John Calladine

Job Description

Senior Research Ecologist


John is responsible for managing, developing and undertaking research projects relevant to Scotland, in particular the development of BTO Scotland’s portfolio of studies related to forest and moorland management.


BSc (Hons) Ecology, University of Lancaster, 1979-1982 MSc (by research) ‘Colony attendance, nest site selection and breeding performance in the Herring and Lesser Black-backed Gull: implications for conservation management’, 1993-95. Honorary Lecturer in the School of Biological & Environmental Sciences, University of Stirling (since 2005)

Interests & Responsibilities

  • Direct and extensive experience of working on a range of applied conservation research and survey projects.
  • Extensive experience of interpreting survey results and reviewing for applied conservation purposes.
  • Involvement with practical land management issues and how they influence nature conservation interests.

Recent and current studies include: (i) long-term monitoring associated with moorland management; (ii) the bird communities in new native-type woodlands; (iii) bird-habitat relationships and the influence of restructuring the interface between conifer plantations and moorland and other aspects of plantation management; (iv) the development of survey methods for the monitoring of Short-eared Owls and for birds of alpine habitats in Scotland; (v) bird communities in short-rotation forestry energy crops; (vi) population changes in breeding waders on machair; (vi) reviews of the populations of predatory birds and the ecology of urban gulls in Scotland; (vii) studies on the winter ecology of some seed-eating birds; and (viii) studies on upland habitat selection by breeding Whinchats.

Other Information

An active bird ringer Honorary Lecturer in the School of Biological & Environmental Sciences, University of Stirling (since 2005)

Recent BTO Publications

David Jarrett, John Calladine, Chris Wernham & Mark Wilson 2017. Monitoring Breeding Waders in Wensleydale: trialling surveys carried out by farmers and gamekeepers. Research Report no. 703. British Trust for Ornithology, Thetford ISBN: 978-1-908581-85-3 PDF icon Download Report (1.87 MB)
Dario Massimino & John Calladine 2017. Modelled abundance and change in abundance of Red Deer and Roe Deer in Scotland from Breeding Bird Survey data. British Trust for Ornithology, Thetford PDF icon Download Report (761.78 KB)
Calladine, J., Jarrett, D., Wilson, M. & Edwards, C. 2017. Stand structure and breeding birds in managed Scots pine forests: Some likely long-term implications for continuous cover forestry. Forest Ecology and Management 397 : 174-184 View at journal website (DOI: 10.1016/j.foreco.2017.04.039)
M.V. Bell, Calladine, J. 2017. The decline of a population of farmland breeding waders: a twenty-five-year case study. Bird Study 64 (part 2) : 264-273 View at journal website (DOI: 10.1080/00063657.2017.1319903)
Calladine, J., Humphreys, E.M., Gilbert, L., Furness, R.W., Robinson, R.A., Fuller, R.J., Littlewood, N.A., Pakeman, R.J., Ferguson, J. & Thompson, C. 2017. <h1 lang="en">Continuing influences of introduced hedgehogs Erinaceus europaeus as a predator of wader (Charadrii) eggs four decades after their release on the Outer Hebrides, Scotland</h1>. Biological Invasions 19 : 1 981-1 987 View at journal website (DOI: 10.1007/s10530-017-1422-4)
Murray, C., Minderman, J., Allison, J. & Calladine, J. 2016. Vegetation structure influences foraging decisions in a declining grassland bird: the importance of fine-scale habitat and grazing regime. Bird Study 63 (part 2) : 223-232 View at journal website (DOI: 10.1080/00063657.2016.1180342)

Other publications

Calladine, J. 2004. Lesser Black-backed Gull. pp 226-241 in: Mitchell, P.I, Newton, S.F., Ratcliffe, N. & Dunn, T.E. (eds) Seabird Populations of Britain and Ireland. T.& A.D. Poyser, London.

Calladine, J., Baines, D. & Warren, P. 2002. Effects of reduced grazing on population density and breeding success of black grouse Tetrao tetrix in northern England. Journal of Applied Ecology 39: 772-780.

Calladine, J., Buner, F. & Aebischer, N.J. 1999. Temporal variations in the singing activity and detection efficiency of Turtle Doves Streptopelia turtur: implications for surveying. Bird Study 46: 74-80.

Calladine, J. 1997. A comparison of Herring Gull Larus argentatus and Lesser Black-backed gull Larus fuscus nest sites: their characteristics and relationships with breeding success. Bird Study 44: 318-326.

Calladine, J. 1997. The detection efficiency of color-banded Herring Gulls Larus argentatus and Lesser Black-backed Gulls Larus fuscus at the breeding colony: practical implications for the determination of adult survival rates. Colonial Waterbirds 20: 41-46.

Calladine, J. & Harris, M.P. 1997. Intermittent breeding in the Herring Gull Larus argentatus and the Lesser Black-backed Gull Larus fuscusIbis 139: 259-263

Wanless, S., Harris, M.P., Calladine, J. & Rothery, P. 1996. Modelling responses of herring gull and lesser black-backed gull populations to reduction of reproductive output: implications for control measures. Journal of Applied Ecology 33: 1420-1432.

Calladine, J., Harris, M.P., Taylor, S. & Wanless, S. 1995. The status of the Eider on the Isle of May and other Forth islands. Scottish Birds 18: 1-10.

Harris, M.P. & Calladine, J. 1993. A check of the efficiency of finding colour-ringed Kittiwakes Rissa tridactyla Ringing and Migration 14: 13-116.

Calladine, J., Dougill, S., Harding, N. & Stroud, D.A. 1990. Moorland birds on the Campsie Fells, Touch Hills and west Ochill Hills, Stirling: Habitats, distribution and numbers. Forth Naturalist and Historian 13: 3-69.