Jacob Davies

Research Ecologist

Jacob works as a Research Ecologist on the Wetland & Marine Team, carrying out data analysis for a wide range of projects.

Interests & Responsibilities

Since joining the BTO recently, Jacob has used terrestrial climate and oceanographic data to predict future seabird abundance in western Scotland, Northern Ireland and Ireland under climate change as part of the MarPAMM project. Jacob has broad research interests in ecology, particularly in demography and range dynamics and in the analysis of large spatial datasets. For his PhD research on the causes of Reed Warbler’s recent range expansion in Britain, he carried out colour-ringing and analysed CES, NRS, ringing and satellite data using hierarchical and individual-based models. Jacob’s original background in ornithology includes upland and woodland fieldwork in Scotland and the USA, mostly on raptors and passerines, and analysis of farmland wader declines. Jacob is also a keen nest recorder and holds a ‘C’ ringing permit.


BA (Hons.) Biological Sciences, University of Oxford, 2009.
MRes Ecology and Environmental Biology, University of Glasgow, 2012.
PhD Dispersal and range expansion in reed warbler, University of York, 2019.

Recent BTO Publications

O’Hanlon, N.J., Thaxter, C.B., Clewley, G.D., Davies, J.G., Humphreys, E.M., Miller, P.I. Pollock, C.J., Shamoun-Baranes, J., Weston, E. & Cook, A.S.C.P. 2024. Challenges in quantifying the responses of Black-legged Kittiwake to habitat variables and local stressors due to individual variation. Bird Study View at journal website (DOI: 10.1080/00063657.2024.2305169)
Davies, J.G., Humphreys, E.M., Evans, T., Howells, R., O’Hara-Murray, R. & Pearce-Higgins, J.W. 2023. Seabird abundances projected to decline in response to climate change in Britain and Ireland. Marine Ecology Progress Series View at journal website (DOI: 10.3354/meps14462)
Johnston, D.T., Thaxter, C.B., Boersch-Supan, P.H., Davies, J.G., Clewley, G.D., Green, R.M.W., Shamoun-Baranes, J., Cook, A.S.C.P., Burton, N.H.K. & Humphreys, E.M. 2023. Flight heights obtained from GPS versus altimeters influence estimates of collision risk with offshore wind turbines in Lesser Black-backed Gulls Larus fuscus. Movement Ecology 11 View at journal website (DOI: 10.1186/s40462-023-00431-z)
Cook, A.S.C.P., Thaxter, C.B., Davies, J., Green, R.M.W., Wischnewski, S. & Boersch-Supan, P. 2023. Understanding seabird behaviour at sea part 2: improved estimates of collision risk model parameters. Link to publication ISBN: 978-1-83521-271-4
Woodward, I.D., Franks, S.E., Bowgen, K., Davies, J.G., Green, R.M.W., Griffin, L.R., Mitchell, C., O’Hanlon, N., Pollock, C., Rees, E.C., Tremlett, C., Wright, L. & Cook, A.S.C.P. 2023. Strategic study of collision risk for birds on migration and further development of the stochastic collision risk modelling tool (Work Package 1: Strategic review of birds on migration in Scottish waters). Link to publication ISBN: 978-1-83521-034-5
Davies, J.G., Kirkland, M., Miller, M.G.R., Pearce-Higgins, J.W., Atkinson, P.W. & Hewson, C.M. 2023. Spring arrival of the Common Cuckoo at breeding grounds is strongly determined by environmental conditions in tropical Africa. Proceedings of the Royal Society B 290 Link to publication View at journal website (DOI: 10.1098/rspb.2023.0580)

Other Publications

Amar, A., Davies, J., Meek, E., Williams, J., Knight, A. & Redpath, S. 2011. Long-term impact of changes in sheep Ovis aries densities on the breeding output of the hen harrier Circus cyaneus. Journal of Applied Ecology 48: 220–227.

Davies, J., Arthur, D. & White, S. 2014. Effects of variation in breeding habitat on Ring Ouzel Turdus torquatus productivity and chick condition. Bird Study 61: 162-170.  

Peters, N., Kendell, C.J., Davies, J.G., Bracebridge, C., Nicholas, A., Mgumba, M.P. & Beale, C.M. 2023. Indentifying priority locations to protect wide-ranging endangered species. Biological Conservation 27: 109828.

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