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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.

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)
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. 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
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)
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.
689. Scragg E S, Thaxter C B, Clewley G D, and Burton N.H.K. Publication Date: 2017. Assessing behaviour of Lesser Black-backed Gulls from the Ribble and Alt Estuaries SPA using GPS tracking devices. ISBN: 978-1-908581-75-4 53pp £5.00 Download Report (PDF)
684. Graham E. Austin, Teresa M. Frost and Kathryn Ross Publication Date: 2017. Providing Data for Rapid Condition Assessment of Non-Breeding Waterbird SPAs in England: Phase II. ISBN: 978-1-908581-73-0 29pp £5.00 Download Report (PDF)
682. Stuart E. Newson, David J. Turvey, Samuel Neal, Simon Gillings Publication Date: 2016. Earth Observation Data Integration Pilot Project 5 - Developing community and crowd-sourced validation of 'Living Maps'. 382pp Download Report (PDF)
680. Kathryn E Ross, Niall H K Burton, Dawn E Balmer, Elizabeth M Humphreys, Graham E Austin, Beth Goddard, Helena Schindler-Dite and Mark M Rehfisch Publication Date: 2016. Urban Breeding Gull Surveys: A Review of Methods and Options for Survey Design. ISBN: 978-1-908581-70-9 58pp Download Report (PDF)
678. Robinson, R.A., Marchant, J.H., Leech, D.I., Massimino, D., Sullivan, M.J.P., Eglington, S.M., Barimore, C., Dadam, D., Downie, I.S., Hammond, M.J., Harris, S.J., Noble, D.G., Walker, R.H. & Baillie, S.R. Publication Date: 2015. Bird Trends 2015: trends in numbers, breeding success and survival for UK breeding birds.
677. B Martay, J W Pearce-Higgins, S Gillings & S R Baillie Publication Date: 2016. An assessment of the potential benefits of additional stratification of BBS squares by habitat and accessibility to enhance the monitoring of rare species and habitats. . ISBN: 978-1-908581-59-4 39pp £5.00 Download Report (PDF)
676. Alison Johnston & Aonghais, S.C.P. Cook Publication Date: 2016. How high do birds fly? Development of methods and analysis of digital aerial data of seabird flight heights . 53pp £5.00 Download Report (PDF)
671. Viola H Ross-Smith, Robert A Robinson & Jacquie A Clark Publication Date: 2015. Dispersal and movements of Lesser Black-backed Gull in Europe. ISBN: 978-1-908581-55-6 £5.00 Download Report (PDF)
670. Graham E Austin Publication Date: 2015. The use of Wetland Bird Survey (WeBS) data for rapid condition assessment of non-breeding waterbird SPAs in England. ISBN: 978-1-908581-53-2 21pp £2.50 Download Report (PDF)
669. Elizabeth M. Humphreys, Aonghais S.C.P. Cook and Niall H.K. Burton Publication Date: 2015. Collision, Displacement and Barrier - Effect Concept Note. 37pp Download Report (PDF)
667. Horswill, C., Robinson, Robert A. Publication Date: 2015. Review of seabird demographic rates and density dependence.
666. Chris B. Thaxter, Viola H. Ross-Smith & Aonghais S C P Cook Publication Date: 2016. How high do birds fly? A review of current datasets and an appraisal of current methodologies for collecting flight height data: Literature review . 66pp £5.00 Download Report (PDF)
663. Ian G. Henderson, David Noble, Rachel Taylor & Veronica Mendez Publication Date: 2015. Consultation to the Birds Directive Article 3 Birds of Conservation Concern and Delivery Mechanisms. 113pp £10.00 Download Report (PDF)
661. Graham Austin & Viola Ross-Smith Publication Date: 2014. Guidance to Interpretation of Wetland Bird Survey Within-Site Trends. ISBN: 978-1-908581-49-5 31pp £2.50 Download Report (PDF)
660. Ian D. Woodward, Viola H. Ross-Smith, Rafael Pérez-Domínguez, Mark M. Rehfisch and Graham E. Austin Publication Date: 2015. The Wash Bird Decline Investigation 2014. ISBN: 978-1-908581-52-5 113pp £10.00 Download Report (PDF)
657. Lucy J. Wright, Veronica Mendez & Niall H.K. Burton Publication Date: 2014. Review of knowledge regarding the effect of major estuarine developments on bird populations with reference to proposals for an airport in the Thames Estuary. ISBN: 978-1-908581-43-3 50pp £5.00 Download Report (PDF)
656. Cook, A.S.C.P., Humphreys, E.M., Masden, E.A., Band, W. & Burton, N.H.K. Publication Date: 2014. The avoidance rates of collision between birds and offshore turbines. Link to Report
655. Calbrade, N.A. Publication Date: 2014. WeBS Low Tide Counts on English SPAs. ISBN: 978-1-908581-44-0 49pp £5.00 Download Report (PDF)
654. Ross-Smith, V.H., Grantham, M.J., Robinson, R.A. & Clark, J.A. Publication Date: 2014. Analysis of Lesser Black-backed Gull data to inform meta-population studies. ISBN: 978-1-908581-39-6 59pp £5.00 Download Report (PDF)
653. Austin, G.E. & Burton, N.H.K. Publication Date: 2014. Notes on the WeBS-Defra Annual Cormorant Index. ISBN: 978-1-908581-45-7 18pp £2.50 Download Report (PDF)
651. Dadam, D., Leech, D.I., Clark, J.A., Robinson, R.A. & Clark, N.A. Publication Date: 2014. Towards a better understanding of predation on breeding meadowbird populations. Phase 1, Year 2: Monitoring wader nest success in relation to predation at Stanny House Farm. ISBN: 978-1-908581-38-9 49pp £5.00 Download Report (PDF)