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CBC/BBS alerts & population increases

1a.   CBC/BBS UK alerts – long term
1b.   CBC/BBS England alerts – long term
2a.   CBC/BBS UK alerts – 25 years
2b.   CBC/BBS England alerts – 25 years
3a.   CBC/BBS UK alerts – 10 years
3b.   CBC/BBS England alerts – 10 years
4a.   CBC/BBS UK alerts – 5 years
4b.   CBC/BBS England alerts – 5 years
5a.   CBC/BBS UK population increases of >50% – long term
5b.   CBC/BBS England population increases of >50% – long term

1a. Table of population alerts for CBC/BBS UK 1967-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Turtle Dove 50 98 -98 -99 -96 >50  
Willow Tit 50 42 -93 -97 -86 >50  
Grey Partridge 50 142 -92 -95 -89 >50  
Spotted Flycatcher 50 134 -89 -92 -83 >50  
Corn Bunting 50 83 -86 -93 -73 >50  
Marsh Tit 50 106 -80 -85 -72 >50  
Yellow Wagtail 50 94 -74 -86 -46 >50  
Little Owl 50 61 -72 -82 -54 >50  
Whitethroat 50 755 -63 -72 -48 >50  
Greenfinch 50 930 -61 -70 -51 >50  
Yellowhammer 50 656 -59 -66 -50 >50  
Mistle Thrush 50 646 -55 -62 -48 >50  
Lapwing 50 354 -54 -74 -26 >50  
Song Thrush 50 1126 -48 -57 -39 >25  
Sedge Warbler 50 173 -37 -67 -7 >25  
Bullfinch 50 400 -36 -51 -20 >25  
Dunnock 50 1158 -34 -43 -25 >25  
Garden Warbler 50 269 -29 -53 -1 >25  

1b. Table of population alerts for CBC/BBS England 1967-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Turtle Dove 50 97 -98 -99 -96 >50  
Tree Sparrow 50 107 -96 -98 -91 >50  
Nightingale 50 24 -94 -98 -68 >50  
Spotted Flycatcher 50 99 -93 -96 -90 >50  
Willow Tit 50 38 -93 -97 -89 >50  
Grey Partridge 50 127 -92 -95 -89 >50  
Starling 50 746 -89 -92 -86 >50  
Tree Pipit 50 53 -88 -95 -76 >50  
Lesser Redpoll 50 52 -87 -96 -72 >50  
Corn Bunting 50 79 -85 -93 -73 >50  
Marsh Tit 50 97 -78 -84 -68 >50  
Cuckoo 50 311 -77 -83 -69 >50  
House Martin 50 359 -72 -91 -14 >50  
Yellow Wagtail 50 92 -72 -88 -38 >50  
Linnet 50 547 -70 -76 -61 >50  
Little Owl 50 59 -68 -82 -45 >50  
Willow Warbler 50 546 -66 -76 -56 >50  
Skylark 50 742 -63 -70 -57 >50  
Whitethroat 50 650 -63 -74 -51 >50  
Yellowhammer 50 570 -63 -72 -53 >50  
Mistle Thrush 50 517 -62 -68 -53 >50  
Greenfinch 50 789 -56 -67 -44 >50  
Meadow Pipit 50 230 -50 -78 -25 >25  
Song Thrush 50 889 -49 -56 -40 >25  
Sedge Warbler 50 114 -46 -72 -19 >25  
Lapwing 50 298 -39 -69 -13 >25  
Bullfinch 50 319 -38 -52 -21 >25  
Dunnock 50 949 -37 -47 -27 >25  

2a. Table of population alerts for CBC/BBS UK 1992-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Turtle Dove 25 129 -95 -97 -93 >50  
Willow Tit 25 48 -87 -91 -81 >50  
Grey Partridge 25 217 -67 -73 -58 >50  
Little Owl 25 94 -58 -67 -46 >50  
Greenfinch 25 1715 -57 -62 -53 >50  
Spotted Flycatcher 25 189 -55 -66 -40 >50  
Marsh Tit 25 155 -51 -60 -40 >50  
Yellow Wagtail 25 157 -50 -66 -38 >25  
Corn Bunting 25 139 -43 -57 -21 >25  
Lapwing 25 649 -38 -47 -26 >25  
Mistle Thrush 25 1145 -36 -41 -29 >25  
Yellowhammer 25 1171 -35 -39 -29 >25  
Tawny Owl 25 108 -31 -45 -14 >25  

2b. Table of population alerts for CBC/BBS England 1992-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Turtle Dove 25 127 -95 -97 -93 >50  
Willow Tit 25 43 -89 -92 -84 >50  
Spotted Flycatcher 25 133 -73 -79 -65 >50  
Tree Pipit 25 74 -72 -83 -55 >50  
Cuckoo 25 523 -71 -75 -67 >50  
Starling 25 1378 -71 -74 -68 >50  
Nightingale 25 34 -67 -79 -46 >50  
Grey Partridge 25 195 -64 -72 -56 >50  
Lesser Redpoll 25 65 -63 -89 -31 >50  
Little Owl 25 92 -55 -66 -42 >50  
Greenfinch 25 1451 -54 -58 -48 >50  
Yellow Wagtail 25 154 -49 -68 -37 >25  
Mistle Thrush 25 907 -47 -52 -40 >25  
Marsh Tit 25 142 -47 -57 -35 >25  
Corn Bunting 25 132 -43 -59 -22 >25  
Willow Warbler 25 928 -42 -50 -35 >25  
Yellowhammer 25 1017 -42 -48 -38 >25  
House Martin 25 698 -39 -57 -19 >25  
Meadow Pipit 25 425 -36 -50 -22 >25  
Sparrowhawk 25 290 -32 -40 -21 >25  
Skylark 25 1374 -28 -33 -22 >25  
Tawny Owl 25 93 -26 -40 -10 >25  
Garden Warbler 25 374 -26 -35 -13 >25  

3a. Table of population alerts for CBC/BBS UK 2007-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Turtle Dove 10 70 -83 -89 -77 >50  
Greenfinch 10 2105 -67 -68 -65 >50  
Willow Tit 10 38 -46 -60 -32 >25  
Little Owl 10 88 -43 -52 -33 >25  
Grey Partridge 10 221 -36 -44 -27 >25  
Lapwing 10 783 -33 -40 -26 >25  
Marsh Tit 10 164 -31 -40 -22 >25  
Moorhen 10 769 -29 -32 -24 >25  

3b. Table of population alerts for CBC/BBS England 2007-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Turtle Dove 10 68 -83 -89 -76 >50  
Greenfinch 10 1786 -65 -66 -63 >50  
Willow Tit 10 33 -52 -64 -40 >50  
Little Owl 10 86 -44 -53 -33 >25  
Spotted Flycatcher 10 119 -39 -49 -28 >25  
Grey Partridge 10 198 -37 -45 -29 >25  
Starling 10 1636 -35 -39 -31 >25  
Cuckoo 10 488 -32 -39 -27 >25  
House Martin 10 851 -32 -37 -26 >25  
Lapwing 10 673 -30 -36 -24 >25  
Chaffinch 10 2574 -30 -31 -28 >25  
Sparrowhawk 10 339 -29 -34 -22 >25  
Moorhen 10 714 -28 -32 -23 >25  
Tree Pipit 10 84 -27 -43 -7 >25  

4a. Table of population alerts for CBC/BBS UK 2012-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Turtle Dove 5 38 -51 -67 -35 >50  
Greenfinch 5 1969 -47 -49 -44 >25  

4b. Table of population alerts for CBC/BBS England 2012-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Turtle Dove 5 37 -50 -67 -33 >25  
Greenfinch 5 1676 -45 -47 -42 >25  
Nightingale 5 39 -36 -52 -25 >25  
Willow Tit 5 26 -29 -45 -7 >25  
Swallow 5 2041 -27 -29 -23 >25  

5a. Table of population increases of >50% for UK CBC/BBS 1967-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Robin 50 1318 52 39 69    
Pied Wagtail 50 673 57 17 124    
Great Tit 50 1226 90 65 115    
Magpie 50 1036 98 62 152    
Reed Warbler 50 79 99 31 334    
Chiffchaff 50 871 110 73 170    
Wren 50 1358 117 88 145    
Jackdaw 50 919 130 56 222    
Coot 50 151 142 43 427    
Mallard 50 718 154 93 220    
Woodpigeon 50 1296 162 33 442    
Nuthatch 50 301 268 185 441    
Mute Swan 50 137 270 71 845    
Blackcap 50 921 297 231 393    
Great Spotted Woodpecker 50 607 387 275 646    

5b. Table of population increases of >50% for England CBC/BBS 1967-2017


Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Pied Wagtail 50 511 58 25 128    
Robin 50 1050 65 47 83    
Reed Warbler 50 75 76 9 250    
Great Tit 50 1000 80 57 107    
Pheasant 50 833 94 52 166    
Long-tailed Tit 50 502 96 36 177    
Magpie 50 872 108 69 165    
Chiffchaff 50 735 115 78 181    
Wren 50 1072 116 90 146    
Jackdaw 50 740 129 55 287    
Goldfinch 50 750 131 70 198    
Carrion Crow 50 1056 137 89 178   Includes Hooded Crow
Coot 50 137 143 42 464    
Green Woodpecker 50 423 162 87 263    
Woodpigeon 50 1036 178 52 527    
Mallard 50 603 180 112 248    
Stock Dove 50 416 237 135 413    
Mute Swan 50 118 252 69 640    
Blackcap 50 788 255 185 349    
Nuthatch 50 260 280 179 439    
Great Spotted Woodpecker 50 530 325 202 547    
Buzzard 50 374 850 540 3013    

 

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