Samuel Langlois

Research Ecologist

Sam works within the Wetland and Marine team on a variety of projects involving field- and desk-based work on seabirds. 

Interests & Responsibilities

Sam has a strong background in ornithological work, having spent four breeding seasons collecting data and studying the seabird populations of the Isle of May. Between 2019 and 2023 he undertook a PhD at the University of the Highlands and Islands where he investigated the population dynamics, predator-prey relationships and foraging ecology of Great Black-backed Gulls in a conservation context. Sam is particularly interested in foraging ecology, and how, for example, mechanisms such as foraging specialisation lead to inter-individual differences in foraging behaviour and demographic rates. 

Sam is passionate about all aspects of a research project, from its conceptualisation through to fieldwork, data collection, and the analysis and write-up of reports and peer-reviewed publications. He works within the Wetland and Marine Team on a range of projects involving seabird tracking, ringing, and population monitoring.

Sam has been interested in nature since a very young age, with a particular interest in birds. Birdwatching, bird ringing, and wildlife photography are his main interests alongside cycling and racket sports.


BSc (Hons) Marine Biology, University of Aberdeen, 2018
PhD, University of Highlands and Islands: ‘The foraging ecology and conservation of the Great Black-backed Gull
Larus marinus’, 2019 – present.

Recent BTO Publications

Langlois Lopez, S., Clewley, G.D., Johnston, D.T., Daunt, F., Wildon, J.M., O'Hanlon, N.J. & Masden, E. 2023. Reduced breeding success in Great Black-backed Gulls Larus marinus due to harness-mounted GPS device. Ibis View at journal website (DOI: 10.1111/ibi.13247)

Other Publications

Langlois Lopez, S., Isaksson, N., Fraser, S. and Masden, E.A. 2022. Successful trial of mist nets and whoosh nets to catch non-breeding European Shags Gulosus aristotelis at a daytime roost. Ringing & Migration 37(1-2), pp.45-50.

Langlois Lopez, S., Daunt, F., Wilson, J., O'Hanlon, N.J., Searle, K.R., Bennett, S., Newell, M.A., Harris, M.P. and Masden, E. 2023. Quantifying the impacts of predation by Great Black-backed Gulls Larus marinus on an Atlantic Puffin Fratercula arctica population: Implications for conservation management and impact assessments. Marine Environmental Research 188, p.105994.

Langlois Lopez, S., Bond, A.L., O’Hanlon, N.J., Wilson, J.M., Vitz, A., Mostello, C.S., Hamilton, F., Rail, J.-F., Welch, L., Boettcher, R., Wilhelm, S.I., Anker-Nilssen, T., Daunt, F., Masden, E. 2022. Global population and conservation status of the Great Black-backed Gull Larus marinus. Bird. Conserv. Int. 1–11.

Content Related to Samuel Langlois