WBS/WBBS alerts & population increases
- WBS/WBBS alerts – long term
- WBS/WBBSalerts – 25 years
- WBS/WBBS alerts – 10 years
- WBS/WBBS alerts – 5 years
- 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 |
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
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