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.
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Individual Tree Pipits identified by song
Acoustic monitoring is shown to be a valuable non-intrusive method of identifying individual birds in this new research.
Long-term and large-scale multispecies dataset tracking population changes of common European breeding birds
BirdTrends 2020: Trends in numbers, breeding success and survival for UK breeding birds
The BTO's BirdTrends report is a one-stop shop for information about the population status of the common breeding birds of the wider UK countryside.
Citizen science reveals patterns in Pied Flycatcher breeding
New research uses data from BirdTrack and the Nest Record Scheme to investigate how adaptable breeding Pied Flycatchers are to a changing climate.
Carryover effects of long-distance avian migration are weaker than effects of breeding environment in a partially migratory bird
Strengthening the evidence base for temperature-mediated phenological asynchrony and its impacts
The earlier arrival of spring, measured by plants flowering, insects emerging, and the timing of egg laying and migrants arriving in birds, is one of the most obvious impacts of climate change on the...
BTO and COVID-19
BTO statement on participating in surveys during the Coronavirus pandemic (UPDATED 23.07.2021).
Survival varies seasonally in a migratory bird: linkages between breeding and non‐breeding periods
The BTO's annual BirdTrends report is a one-stop shop for information about the population status of the common breeding birds of the wider UK countryside. The report is based on data gathered by...
Nest Box Challenge becomes Nesting Neighbours
The Nest Box Challenge survey has been relaunched as Nesting Neighbours - what's changed?
Volunteering at a Bird Observatory
Louis Driver shares his experiences of volunteering at Bardsey Bird Observatory, supported by the Young Bird Observatory Volunteer programme.
Integrating dynamic environmental predictors and species occurrences: Toward true dynamic species distribution models
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...
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.
A Blue Tit diary
Hazel McCambridge walks through the diary of an average Blue Tit during the breeding season.
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 young fledging.