 -8 >25  

3. Table of alerts for WBS/WBBS waterways 2008-2018

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Tufted Duck 10 47 -56 -68 -35 >50  
Yellow Wagtail 10 14 -55 -73 -24 >50 Small sample
Sedge Warbler 10 96 -48 -62 -30 >25  
Coot 10 74 -44 -57 -29 >25  
Lapwing 10 79 -37 -56 -21 >25  

4. Table of alerts for WBS/WBBS waterways 2013-2018

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Tufted Duck 5 46 -43 -54 -23 >25  
Sedge Warbler 5 96 -34 -53 -10 >25  
Canada Goose 5 125 -26 -40 -7 >25  

5. Table of population increases for WBS/WBBS waterways 1975-2018

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Mute Swan 43 87 64 12 137    
Mallard 43 181 165 101 226    

 

This report should be cited as: Woodward, I.D., Massimino, D., Hammond, M.J., Barber, L., Barimore, C., Harris, S.J., Leech, D.I., Noble, D.G., Walker, R.H., Baillie, S.R. & Robinson, R.A. (2020) BirdTrends 2020: trends in numbers, breeding success and survival for UK breeding birds. BTO Research Report 732. BTO, Thetford. www.bto.org/birdtrends