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 1975-2020 |
| Species | Period (yrs) |
Plots (n) |
Change (%) |
Lower limit |
Upper limit |
Alert | Comment |
|---|---|---|---|---|---|---|---|
| Yellow Wagtail | 45 | 21 | -96 | -99 | -93 | >50 | |
| Snipe | 45 | 14 | -89 | -99 | -44 | >50 | Small sample |
| Redshank | 45 | 22 | -76 | -94 | -53 | >50 | |
| Pied Wagtail | 45 | 117 | -70 | -79 | -62 | >50 | |
| Reed Bunting | 45 | 88 | -66 | -75 | -53 | >50 | |
| Sedge Warbler | 45 | 72 | -63 | -74 | -48 | >50 | |
| Little Grebe | 45 | 19 | -57 | -81 | -4 | >50 | Small sample |
| Common Sandpiper | 45 | 50 | -53 | -67 | -40 | >50 | |
| Grey Wagtail | 45 | 100 | -40 | -54 | -22 | >25 | |
| Moorhen | 45 | 124 | -34 | -50 | -12 | >25 | |
| Dipper | 45 | 68 | -33 | -51 | -10 | >25 |
| 2. Table of alerts for WBS/WBBS waterways 1995-2020 |
| Species | Period (yrs) |
Plots (n) |
Change (%) |
Lower limit |
Upper limit |
Alert | Comment |
|---|---|---|---|---|---|---|---|
| Yellow Wagtail | 25 | 18 | -87 | -94 | -75 | >50 | Small sample |
| Redshank | 25 | 24 | -72 | -88 | -55 | >50 | |
| Lapwing | 25 | 81 | -64 | -75 | -51 | >50 | |
| Sedge Warbler | 25 | 96 | -55 | -65 | -39 | >50 | |
| Pied Wagtail | 25 | 154 | -45 | -57 | -33 | >25 | |
| Curlew | 25 | 59 | -44 | -62 | -18 | >25 | |
| Common Sandpiper | 25 | 66 | -42 | -53 | -28 | >25 | |
| Coot | 25 | 78 | -40 | -62 | -14 | >25 | |
| Oystercatcher | 25 | 76 | -37 | -50 | -19 | >25 |
| 3. Table of alerts for WBS/WBBS waterways 2010-2020 |
| Species | Period (yrs) |
Plots (n) |
Change (%) |
Lower limit |
Upper limit |
Alert | Comment |
|---|---|---|---|---|---|---|---|
| Tufted Duck | 10 | 42 | -52 | -69 | -26 | >50 | |
| Coot | 10 | 66 | -44 | -57 | -31 | >25 | |
| Sedge Warbler | 10 | 88 | -40 | -51 | -23 | >25 | |
| Lapwing | 10 | 68 | -31 | -53 | -9 | >25 |
| 4. Table of alerts for WBS/WBBS waterways 2015-2020 |
| Species | Period (yrs) |
Plots (n) |
Change (%) |
Lower limit |
Upper limit |
Alert | Comment |
|---|---|---|---|---|---|---|---|
| Redshank | 5 | 14 | -36 | -64 | -10 | >25 | Small sample |
| Tufted Duck | 5 | 36 | -33 | -53 | -2 | >25 | |
| Lapwing | 5 | 57 | -26 | -40 | -10 | >25 |
This report should be cited as: Massimino, D., Woodward, I.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
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