The size and migratory origins of the population of Hen HarriersCircus cyaneuswintering in England

The status of the Hen Harrier,Circus cyaneus, in the UK and Isle of Man in 2010

“…It is important that the UK and Isle of Man Hen Harrier population continues to be monitored regularly, and we suggest that the current survey cycle of six years is maintained. The close links between wintering and breeding populations in the UK reported by Dobson et al (2012) emphasize the need for further research to be carried out to investigate causes of the most recent declines, not just on breeding sites, but also at winter locations and roost sites.…”

Conservation management of moorland: a case study of the effectiveness of a combined suite of management prescriptions which aim to enhance breeding bird populations

“…Few birds are reliant on single habitats and the distribution and abundance of species can be influenced by the distribution and availability of diverse habitats surrounding their breeding areas (Heikkinen et al 2004, Wretenberg et al 2010) and for non-resident species, the conditions within the areas that they occur outside of the breeding season (Newton 1998, Dobson et al 2012. Amongst the suite of moorland breeding birds monitored at the mitigation area probably only Red Grouse and potentially Winter Wren relied exclusively or predominantly on the moorland habitat all year.…”