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 1975-2018 |
| 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 |
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
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