Contents of report
Breeding Bird Survey
Common Birds Census
Constant Effort Sites
Nest Record Scheme
Waterways Bird Survey
Alerts
Summary
What the categories mean
Return to BTO Home Page
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4. Discussion
   
4.1 The new alert system
4.2 The 30-year alerts
4.3 Alerts over shorter time periods
4.4 Increasing species
4.5 Changes in breeding performance
4.6 Discussion of trends
4.7 Future Developments
4.8 Conclusion
4.9 Appendix - Summary of tables of changes in population size and breeding performance
4.10 Select your own table of population changes

 

   



The report should be cited as: Baillie, S.R., Crick, H.Q.P., Balmer, D.E., Bashford, R.I., Beaven, L.P., Freeman, S.N., Marchant, J.H., Noble, D.G., Raven, M.J., Siriwardena, G.M., Thewlis, R. and Wernham, C.V. (2001) Breeding Birds in the Wider Countryside: their conservation status 2000. BTO Research Report No. 252. BTO, Thetford. (http://www.bto.org/birdtrends)

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