Species links


BirdTrends partners

British Trust for Ornithology logo
JNCC logo

Project partners

British Trust for Ornithology logo
JNCC logo
CBC/BBS alerts & population increases

1a.   CBC/BBS UK alerts – 41 years
1b.   CBC/BBS England alerts – 41 years
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% – 41 years
5b.   CBC/BBS England population increases of >50% – 41 years

 

1a. Table of population alerts for CBC/BBS UK 1967-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Grey Partridge 42 128 -91 -93 -87 >50  
Turtle Dove 42 107 -90 -95 -86 >50  
Willow Tit 42 43 -90 -96 -83 >50  
Spotted Flycatcher 42 126 -89 -93 -84 >50  
Corn Bunting 42 70 -87 -94 -76 >50  
Yellow Wagtail 42 76 -78 -89 -52 >50  
Marsh Tit 42 95 -72 -80 -62 >50  
Whitethroat 42 537 -61 -73 -49 >50  
Yellowhammer 42 511 -57 -66 -48 >50  
Little Owl 42 58 -54 -71 -25 >50  
Mistle Thrush 42 520 -52 -61 -43 >50  
Song Thrush 42 823 -50 -57 -42 >25  
Bullfinch 42 305 -45 -57 -31 >25  
Dunnock 42 846 -33 -42 -21 >25  

1b. Table of population alerts for CBC/BBS England 1967-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Tree Sparrow 42 89 -96 -98 -93 >50  
Spotted Flycatcher 42 96 -91 -94 -86 >50  
Grey Partridge 42 115 -90 -93 -87 >50  
Turtle Dove 42 106 -90 -94 -86 >50  
Willow Tit 42 40 -89 -95 -80 >50  
Lesser Redpoll 42 46 -89 -96 -74 >50  
Tree Pipit 42 47 -87 -94 -76 >50  
Starling 42 584 -87 -90 -82 >50  
Corn Bunting 42 67 -85 -92 -70 >50  
Yellow Wagtail 42 75 -77 -90 -51 >50  
Linnet 42 418 -76 -82 -70 >50  
Cuckoo 42 281 -73 -80 -62 >50  
Marsh Tit 42 87 -71 -79 -60 >50  
Skylark 42 553 -63 -69 -58 >50  
Whitethroat 42 465 -62 -72 -51 >50  
Willow Warbler 42 450 -60 -71 -49 >50  
Yellowhammer 42 446 -60 -68 -50 >50  
Mistle Thrush 42 423 -57 -65 -47 >50  
Meadow Pipit 42 173 -50 -77 -23 >25  
Song Thrush 42 652 -50 -58 -41 >50  
Little Owl 42 56 -48 -71 -3 >25  
Bullfinch 42 246 -48 -60 -36 >25  
Dunnock 42 698 -37 -47 -27 >25  
Sedge Warbler 42 93 -34 -67 -8 >25  

2a. Table of population alerts for CBC/BBS UK 1984-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Willow Tit 25 45 -87 -93 -80 >50  
Turtle Dove 25 129 -86 -91 -81 >50  
Spotted Flycatcher 25 152 -81 -87 -74 >50  
Grey Partridge 25 164 -79 -83 -71 >50  
Corn Bunting 25 96 -76 -88 -61 >50  
Yellow Wagtail 25 106 -75 -84 -64 >50  
Little Owl 25 79 -60 -72 -45 >50  
Yellowhammer 25 757 -54 -60 -48 >50  
Lapwing 25 426 -52 -62 -35 >50  
Marsh Tit 25 120 -43 -57 -27 >25  
Mistle Thrush 25 770 -42 -49 -35 >25  
Tawny Owl 25 92 -33 -47 -17 >25  

2b. Table of population alerts for CBC/BBS England 1984-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Lesser Redpoll 25 44 -93 -97 -87 >50  
Tree Pipit 25 55 -88 -93 -78 >50  
Willow Tit 25 41 -87 -92 -79 >50  
Turtle Dove 25 128 -86 -91 -81 >50  
Spotted Flycatcher 25 111 -84 -89 -78 >50  
Tree Sparrow 25 92 -81 -91 -64 >50  
Starling 25 900 -80 -83 -76 >50  
Grey Partridge 25 146 -78 -82 -69 >50  
Corn Bunting 25 92 -75 -87 -58 >50  
Yellow Wagtail 25 104 -74 -84 -61 >50  
Cuckoo 25 405 -73 -77 -67 >50  
Willow Warbler 25 642 -62 -68 -56 >50  
Yellowhammer 25 661 -58 -62 -52 >50  
Little Owl 25 76 -54 -68 -36 >50  
Mistle Thrush 25 620 -49 -55 -43 >25  
House Sparrow 25 780 -49 -61 -28 >25  
Lapwing 25 354 -46 -59 -30 >25  
Marsh Tit 25 110 -43 -56 -25 >25  
Skylark 25 849 -39 -45 -28 >25  
Meadow Pipit 25 264 -35 -56 -17 >25  
Linnet 25 616 -34 -47 -21 >25  
Tawny Owl 25 79 -29 -46 -11 >25  

3a. Table of population alerts for CBC/BBS UK 1999-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Turtle Dove 10 163 -68 -73 -62 >50  
Willow Tit 10 50 -65 -76 -56 >50  
Yellow Wagtail 10 155 -42 -52 -31 >25  
Spotted Flycatcher 10 205 -38 -52 -14 >25  
Grey Partridge 10 228 -36 -46 -27 >25  
Little Owl 10 112 -35 -46 -24 >25  

3b. Table of population alerts for CBC/BBS England 1999-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Turtle Dove 10 161 -68 -74 -62 >50  
Willow Tit 10 44 -64 -72 -53 >50  
Cuckoo 10 569 -51 -54 -47 >50  
Spotted Flycatcher 10 144 -47 -55 -37 >25  
Starling 10 1526 -44 -46 -39 >25  
Yellow Wagtail 10 151 -42 -51 -32 >25  
Tree Pipit 10 78 -36 -52 -20 >25  
Little Owl 10 109 -33 -44 -20 >25  
Mistle Thrush 10 1018 -31 -35 -27 >25  
Grey Partridge 10 206 -28 -38 -17 >25  
Willow Warbler 10 956 -27 -32 -23 >25  

4a. Table of population alerts for CBC/BBS UK 2004-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Turtle Dove 5 141 -52 -59 -46 >50  
Willow Tit 5 48 -44 -56 -29 >25  
Grey Partridge 5 245 -31 -39 -21 >25  
Yellow Wagtail 5 156 -31 -42 -20 >25  

4b. Table of population alerts for CBC/BBS England 2004-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Turtle Dove 5 140 -51 -58 -44 >50  
Willow Tit 5 43 -40 -51 -24 >25  
Cuckoo 5 570 -35 -39 -31 >25  
Spotted Flycatcher 5 139 -33 -43 -20 >25  
Yellow Wagtail 5 153 -32 -42 -20 >25  
Grey Partridge 5 222 -27 -35 -15 >25  
Tree Pipit 5 83 -27 -43 -13 >25  
Starling 5 1646 -26 -29 -20 >25  

5a. Table of population increases of >50% for UK CBC/BBS 1967-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Chiffchaff 42 575 51 22 90    
Pied Wagtail 42 498 63 24 125    
Coal Tit 42 352 68 1 190    
Wren 42 995 81 56 102    
Magpie 42 754 98 63 145    
Reed Warbler 42 61 107 15 312    
Jackdaw 42 619 107 27 246    
Great Tit 42 889 110 86 139    
Mallard 42 519 167 101 227    
Woodpigeon 42 907 170 36 592    
Blackcap 42 626 177 126 239    
Coot 42 114 199 86 555    
Nuthatch 42 203 206 111 314    
Mute Swan 42 98 234 58 625    
Great Spotted Woodpecker 42 412 403 264 693    

5b. Table of population increases of >50% for England CBC/BBS 1967-2009

Species Period
(yrs)
Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Goldfinch 42 486 55 21 108    
Robin 42 771 56 40 74    
Chiffchaff 42 490 57 30 107    
Pied Wagtail 42 384 63 18 135    
Wren 42 789 80 56 103    
Reed Warbler 42 58 81 17 230    
Pheasant 42 592 90 50 170    
Jackdaw 42 494 93 26 227    
Great Tit 42 731 101 74 132    
Magpie 42 640 104 62 165    
Long-tailed Tit 42 362 117 60 191    
Carrion Crow 42 758 119 76 175   Includes Hooded Crow
Blackcap 42 546 158 109 211    
Stock Dove 42 294 166 99 302    
Woodpigeon 42 728 191 62 589    
Coot 42 103 196 88 586    
Mute Swan 42 85 199 36 484    
Mallard 42 438 209 137 304    
Green Woodpecker 42 310 214 132 341    
Nuthatch 42 174 220 141 359    
Great Spotted Woodpecker 42 365 366 245 634    
Buzzard 42 195 652 380 2116    

 

 

This report should be cited as: Baillie, S.R., Marchant, J.H., Leech, D.I., Renwick, A.R., Eglington, S.M., Joys, A.C., Noble, D.G., Barimore, C., Conway, G.J., Downie, I.S., Risely, K. & Robinson, R.A. (2012) BirdTrends 2011. BTO Research Report No. 609. BTO, Thetford. http://www.bto.org/birdtrends