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BBWC Home > Contents > Methodology


Six monitoring schemes have contributed data to this report. Five provide data on changes in abundance: these are the Breeding Bird Survey, Common Birds Census, Waterways Bird Survey, Heronries Census and Constant Effort Sites ringing scheme. Two schemes, the Nest Record Scheme and Constant Effort Sites, provide data on changes in breeding productivity. In addition, information from detailed analyses of the recoveries of ringed birds, from the Ringing Scheme, is included where relevant.

The methodologies of the monitoring schemes are described below, including information on fieldwork, data preparation, sampling considerations and the statistical methods used in analysis.

2.1 Breeding Bird Survey
2.2 Common Birds Census
2.3 Combined CBC/BBS trends
2.4 Waterways Bird Survey
2.5 Heronries Census
2.6 Constant Effort Sites Scheme
2.7 Nest Record Scheme
2.8 The alert system
2.9 Statistical methods used for alerts

Next page – Breeding Bird Survey

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This report should be cited as:
Baillie, S.R., Marchant, J.H., Leech, D.I., Joys, A.C., Noble, D.G.,
Barimore, C., Grantham, M.J., Risely, K. & Robinson, R.A. (2009).
Breeding Birds in the Wider Countryside: their conservation status 2008.
BTO Research Report No. 516. BTO, Thetford. (http://www.bto.org/birdtrends)

Pages maintained by Iain Downie, Mandy T Andrews and Laura Smith: Last updated 18.02.2009