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2. METHODOLOGY

Seven monitoring schemes have contributed data to this report. Six provide data on changes in abundance: these are the Breeding Bird Survey, Common Birds Census, Waterways Breeding Bird Survey, 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 retrappings and recoveries of ringed birds, from the Ringing Scheme, and on waterbirds from the Wetland Bird Survey, 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. Most of the analyses and the preparation of tables and graphs were undertaken using SAS software (SAS 2009, 2010).

2.1 Breeding Bird Survey
2.2 Common Birds Census
2.3 Combined CBC/BBS trends
2.4 Waterways Bird Survey and Waterways Breeding 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., Renwick, A.R., Joys, A.C., Noble, D.G., Barimore, C., Conway, G.J., Downie, I.S., Risely, K. & Robinson, R.A. (2010). Breeding Birds in the Wider Countryside: their conservation status 2010. BTO Research Report No. 565. BTO, Thetford. (http://www.bto.org/birdtrends)

Pages maintained by Iain Downie, Mandy T Andrews and Laura Smith: Last updated 19.11.2010