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Providing evidence to improve practice

Individual study: Supplementary feeding of hen harriers Circus cyaneus to reduce predation of red grouse Lagopus lagopus scoticus on Langholm Moor, Dumfries and Galloway, Scotland

Published source details

Redpath S.M., Thirgood S.J. & Leckie F.M. (2001) Does supplementary feeding reduce predation of red grouse by hen harriers? Journal of Applied Ecology, 38, 1157-1168


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Use supplementary feeding to reduce predation Bird Conservation

A controlled cross-over experiment, on moorland in southwest Scotland, UK, in 1998 and 1999 (Redpath et al. 2001) found that adult red grouse Lagopus lagopus scoticus survival was no higher in 13 hen harrier Circus cyaneus territories that were provided with a total of 256 kg of food in spring (over two years), than in control (unfed) territories (78% survival for 94 birds in fed areas vs. 74% of 97 in control areas). Supplementary feeding in the summer (when harriers are provisioning young) reduced the number of grouse chicks being brought to 14 fed broods, compared to ten unfed broods (an average of 0.5 chicks/100 hr, seven in total vs. 3.7 chicks/100 hr, 32 in total). However, there was no corresponding improvement in grouse breeding success in fed areas.