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BTO Blueline
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BTO Blueline
Turdus torquatus
Ring Ouzel © G H Higginbotham
Conservation listings

Europe: SPEC category 4, secure
UK: Red (>50% population decline)

Long-term trend
UK: probable decline
Status summary
The 1988-91 Breeding Atlas showed a decline of 27% in the number of 10-km squares occupied between 1968-72 and 1988-91 (Gibbons et al. 1993), and the extent of population decline has now been established by a special survey. A 58% decline was estimated for the period between 1988-91 and 1999, warranting Red listing for this species (Wotton et al. 2002). Reasons for the decline are unknown but afforestation, disturbance, climatic warming, and competition with Blackbirds have all been suggested. Declines in chick-stage nest failure rates may be linked to the retreat of the species to its most favoured areas.
Annual breeding population changes for this species
are not currently monitored by BTO
Table of productivity information for Ring Ouzel
Variable Period
Years Mean
Trend Predicted
in first year
in last year
Change Comment
Brood size 33 1968-2001 25 None       Small sample
Daily failure rate (eggs) 33 1968-2001 12 None       Small sample
Daily failure rate (chicks) 33 1968-2001 16 Linear decline 0.0229 nests/day 0.0057 nests/day -0.0172 nests/day Small sample
Laying date 33 1968-2001 27 Linear decline day 135 day 127 -8 days Small sample
Insufficient data on clutch size
available for this species
Brood size graph
Egg nest failure graph
Chick nest failure graph
Laying date graph
Insufficient data on CES
available for this species
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This report should be cited as:
Crick, H.Q.P., Marchant, J.H., Noble, D.G., Baillie, S.R., Balmer, D.E., Beaven, L.P., Coombes, R.H.,
Downie, I.S., Freeman, S.N., Joys, A.C., Leech, D.I., Raven, M.J., Robinson, R.A. and Thewlis, R.M. (2004)
Breeding Birds in the Wider Countryside: their conservation status 2003.
BTO Research Report No. 353. BTO, Thetford. (http://www.bto.org/birdtrends2003)

Pages maintained by Susan Waghorn and Iain Downie: Last updated 16 February, 2009