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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: The size and migratory origins of the population of Hen Harriers Circus cyaneus wintering in England
Authors: Dobson, Andrew
Clarke, Michele
Kjellen, Nils
Clarke, Roger
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Issue Date: 2012
Publisher: Taylor and Francis
Citation: Dobson A, Clarke M, Kjellen N & Clarke R (2012) The size and migratory origins of the population of Hen Harriers Circus cyaneus wintering in England, Bird Study, 59 (2), pp. 218-227.
Abstract: Capsule: The majority of Hen Harriers Circus cyaneus that spend the winter in England are derived from the British breeding population. Aims: To investigate the popular hypothesis that Hen Harriers which over-winter in England are derived principally from breeding populations in mainland Europe. Methods: Demographic data were used to estimate numbers of Hen Harriers in Britain at the end of the breeding season. This figure was used, together with data from winter (October-March inclusive) recoveries of Hen Harriers ringed in Britain during the breeding season, to estimate the number of birds from the British breeding population wintering in England and in other parts of Europe. Results: It was estimated that Hen Harriers wintering in England are derived primarily from British breeding populations. Published winter population figures for British Hen Harriers may be significant underestimates. Conclusion: The link between breeding and wintering populations of Hen Harriers in Britain is closer than previously thought. Conservation action should be spread more equally between the environmental factors which limit populations in different seasons. The winter population in Britain, as monitored by the Hen Harrier Winter Roost Survey, may provide a good indication of the status of the breeding population.
Type: Journal Article
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Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Biological and Environmental Sciences
University of Nottingham
Lund University
Zoological Society of London

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