Senior Research Ecologist

Chris's principal role is undertaking research into changes in the abundance and foraging behaviour of seabirds and waterbirds in relation to both man-made impacts and environmental processes. He takes a central role in conducting and developing marine research projects at BTO.
Chris's post entails a broad spectrum of research projects. Current key research includes the use of bird-borne logging devices to understand foraging behaviour, distribution and interaction of seabirds with offshore windfarms. He recently completed a review into the foraging ranges of UK breeding seabirds with a view to such data being used as a preliminary tool in identifying candidate marine protected areas (MPAs). Recent work has also explored the use of sea-watching data for monitoring the non-breeding movements of species past our coasts. Chris is also involved in environmental impace assessments of renewable energy developments on waterbird and seabird populations. He is involved in numerous other projects investigating the impacting of offshore developments on birds, and have previously completed a review of the use high definition imagery technology for surveying seabirds and marine mammals.
Other Information
Chris has a broad interest in the natural sciences with a research background in seabird ecology. He has a keen interest in seabird foraging behaviour, population ecology, and life-history environment interactions. He is an ordinary Member of the Seabird Group, and am a guest lecturer as part of BSc and MSc University modules.
BSc (Hons) Geography, University of Reading, 1999-2002. MSc Wildlife Conservation and Management, University of Newcastle, 2002-2003. PhD Foraging and Breeding Ecology of Guillemots and Razorbills, University of Leeds, 2005-2008.
Recent BTO Publications
- Martín Vélez, V., Cano-Povedano, J., Cañuelo-Jurado, B., López-Calderón, C., Céspedes, V., Ros, M., Sánchez, M.I., Shamoun-Baranes, J., Müller, W., Thaxter, C.B., Camphuysen, C.J., Cózar & Green, A.J. Leakage of plastics and other debris from landfills to a highly protected lake by wintering gulls 10.1016/j.wasman.2024.01.034 View at journal website( DOI:10.1016/j.wasman.2024.01.034 )
- O’Hanlon, N.J., van Bemmelen, R.S.A., Conway, G.J., Thaxter, C.B., Aiton, H., Aiton, D., Balmer, D.E., Calladine, J.R., Harris, S.J. & Humphreys, E.M. New insights into the migration and wintering areas of Scottish-breeding Arctic Skuas View at journal website( DOI: )
- O'Hanlon, N.J., van Bemmelen, R.S.A., Snell, K.R.S., Conway, G.J, Thaxter, C.B., Aiton, H., Aiton, D., Balmer, D.E., Are Hanssen, S., Calladine, J.R., Hammer, S., Harris, S.J., Moe, B., Schekkerman, H., Tulp, I. & Humphreys, E.M. Atlantic populations of a declining oceanic seabird have complex migrations and weak migratory connectivity to staging areas 10.3354/meps14533 View at journal website( DOI:10.3354/meps14533 )
- Thaxter, C.B., Green, R.M.W., Collier, M.P., Taylor, R.C., Middelveld, R.P., Scragg, E.S., Wright, L.J., Cook, A.S.C.P. & Fijn, R.C. Behavioural responses of Sandwich terns following the construction of offshore wind farms 10.1007/s00227-023-04353-7 View at journal website( DOI:10.1007/s00227-023-04353-7 )
- O’Hanlon, N.J., Harris, S.J., Thaxter, C.B., Boersch-Supan, P.H., Robinson, R.A., Balmer, D.E. & Burton, N.H.K. Seabird population and demographic monitoring in the UK: a review and recommendations for future sampling View at journal website( DOI: )
- Boersch-Supan, P.H., Brighton, C.H., Thaxter, C.B. & Cook, A.S.C.P. Natural body size variation in seabirds provides a fundamental challenge for flight height determination by single-camera photgrammetry. A comment on Humphries et al. 2023 View at journal website( DOI: )
- Woodward, I.D., Thaxter, C.B., Owen, E., Bolton, M., Ward, R.M. & Cook, A.S.C.P. The value of seabird foraging ranges as a tool to investigate the impact of offshore wind farms 10.1016/j.ocecoaman.2024.107192 View at journal website( DOI:10.1016/j.ocecoaman.2024.107192 )
- 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. Challenges in quantifying the responses of Black-legged Kittiwake to habitat variables and local stressors due to individual variation 10.1080/00063657.2024.2305169 View at journal website( DOI:10.1080/00063657.2024.2305169 )
- Davies, J.G., Boersch-Supan, P.H., Clewley, G.D., Humphreys, E.M., O’Hanlon, N.J., Shamoun-Baranes, J., Thaxter, C.B., Weston, E. & Cook, A.S.C.P. Influence of wind on kittiwake Rissa tridactyla flight and offshore wind turbine collision risk 10.1007/s00227-024-04508-0 View at journal website( DOI:10.1007/s00227-024-04508-0 )
- van Bemmelen, R.A., Leemans, J.J., Collier, M.P., Green, R.M.W., Middelveld, R.P., Thaxter, C.B. & Fijn, R.C. Avoidance of offshore wind farms by Sandwich Terns in the North Sea increases with turbine density 10.1093/ornithapp/duad055 View at journal website( DOI:10.1093/ornithapp/duad055 )