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.
Avoiding tunnel vision during a PhD
Sophie Bennett reflects on her recent three month placement at the BTO and the value of taking a step back from a PhD.
Breeding ground temperature rises, more than habitat change, are associated with spatially variable population trends in two species of migratory bird
Utilising more data for better biodiversity assessments
From volunteer surveys to environmental DNA, how can we integrate the many different types of data to better understand birds?
BTO travels to Europe!
BTO travels to key conferences in Europe to share research and experience with colleagues from around the globe.
Using bird ringing data to help target conservation management
Amidst widespread declines, how can we ensure conservation is targeted and effective? Analysis of ringing data may be key to answering this question.
Warming temperatures drive at least half of the magnitude of long-term trait changes in European birds
Climate change is impacting wild populations, but its relative importance compared to other causes of change is still unclear. Many studies assume that changes in traits primarily reflect effects of...
Birds of Conservation Concern
Commonly referred to as the UK Red List for birds, the status of birds has now been reviewed five times, Covering the UK, Channel Islands and Isle of Man. The latest review was published in...
Assessing drivers of winter abundance change in Eurasian Curlews Numenius arquata in England and Wales
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 17.01.2022).
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...