BTO Research Reports

BTO Research Reports

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, which includes BBS reports, Waterbirds in the UK (WeBS) reports and SMP 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.

BTO Research Report 778

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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BTO Research Report 778

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Bailiwick Bat Survey: 2021–2024 Report

Author: Newson, S.E., Allez, S.L., Coule, E.K., Guille, A.W., Harper, J., Henney, J.M., Higgins, L., Lewis, M., McLellan, G.D., Simmons, M.C., Sweet, E., Whitelegg, D. & Atkinson, P.W.

Published: 2025

Working with a network of volunteer fieldworkers, static acoustic bat detectors were deployed over four survey seasons (2021–2024) to provide baseline data for bats on the islands of Guernsey, Alderney, Herm, Sark, Brecqhou, Burhou, Crevichon, Jethou and Lihou. This report provides an overview of the survey coverage and main results from the project.

09.09.25

BTO Research Reports

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Passive acoustic monitoring on the Hepple Estate, 2024 – piloting the rewilding monitoring framework

Author: Ashton-Butt, A., Gough, M., Higgins, S.L., Wetherhill, A. & Newson, S.E

Published: 2025

This report presents results from the first year of passive acoustic monitoring as part of the pilot of the Rewilding Monitoring Framework. These data will contribute to baselining and monitoring rewilding progress on the Hepple Estate and its impact on biodiversity.

09.09.25

BTO Research Reports

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Passive acoustic monitoring with Heal Rewilding, 2024 - piloting the Rewilding Monitoring Framework.

Author: Ashton-Butt, A., Hill, D., Higgins, S.L., Wetherhill, A. & Newson, S.E.

Published: 2025

This report presents results from the first year of Passive Acoustic Monitoring with Heal Rewilding as part of the pilot of the Rewilding Monitoring Framework. These data will contribute to baselining and monitoring rewilding progress and its impact on biodiversity.

09.09.25

BTO Research Reports

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Scottish Raptor Monitoring Scheme Report 2023

Author: Peniche, G., Challis, A., Beckmann, B., Wilson, M., Eaton, M., Stevenson, A., Stirling-Aird, P., Thornton, M. & Wilkinson, N.

Published: 2025

A summary of the activities and findings of the Scottish Raptor Monitoring Scheme for the year 2023.

19.08.25

Reports Other reports

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A review of the Biological Defined Minimum Population Scale (BDMPS) approach and methodology to apportioning non-breeding season impacts on seabirds arising from offshore wind farms

Author: Johnston, D., Langlois Lopez, S., Humphreys, E. & O’Hanlon, N.

Published: 2025

Estimates of breeding seabird populations are used to assess the potential impacts of proposed wind farm developments. The approach used in these assessments is known as the Biologically Defined Minimum Population Scales (BDMPS) method, and it was developed by Furness in 2015. This report evaluates the methods developed by Furness, and highlights potential refinements to the current BDPMS approach, including methods, definitions, and data resources, to improve future ease of use and accuracy of estimates.

14.08.25

BTO Research Reports

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