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Summary tables

Tables of alerts and population increases from CBC/BBS 
Tables of alerts and population increases from WBS/WBBS 
Tables of alerts and population increases from CES 
Tables of population declines and increases from BBS 
Tables of breeding performance

Tables of alerts and population increases from CBC/BBS 
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 

Tables of alerts and population increases from WBS/WBBS 
1. WBS/WBBS alerts – 33 years 
2. WBS/WBBS alerts – 25 years 
3. WBS/WBBS alerts – 10 years 
4. WBS/WBBS alerts – 5 years 
5. WBS/WBBS population increases of >50% – 33 years 

Tables of alerts and population increases from CES 
1. CES adults alerts – 24 years 
2. CES adults alerts – 10 years 
3. CES adults alerts – 5 years 
4. CES adults population increases of >50% – 24 years 

Tables of population declines and increases from BBS 
1. BBS – UK alerts – 13 years 
2. BBS – England alerts – 13 years 
3. BBS – Scotland alerts – 13 years 
4. BBS – Wales alerts – 13 years 
5. BBS – Northern Ireland alerts – 13 years 
6. BBS – UK alerts – 10 years 
7. BBS – England alerts – 10 years 
8. BBS – Scotland alerts – 10 years 
9. BBS – Wales alerts – 10 years 
10. BBS – Northern Ireland alerts – 10 years 
11. BBS – UK alert – 5 years 
12. BBS – England alerts – 5 years 
13. BBS – Scotland alerts – 5 years 
14. BBS – Wales alerts – 5 years 
15. BBS – Northern Ireland alerts – 5 years 
16. BBS – UK population increases of >50% 
17. BBS – England population increases of >50% 
18. BBS – Scotland population increases of >50% 
19. BBS – Wales population increases of >50% 
20. BBS – Northern Ireland population increases of >50% 

Tables of breeding performance 
1. Clutch size 
2. Brood size 
3. Egg-stage nest failure rate 

 

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