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BBWC Home > Contents > Appendix > Tables of alerts and population increases from CBC/BBS
   
7.1 Tables of alerts and population increases from CBC/BBS
   
1a. CBC/BBS UK alerts - 35 years
1b. CBC/BBS England alerts - 35 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% - 35 years
5b CBC/BBS England population increases of >50% - 35 years
 
5a. Table of population increases of >50% for UK CBC/BBS 1967-2002
Species Period
(yrs)		 Plots
(n)		 Change
(%)		 Lower
limit		 Upper
limit		 Alert Comment
Great Tit 35 555 71 48 94    
Jackdaw 35 344 73 21 154    
Reed Warbler 35 43 89 27 260    
Pied Wagtail 35 300 97 48 170    
Wren 35 622 99 69 124    
Magpie 35 472 108 68 150    
Blackcap 35 391 121 79 191    
Woodpigeon 35 514 126 18 398    
Nuthatch 35 129 126 68 230    
Mallard 35 320 188 116 255    
Coot 35 73 230 127 692    
Great Spotted Woodpecker 35 230 230 146 446    
Mute Swan 35 59 247 49 646    
Buzzard 35 131 407 240 1287    
5b. Table of population increases of >50% for England CBC/BBS 1967-2002
Species Period
(yrs)		 Plots
(n)		 Change
(%)		 Lower
limit		 Upper
limit		 Alert Comment
Jackdaw 35 274 63 13 173    
Reed Warbler 35 41 64 10 254    
Great Tit 35 463 66 44 92    
Pheasant 35 348 74 37 154    
Long-tailed Tit 35 238 79 25 152    
Wren 35 501 98 68 129    
Pied Wagtail 35 233 104 49 206    
Blackcap 35 347 110 72 156    
Carrion Crow 35 458 110 76 168   Includes Hooded Crow
Magpie 35 405 111 67 166    
Nuthatch 35 112 124 62 224    
Woodpigeon 35 415 137 17 399    
Stock Dove 35 191 188 105 385    
Green Woodpecker 35 188 188 119 292    
Mute Swan 35 50 201 32 571    
Mallard 35 270 210 142 283    
Great Spotted Woodpecker 35 208 227 141 399    
Coot 35 66 232 119 639    
Buzzard 35 75 352 203 977    
 
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This report should be cited as:
Baillie, S.R., Marchant, J.H., Crick, H.Q.P., Noble, D.G., Balmer, D.E., Beaven, L.P., Coombes, R.H.,
Downie, I.S., Freeman, S.N., Joys, A.C., Leech, D.I., Raven, M.J., Robinson, R.A. and Thewlis, R.M. (2005)
Breeding Birds in the Wider Countryside: their conservation status 2004.
BTO Research Report No. 385. BTO, Thetford. (http://www.bto.org/birdtrends)

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