Hannah Hereward

Research Ecologist

Hannah works as a Research Ecologist, analysing quantitative data from a range of projects across Wales.

Interests & Responsibilities

Hannah is interested in combining traditional and novel monitoring techniques to better understand species’ behaviours and ecology (at a variety of scales, from individual through to community level), especially in light of changes in their environments (be it human induced or natural), in order to aid conservation efforts if appropriate.

She completed her PhD at Cardiff University, where she assessed the conservation biology of two species of seabird that breed on the same islet, but at different times of year. This included developing a bespoke Raspberry Pi based camera system to gain a snapshot of behaviours and potential threats in nests.

Prior to her PhD Hannah has studied a wide range of different species across a variety of habitats. These have ranged from tropical coral reef fish behaviours to interactions between a temperate reef seaweed and a limpet that almost exclusively relies on it to survive, to monitoring migrating waders and migrating and breeding passerines (including Swallows).

Hannah is based within the BTO Cymru office looking at Welsh bird populations and their conservation.


  • BSc (Hons) Wildlife Conservation, Nottingham Trent University, 2015
  • MRes Marine Biology, University of Plymouth, 2017
  • PhD Ecology: ‘The conservation biology of the Monteiro’s storm-petrel and band-rumped storm-petrel on Ilhéu da Praia, Azores’, 2022

Recent BTO Publications

Hereward, H.F.R., Macgregor, C.J., Gabb, O., Connell, A., Thomas, R.J., Cross, A.V. & Taylor, R.C. 2024. Modelling population-level impacts of wind farm collision risk on Welsh Red Kites. Research Report no. 766. British Trust for Ornithology, Thetford
Williams, J.M., Scott, S.E., Galbraith, C.A., Martay, B., Macphie, K.H., Hereward, H.F.R., Barton, M.G., Bowgen, K.M., Pearce-Higgins, J.W. & Robinson, R.A. 2023. Climate change and migratory species: a review of impacts, conservation actions, indicators and ecosystem services.. JNCC, Peterborough Link to publication ISBN: 978-0-86139-000-7
Clark, B.L. et al. 2023. Global assessment of marine plastic exposure risk for oceanic birds. Nature Communications 14 View at journal website (DOI: 10.1038/s41467-023-38900-z)

Other Publications

Neves V.C., Carroll G., Schäfer W.C., Hereward H.F.R. & Quillfeldt P. 2023. Consistent foraging habitat use by a vulnerable breeding seabird highlights potential areas for protection in the mid-Atlantic Ocean. Marine Ecology Progress Series 716: 107–121

Long, S.E., Devlin, J.J., Raposo, P., Porter, B.J. & Hereward, H.F.R. 2021. Habitat categorisation and mapping of a seabird reserve: Ilhéu da Praia, Azores. Seabird 33: 53–65

Hereward H.F.R., Facey R.J., Sargent A.J., Roda S., Couldwell M.L., Renshaw E.L., Shaw K.H., Devlin J.J., Long S.E., Porter B.J., Henderson J.M., Emmett C.L., Astbury L., Maggs L., Rands S.L., & Thomas R.J. 2021. Raspberry Pi nest cameras – an affordable tool for remote behavioural and conservation monitoring of bird nests. Ecology and Evolution 11: 14585–14597

Hereward, H.F.R., King, N.G. & Smale, D.A. 2020. Intra-annual variability in responses of a canopy forming kelp to cumulative low tide heat stress: implications for populations at the trailing range edge. Journal of Phycology 56: 146–158

Hereward, H.F.R., Gentle, L.K., Ray, N.D. & Sluka, R.D. 2019. Habitat associations of hawkfish: depth, distribution, and density at two sites in Kenya. Bulletin of Marine Science 95: 265–276

Hereward, H.F., Foggo, A., Hinckley, S.L., Greenwood, J. & Smale, D.A. 2018. Seasonal variability in the population structure of a habitat-forming kelp and a conspicuous gastropod grazer: Do blue-rayed limpets (Patella pellucida) exert top-down pressure on Laminaria digitata populations? Journal of Experimental Marine Biology and Ecology 506: 171–181

Cowburn, B., Musembi, P.M., Sindorf, V., Kohlmeier, D., Raker, C., Nussbaumer, A., Hereward, H.F.R., Van Baelenberghe, B., Goebbels, D., Kamire, J., Horions, M., Sluka, R.D., Taylor, M.L. & Rogers, A.D. 2018. The habitats and biodiversity of Watamu Marine National Park: evaluating our knowledge of one of East Africa's oldest marine protected areas. Atoll Research Bulletin 618: 1–45 

Hereward, H.F.R., Gentle, L.K., Ray, N.D. & Sluka, R.D. 2017. Ghost crab burrow density at Watamu Marine National Park: An indicator of the impact of urbanisation and associated disturbance? African Journal of Marine Science 39: 129–133

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