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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First efforts to address bird collisions with power lines in Iran
Author: Kolnegari, M., Moghimi, E., Allahdad, M., Hazrati, M., Akbar Basiri, A., Jafari, R., Yekanik, M., Jalalpour, M., Sajjad Jalali, A., Mojaradiafra, M., Abbasi Kohan, H., Reza Izadi, H., Williams, N.P., Ferrer, M. & Conway, G.J.
Published: 2020
10.11.20
Papers
Individual variability and versatility in an eco-evolutionary model of avian migration
Author: Delmore, K.E., Van Doren, B.M., Conway, G.J., Curk, T., Garrido-Garduño, T., Germain, R.R., Hasselmann, T., Dieter Hiemer, D., van der Jeugd, H.P., Justen, H., Ramos, J.S.L., Maggini, I., Meyer, B.S., Phillips, R.J., Remisiewicz, M., Roberts, G.C.M., Sheldon, B.C., Vogl, W. & Liedvogel, M.,
Published: 2020
New collaborative research, involving BTO, has used tiny tracking devices to investigate unanswered questions about Blackcap migration.
04.11.20
Papers Ringing and Migration

Electrical Components Involved in Avian-Caused Outages in Iran
Author: Kolnegari, M., Conway, G.J., Akbar Basiri, A., Panter, C.T., Hazrati, M., Rafiee, M.S., Ferrer, M. & Dwyer, J.S.
Published: 2020
03.11.20
Papers
Pollinator monitoring more than pays for itself
Author: Breeze, T.D., Bailey, A.P., Balcombe, K.G., Brereton, T., Comont, R., Edwards, M., Garratt, M.P., Harvey, M., Hawes, C., Isaac, N., Jitlal, M., Jones, C.M., Kunin, W.E., Lee, P., Morris, R.K.A., Musgrove, A., O'Connor, R.S., Peyton, J., Potts, S.G., Roberts, S.P.M., Roy, D.B., Roy, H.E., Tang, C.Q., Vanbergen, A.J. & Carvell, C.
Published: 2020
08.10.20
Papers
Using citizen science to assess drivers of Common House Martin breeding performance
Author: Kettel, E.F., Woodward, I.D., Balmer, D.E. & Noble, D.G.
Published: 2020
House Martin numbers in the UK have declined by 39% over a 25 year period, but it is unclear why. This small hirundine is a summer visitor that spends the winter months in an unknown part of sub-Saharan Africa, returning to build their cup-shaped nests under the eaves of buildings during April and May. In the 2016 and 2017 breeding seasons, BTO ran the House Martin Nest Study which involved members of the public monitoring the breeding behaviour of House Martins nesting close to where they lived.
02.10.20
Papers
