The population size of animals may change because of variation in the number of births or deaths, or because individuals move between populations. Understanding these "demographic rates" helps us determine why populations are changing and what actions may be effective in conserving or managing the population. BTO's Ringing and Nest Record Schemes enable us to measure the effects of changes at different points in the life cycle and so understand better the difficulties our bird populations face.
Spotted Flycatcher Appeal
Help us pinpoint why Spotted Flycatchers are dying, and address the alarming declines that we have charted over the last 50 years.
Effects of individual misidentification on estimates of survival in long-term mark–resight studies
Spatial and habitat variation in aphid, butterfly, moth and bird phenologies over the last half century
Representing migration routes from re‑encounter data: a new method applied to ring recoveries of Barn Swallows (Hirundo rustica) in Europe
Hazel provides clerical support to the Ringing and Nest Record Scheme, working on data collection, volunteer communication and licensing among other duties. She is the lead organiser of Nest Box Challenge and Norfolk Bat Survey.
Estimating age‐dependent survival from age‐aggregated ringing data—extending the use of historical records
Updating information on the period of reproduction and prenuptial migration for UK and Irish species included on Annex II of the EU Birds Directive
Monitor birds nesting in your garden
Make a record of the activities of nesting birds in your garden, from nest building through to the chicks fledging.
Bird Ringing Scheme
Bird ringing generates information on the survival, productivity and movements of birds, helping us to understand why populations are changing.
Keep an eye on Herons and egrets with the Heronries Census
Contribute to the annual survey of all Grey Herons, Little Egrets, Cormorants and scarcer herons nesting in the UK.
Ruth is responsible for running the Constant Effort Sites (CES) and Retrapping Adults for Survival (RAS) ringing projects. She is the lead editor for LifeCycle, the BTO magazine for ringers and nest recorders. Ruth also leads on wider communication for the Ringing and Nest Recording Team and is the Managing Editor of Ringing & Migration (R&M), the journal of the BTO Ringing Scheme.
Bridget manages the collection of ringing & recovery data from ringers in Britain & Ireland, and management of the ORACLE ringing/recovery database.
Dave is responsible for managing the Nest Record Scheme, the Barn Owl Monitoring Programme, and the Constant Effort Scheme and Retrapping Adults for Survival ringing projects.
Jez works in the Licensing section of the Avian Demography Team dealing with the licensing of bird ringers, and he supervises the sales and administration of rings and ringing equipment.