BTO Research Reports are scientific papers that have been self-published by the BTO. The following is a full list of the published BTO research reports. Most are free to download, and links to Abstracts are included where possible.
Numbers missing from the list are those allocated but which were never produced or which have not been published. BTO recognises that, particularly in respect of commercially sensitive cases, a period of confidentiality is appropriate for some projects. However, in the interests of scientific development and dissemination of information, we encourage clients to permit publication as soon as it is reasonable to do so.
- If you wish to purchase a physical copy of a report please contact [email protected].
- More information about our Annual Service reports to JNCC 1992-2005.
Assessment of recent Hen Harrier population trends in England through population modelling
This study uses a population modelling approach to explore the effects of changes in rates of productivity, survival, and settlement on population growth in the English population of Hen Harriers.
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Assessment of recent Hen Harrier population trends in England through population modelling
Author: Macgregor, C.J., Pearce-Higgins, J.W., Siriwardena, G.M., Wilson, M.W. & Robinson, R.A.
Published: 2025
This study uses a population modelling approach to explore the effects of changes in rates of productivity, survival, and settlement on population growth in the English population of Hen Harriers.
14.03.25
Research reports Research reports
Bat distribution and activity in the Skell Valley catchment, 2024 Report
Author: Newson, S.E. & Crisp, G.
Published: 2025
This report presents the main findings from survey work delivered using passive acoustic monitoring devices deployed across the Skell Valley catchment. Through the surveys that we support we aim to improve knowledge and understanding of species distribution and activity, covering a range of taxonomic groups, including birds, bats, small terrestrial mammals and insects. Through the approach we provide robust datasets that can be used to inform better decision-making processes.
07.03.25
Research reports Research reports
Farming in Project Landscapes – Turtle Dove Monitoring Project, 2024 Report
Author: Ashton-Butt, A., Gillings, S., Thurston, L., Wells, F., Wetherhill, A. & Newson, S.E.
Published: 2025
This report presents the results of work using static acoustic recorders, deployed between May and mid-August 2024, to provide extensive acoustic data for the Stour Valley Farmer Cluster.
04.03.25
Research reports Research reports
Ryevitalise – Bats and Ancient Trees, 2020–2024 Report
Author: Newson, S.E. & Panter, T.L.
Published: 2025
Working with a network of volunteers, static acoustic bat detectors were deployed over five survey seasons, 2020-2024, to provide bat data for the Ryevitalise Landscape Partnership Scheme area of the North York Moors National Park. This report provides an overview of the survey coverage and results from the project.
04.03.25
Research reports Research reports
Seabird Population Trends and Causes of Change: 1986–2023
Author: Harris, S.J., Baker, H., Balmer, D.E., Bolton, M., Burton, N.H.K., Caulfield, E., Clarke, J.A.E., Dunn, T.E., Evans, T.J., Hereward, H.R.F., Humphreys, E.M., Money, S. and O’Hanlon, N.J.
Published: 2024
This report presents the latest seabird population trends in breeding abundance and productivity using data from the Seabird Monitoring Programme (SMP).The report documents changes in the abundance and productivity of breeding seabird species in Britain and Ireland from 1986 to 2023, and provides a detailed account of the 2021, 2022 and 2023 breeding seasons.This report includes both inland and coastal populations and trends from the Channel Islands, England, Isle of Man, Northern Ireland, Scotland, Wales and the Republic of Ireland, which are presented where sufficient data are available. The results from this report are used more broadly to assess the health of the wider environment, to inform policy and for conservation action.
21.11.24
Research reports Research reports
