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.
The environmental predictors of spatio-temporal variation in the breeding phenology of a passerine bird
Warmer springs have seen many of our birds breeding earlier, but scientists still do not know how they actually decide when to start building nests and laying eggs. Do they respond directly to...
A Blue Tit diary
Hazel McCambridge walks through the diary of an average Blue Tit during the breeding season.
Spotted Flycatcher Appeal
One of our most treasured songbirds, the Spotted Flycatcher, is disappearing. Once considered a common garden nesting species, the Spotted Flycatcher is now a bird that many people are willing to...
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
Global warming has advanced the timing of biological events, potentially leading to disruption across trophic levels. The potential importance of phenological change as a driver of population trends...
Representing migration routes from re‑encounter data: a new method applied to ring recoveries of Barn Swallows (Hirundo rustica) in Europe
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.
Help monitor nests to capture vital life cycle data
The Nest Record Scheme gathers vital information on the breeding success of Britain's birds by asking volunteers to find and follow the progress of individual birds' nests.
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.
Carl is a member of the Nest Records Office, under Dr. Dave Leech, and he administers both the Nest Records Scheme and the Barn Owl Monitoring Project
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.