Contents of report
Breeding Bird Survey
Common Birds Census
Constant Effort Sites
Nest Record Scheme
Waterways Bird Survey
What the categories mean
Return to BTO Home Page


Six monitoring schemes have contributed data to this report. Five provide data on changes in abundance: Common Birds Census; Waterways Bird Survey; Breeding Bird Survey; Heronries Census; and Constant Effort Sites ringing scheme. Two schemes provide data on changes in productivity: Nest Record Scheme and Constant Effort Sites. In addition, information from detailed analyses of the recoveries of 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 statistical methods used to analyse the data. Species are listed in taxonomic (Voous) order.

2.1 Common Birds Census
2.2 Waterways Bird Survey
2.3 Breeding Bird Survey
2.4 Heronries Census
2.5 Constant Effort Sites Scheme
2.6 Nest Record Scheme
2.7 The Alert System



[ Welcome | Contents | Introduction | CBC | WBS | BBS | Heronries | CES | NRS | Alerts ]
[ Summary | Discussion | References | Help | BTO Home Page ]

© 2000 British Trust for Ornithology
BTO, The Nunnery, Thetford, Norfolk IP24 2PU
Tel: (+44) (0) 1842 750050 Fax: (+44) (0) 1842 750030 Email:

Last updated: 8 March, 2001

Page created by Susan Waghorn