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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 1975-2016

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 41 23 -97 -99 -93 >50  
Snipe 41 14 -88 -98 -61 >50 Small sample
Redshank 41 23 -69 -93 -43 >50  
Reed Bunting 41 90 -65 -75 -49 >50  
Pied Wagtail 41 120 -62 -73 -51 >50  
Sedge Warbler 41 74 -60 -72 -43 >50  
Common Sandpiper 41 51 -47 -62 -34 >25  
Grey Wagtail 41 101 -36 -52 -19 >25  
Moorhen 41 127 -32 -48 -14 >25  

2. Table of alerts for WBS/WBBS waterways 1991-2016

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 25 21 -92 -97 -85 >50  
Snipe 25 17 -73 -97 -37 >50 Small sample
Redshank 25 26 -68 -81 -52 >50  
Lapwing 25 83 -59 -72 -44 >50  
Sedge Warbler 25 97 -51 -62 -37 >50  
Common Sandpiper 25 66 -42 -52 -30 >25  
Curlew 25 59 -33 -55 -5 >25  
Pied Wagtail 25 153 -31 -45 -15 >25  

3. Table of alerts for WBS/WBBS waterways 2006-2016

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 10 17 -51 -74 -3 >50 Small sample
Tufted Duck 10 50 -42 -56 -26 >25  
Lapwing 10 89 -39 -56 -23 >25  
Coot 10 81 -35 -53 -19 >25  
Redshank 10 24 -35 -55 -11 >25  
Sedge Warbler 10 102 -33 -44 -20 >25  

4. Table of alerts for WBS/WBBS waterways 2011-2016

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Sedge Warbler 5 98 -34 -45 -18 >25  
Tufted Duck 5 46 -32 -49 -17 >25  
Coot 5 71 -29 -40 -18 >25  

5. Table of population increases for WBS/WBBS waterways 1975-2016

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Oystercatcher 41 52 51 13 157    
Mute Swan 41 85 58 7 125    
Mallard 41 176 178 110 249    

 

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. (2018) BirdTrends 2018: trends in numbers, breeding success and survival for UK breeding birds. Research Report 708. BTO, Thetford. www.bto.org/birdtrends