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 researchreports@bto.org.
- 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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A review of existing methods to collect data on seabird flight height distributions and their use in offshore wind farm impact assessments
Author: Feather, A.P., Burton, N.H.K., Johnston, D.T. & Boersch-Supan, P.H.
Published: 2025
This document presents a review of existing methods for collecting seabird flight height data and their potential to produce flight height distributions that might be used in CRMs. The strengths, weaknesses, and limitations of different methods are identified and sources of measurement and sampling error, uncertainty and bias assessed. Best practice recommendations are provided for prominent methods and how data might be best utilised to inform stakeholders is considered.
15.04.25
Reports Research reports
Northern Ireland Seabird Report 2024
Author: El Haddad, H. & Upton, A.J.
Published: 2025
This report includes detailed information about the population trends and breeding success of seabirds in Northern Ireland, over the 2024 breeding season. Monitoring reports for Strangford Lough and the Outer Ards are included, as well as several additional contributor articles.
27.03.25
Reports Northern Ireland Seabird Report
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
Reports Research reports
Post-fledging movements in an elusive raptor, the Eurasian Goshawk Accipiter gentilis: scale of dispersal, foraging range and habitat interactions in lowland England
Author: Henderson, I., Barton, M., Field, A., Husbands, R., Jones, G., Armour-Chelu, N. & Conway, G.J
Published: 2025
GPS tracking of young Goshawks in lowland England reveals the movements and habitat use of this species, how these characteristics differ between the sexes, and how they change over the birds’ early lives.
14.03.25
Papers
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
Reports Research reports
