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
Lee is responsible for running the Constant Effort Sites (CES), Retrapping Adults for Survival (RAS) ringing projects and the Nest Record Scheme (NRS), as well as providing all round ringing support. Training in these aspects is also covered by his role in the Ringing and Nest Recording Team.
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
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
Ruth leads on communication for the Ringing and Nest Recording Team, is the lead editor for LifeCycle, the BTO magazine for ringers and nest recorders, 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.