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 1975-2015

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 40 23 -97 -99 -95 >50  
Snipe 40 14 -89 -98 -65 >50 Small sample
Redshank 40 24 -65 -89 -36 >50  
Reed Bunting 40 89 -63 -74 -48 >50  
Pied Wagtail 40 118 -61 -71 -54 >50  
Little Grebe 40 20 -58 -82 -11 >50  
Sedge Warbler 40 73 -54 -68 -36 >50  
Common Sandpiper 40 50 -46 -57 -34 >25  
Grey Wagtail 40 100 -39 -53 -22 >25  
Moorhen 40 126 -32 -50 -13 >25  

2. Table of alerts for WBS/WBBS waterways 1990-2015

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 25 21 -94 -98 -88 >50  
Snipe 25 17 -81 -96 -56 >50 Small sample
Redshank 25 26 -65 -80 -43 >50  
Lapwing 25 82 -60 -72 -43 >50  
Sedge Warbler 25 95 -49 -60 -36 >25  
Common Sandpiper 25 64 -44 -53 -32 >25  
Little Grebe 25 21 -42 -65 -6 >25  
Pied Wagtail 25 149 -31 -46 -21 >25  

3. Table of alerts for WBS/WBBS waterways 2005-2015

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 10 19 -60 -77 -30 >50 Small sample
Lapwing 10 96 -42 -57 -28 >25  
Redshank 10 26 -35 -57 -8 >25  
Tufted Duck 10 52 -32 -49 -11 >25  
Coot 10 86 -29 -46 -9 >25  
Sedge Warbler 10 105 -29 -39 -18 >25  
Oystercatcher 10 91 -26 -33 -17 >25  

4. Table of alerts for WBS/WBBS waterways 2010-2015

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Yellow Wagtail 5 15 -53 -72 -5 >50 Small sample
Sedge Warbler 5 97 -30 -38 -18 >25  
Coot 5 72 -28 -39 -15 >25  
Tufted Duck 5 47 -27 -45 -7 >25  

5. Table of population increases for WBS/WBBS waterways 1975-2015

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Mute Swan 40 84 62 13 126    
Whitethroat 40 87 145 7 354    
Mallard 40 174 181 110 254