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Research Reports

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BTO Research Reports are scientific papers that have been self-published by the BTO. The following is a full list of those BTO research reports which have been published. 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 copy of a report please contact researchreports [at]

More information about our Annual Service reports to JNCC 1992-2005.

770. Kirkland, M., Atkinson, P.W., Clark J.A. & Robinson, R.A. Publication Date: 2024. How effective has the management of Cockle and Mussel fisheries on The Wash estuary been in ensuring that there is sufficient food for birds?. ISBN: 978-1-912642-67-0 20pp Download Report (PDF)
766. Hereward, H.F.R., Macgregor, C.J., Gabb, O., Connell, A., Thomas, R.J., Cross, A.V. & Taylor, R.C. Publication Date: 2024. Modelling population-level impacts of wind farm collision risk on Welsh Red Kites. Download Report (PDF)
764. Newson, S.E., Allez, S.L., Coule, E.K., Guille, A.W., Henney, J.M., Higgins, L., Mclellan, G.D., Lewis, M., Simmons, M.C. & Atkinson, P.W. Publication Date: 2024. Bailiwick Bat Survey: 2023 season report. 95pp Download Report (PDF)
763. Newson, S.E. & Panter, T.L. Publication Date: 2023. Ryevitalise – Bats and ancient trees report: 2023. ISBN: 978-1-912642-59-5 49pp Download Report (PDF)
762. Hanmer, H.J. & Leech, D.I. Publication Date: 2024. Breeding periods of hedgerow-nesting birds in England. ISBN: 978-1-912642-58-8 Download Report (PDF)
760. El Haddad, H., Austin, G., Woodward, I. & Booth Jones, K. Publication Date: 2023. Analysis of wintering waterbird population trends for the Lough Neagh and Lough Beg Special Protection Area (SPA). ISBN: 978-1-912642-56-4 Download Report (PDF)
757. Noble, D.G. & Barnes, A.E. Publication Date: 2023. Development of an Upland Bird Indicator for the UK and for England. ISBN: 978-1-912642-52-6 23pp Download Report (PDF)
755. Newson, S.E., Else, R., Crymble, J., Gilbert, G., Tosh, D.G. & Booth Jones, K.A. Publication Date: 2023. Bioacoustics as a novel approach for detecting the presence of Brown Rats on seabird islands. ISBN: 978-1-912642-51-9 31pp Download Report (PDF)
754. O’Hanlon, N.J., Harris, S.J., Thaxter, C.B., Boersch-Supan, P.H., Robinson, R.A., Balmer, D.E. & Burton, N.H.K. Publication Date: 2024. Seabird population and demographic monitoring in the UK: a review and recommendations for future sampling. ISBN: 978-1-912642-49-6 Download Report (PDF)
752. Pearce-Higgins, J.W., Humphreys, E.M., Burton, N.H.K., Atkinson, P.W., Pollock, C., Clewley, G.D., Johnston, D.T., O’Hanlon, N.J., Balmer, D.E., Frost, T.M., Harris S.J. & Baker, H. Publication Date: 2023. Highly pathogenic avian influenza in wild birds in the United Kingdom in 2022: impacts, planning for future outbreaks, and conservation and research priorities.. ISBN: 978-1-912642-47-2 92pp Download Report (PDF)
750. Newson, S.E., Allez, S.L., Coule, E.K., Guille, A.W., Henney, J.M., Higgins, L., McLellan, G.D., Simmons, M.C., Sweet, E., Whitelegg, D. & Atkinson, P.W. Publication Date: 2023. Bailiwick Bat Survey 2022 Report. ISBN: 978-1-912642-45-8 90pp Download Report (PDF)
749. Newson, S.E., Harris, G.T. & Panter, T.L. Publication Date: 2022. Ryevitalise – Bats and Ancient Trees: 2022 Report. ISBN: 978-1-912642-44-1 53pp Download Report (PDF)
748. Noble, D.G. & Gillings, S. Publication Date: 2023. Production of smoothed population trends when a key year of data is missing.. ISBN: 9781912642434 12pp Download Report (PDF)
744. Clewley, G.D., Calbrade, N.A., Austin, G.E., Frost, T.M. & Burton, N.H.K. Publication Date: 2022. A review of the BTO/RSPB/JNCC Wetland Bird Survey (WeBS) Low Tide Counts scheme with recommendations for its future operation.. ISBN: 978-1-912642-35-9 52pp Download Report (PDF)
743. Newson, S.E., Allez, S.L., Coule, E.K., Gillings, S., Harper, J., Henney, J.M., Higgins, L., Simmons, M.C., Sweet, E., Whitelegg, D. & Atkinson, P.W Publication Date: 2022. Bailiwick Bat Survey: 2021 Report. ISBN: 978-1-912642-34-2 72pp Download Report (PDF)
742. Barnes, A., Noble D., Austin, G. & Atkinson, P.W. Publication Date: 2022. A review of the capacity of current avian monitoring schemes in Guernsey to assess the population status of breeding and wintering bird species.. ISBN: 978-1-912642-33-5 109pp Download Report (PDF)
741. Wilson, M.W., Fletcher, K., Ludwig, S.C. & Leech, D.I. Publication Date: 2022. Nesting dates of Moorland Birds in the English, Welsh and Scottish Uplands . ISBN: 978-1-912642-32-8 Download Report (PDF)
739. Cook, A.S.C.P. Publication Date: 2021. Additional analysis to inform SNCB recommendations regarding collision risk modelling. ISBN: 978-1-912642-30-4 Download Report (PDF)
738. Clewley, G.D., Thaxter, C.B., Humphreys, E.M., Scragg, E.S., Bowgen, K.M., Bouten, W., Masden, E.A. & Burton, N.H.K. Publication Date: 2021. Assessing movements of Lesser Black-backed Gulls using GPS tracking devices in relation to the Walney Extension and Burbo Bank Extension Offshore Wind Farms. ISBN: 978-1-912642-27-4 Download Report (PDF)
734. Booth Jones, K., Thaxter, C., Clewley, G., Wolsey, S., Calbrade, N., Atkinson, P., Calladine, J. & Burton, N. Publication Date: 2022. Belfast’s urban gulls: an assessment of breeding populations, breeding season movements and winter population. ISBN: 978-1-912642-26-7 52pp Download Report (PDF)
733. Hanmer, H.J. & Robinson, R.A. Publication Date: 2021. Incidence of road mortality in ringed raptors and owls: a spatial analysis. ISBN: 978-1-912642-24-3 40pp Download Report (PDF)
731. Booth Jones, K., O’Connell, P., Calladine, J., Noble, D., Wolsey, S., Carrington-Cotton A. & Wernham, C. Publication Date: 2021. Northern Ireland Lowland Breeding Wader Survey. ISBN: 978–1–912642–21–2 Download Report (PDF)
727. Wilson, M., Calladine, J. & Wernham, C. Publication Date: 2020. Audit of local studies of breeding Curlew and other waders in Britain and Ireland. ISBN: 978-1-912642-18-2 40pp Download Report (PDF)
725. Green, R.M.W., Burton, N.H.K. & Cook, A.S.C.P. Publication Date: 2020. Pilot Tracking Study of the Migratory Movements of Shelduck to Inform Understanding of Potential Interactions with Offshore Wind Farms in the North Sea. ISBN: 978-1-912642-19-9 54pp Download Report (PDF)
723. Jarrett, D., Calladine, J., Milner, J., Wernham C. & Wilson, M. Publication Date: 2019. Investigating wader breeding productivity in the East Cairngorms Moorland Partnership Area using collaborative methods. ISBN: 978-1-912642-11-3 36pp Download Report (PDF)
720. Border, J.A. & Gillings, S. Publication Date: 2020. Fine-scale mapping of relative abundance and trends, and extraction of small-area population trends for breeding birds. ISBN: 978-1-912642-08-3 28pp Download Report (PDF)
718. Green, R.M.W., Burton, N.H.K. & Cook, A.S.C.P. Publication Date: 2019. Review of the migratory movements of Shelduck to inform understanding of potential interactions with the offshore wind farms in the southern North Sea. ISBN: 978-1-912642-10-6 48pp Download Report (PDF)
716. Newson S.E., Berthinussen A. Publication Date: 2019. Improving our understanding of the distribution and status of bats within the Ryevitalise Landscape Partnership Scheme area. ISBN: 9781912642021 52pp £15.00 Download Report (PDF)
715. Jarrett D., Calladine J., Milner J., Wernham C., Wilson M. Publication Date: 2019. Investigating wader breeding productivity in the East Cairngorms Moorland Partnership Area using collaborative methods. ISBN: 9781912642014 44pp £15.00 Download Report (PDF)
713. Wilson M., Jarrett D., & Calladine J. Publication Date: 2018. Review of data and monitoring options for assessing the status of breeding wader populations in the Yorkshire Dales National Park. ISBN: 9781912642007 30pp £12.00 Download Report (PDF)
712. Cook, A.S.C.P., Humphreys, E.M., Robinson, R.A. & Burton, N.H.K. Publication Date: 2019. Review of the potential of seabird colony monitoring to inform monitoring programmes for consented offshore wind farm projects. ISBN: 978-1-912642-07-6 163pp Download Report (PDF)
710. Pearce-Higgins, J.W. & Robinson, R.A. (Eds) Publication Date: 2019. A world informed by science: the impact of BTO in 2012–18. Download Report (PDF)
709. Woodward, I.D., Calbrade, N.A. & Austin, G.E. Publication Date: 2018. Analysis of Wetland Bird Survey (WeBS) Data for The Humber Estuary SSSI, SAC, SPA and Ramsar site: Third appraisal - sector-level trends to winter 2016/17. ISBN: 978-1-912642-09-0 268pp Download Report (PDF)
707. Jennifer A. Border, Dario Massimino, Simon Gillings Publication Date: 2018. Potential Future Distribution & Abundance Patterns of Common Buzzards Buteo Buteo. ISBN: 978-1-908581-95-2 34pp £5.00 Download Report (PDF)
703. Jarrett, D., Calladine, J., Wernham, C., Wilson, M. Publication Date: 2017. Monitoring Breeding Waders in Wensleydale: trialling surveys carried out by farmers and gamekeepers. ISBN: 978-1-908581-85-3 £5.00 Download Report (PDF)
699. Chris B. Thaxter, Cat Horswill, Kathryn E. Ross, Graham E. Austin, Dawn E. Balmer and Niall H.K. Burton Publication Date: 2017. Urban Breeding Gull Surveys: A Survey Design Simulation. ISBN: 978-1-908581-78-5 60pp £5.00 Download Report (PDF), Download Report (PDF)
697. Graham Austin, Teresa Frost, Heidi Mellan, Dawn Balmer Publication Date: 2017. Results of the third Non-Estuarine Waterbird Survey, including Population Estimates for Key Waterbird Species. ISBN: 9781908581860 69pp £5.00 Download Report (PDF)
694. Gary D Clewley, Emily E Scragg, Chris B Thaxter, Niall H K Burton Publication Date: 2018. Assessing the habitat use of Lesser Black-backed Gulls (Larus fuscus) from the Bowland Fells SPA - ANNEX 1 - 2017 update. 15pp £2.50 Download Report (PDF)
694. Clewley, G.D., Scragg, E.S., Thaxter, C.B. & Burton, N.H.K. Publication Date: 2017. Assessing the habitat use of Lesser Black-backed Gulls (Larus fuscus) From the Bowland Fells SPA.. ISBN: 9781908581815 60pp £5.00 Download Report (PDF)
693. Chris B Thaxter, Gary Clewley, Lee Barber, Greg J Conway, Nigel A Clark, Emily S Scragg, Niall H K Burton Publication Date: 2018. Assessing habitat use of Herring Gulls in the Morecambe Bay SPA using GPS tracking devices. ISBN: 978-1-908581-82-2 77pp £10.00 Download Report (PDF)
692. Henrietta Pringle, Gavin Siriwardena and Mike Toms Publication Date: 2017. Informing best practice for mitigation and enhancement measures for Barn Owls. ISBN: 978-1-908581-72-3 34pp £10.00 Download Report (PDF)
691. Robinson, R.A., Leech D.I., Massimino, D., Woodward I., Hammond, M.J., Harris, S.J., Noble, D.G., Walker, R.H., Eglington, S.M., Marchant, J.H.Sullivan, M.J.P., & Baillie, S.R. Publication Date: 2016. Bird Trends 2016: trends in numbers, breeding success and survival for UK breeding birds.