Monitoring

Fieldworker surveying (Peter M Wilson)

Fieldworker surveying (Peter M Wilson)

Monitoring has been the cornerstone of science at the BTO since its inception more than 70 years ago, encompassing a range of volunteer and professional-oriented annual and periodic surveys, breeding and wintering bird atlases, garden bird surveys, online bird recording as well as special species or habitat-focused surveys. Much of this is achieved through a unique partnership between staff scientists and a large network of skilled volunteers who undertake a comprehensive array of carefully designed surveys that deliver annual information on most of Britain’s breeding and wintering birds.

The largest recent project was the 2007-11 Bird Atlas, which aimed to determine the breeding and wintering ranges of all British species comprehensively at the 10-km scale, for comparison with the previous three atlases organised by BTO. Garden BirdWatch, involving more than 15,000 volunteers that record weekly numbers of common wildlife species is the largest survey. Outside gardens, BTO organises two of the largest annual surveys of birds in the UK. These are the BTO/JNCC/RSPB Breeding Bird Survey in which volunteers provide counts of all terrestrial bird species on more than 3200 randomly-selected squares, and the BTO/JNCC/RSPB Wetland Bird Survey in which volunteers count most of the UK’s wintering waterbirds on key wetland and coastal sites. These are complemented by a suite of special surveys targeted at riparian birds (Waterways Breeding Bird Survey), herons and egrets (the Heronries Census) and periodic national surveys of species as diverse as Barn Owl, Nightingale and Peregrine. Together with information from surveys related to the demographics of bird populations (Nest Record Scheme, Ringing schemes), annual censuses provide a way of assessing whether effects during the breeding season (e.g. through reduced productivity) or over winter (e.g. through changes in survival) are driving the observed changes in numbers.

The BTO promotes good practice in monitoring and continues to develop its field recording protocols, its use of new technologies including remote sensing devices and online data capture, survey sampling designs, and new analytical methodologies. Expertise is shared with collaborators involved in the monitoring of non-avian taxa, and with bird monitoring initiatives across Europe. BTO monitoring methods have also been adapted to address a range of issues in the UK, including assessing the impact of agricultural, upland or forest land use policies, climate change and other potential drivers of environmental change.

For further information on monitoring at the BTO, please contact David Noble or Andy Musgrove

Recent research on Monitoring

Cuckoo - Edmund Fellowes

Cuckoos: England’s loss is Scotland’s gain

The Cuckoo is quickly declining from the English countryside, but this new study using BTO data shows that despite its decline in the south of the UK, it is increasing in the Scottish Highlands, the population is increasing.
Nightingale - John Spaull

Counting songs: estimating the UK’s Nightingale population

A new study led by BTO estimates the UK Nightingale population at 5095 – 5983 territorial males. The study also highlights the importance of Lodge Hill SSSI as important sites and discusses the use of appropriate methodology when estimating populations for scarcer species.
Bird ringing by David Tipling

Estimating mortality of birds caught for ringing with mist nets

The benefit of the information accrued when capturing wild animals for study needs to outweigh the potential risk to individuals that are caught. New BTO research, just published, assesses the potential effects of capturing wild birds.