BTO - Breeding Birds of the Wider Countryside: Ring Ouzel

RING OUZEL
Turdus torquatus

Conservation listings

Table 4/Amber (25-49% distribution decline)
Biodiversity Steering Group Conservation Concern List

Long-term trend

Probable decline

Status summary

The 1998-91 Breeding Atlas showed a decline throughout its range of 27% in the number of 10-km squares occupied between 1968-72 and 1988-91 (Gibbons et al. 1993). Reasons for the decline are unknown but the following have been suggested: afforestation, disturbance, climatic warming and competition with Blackbirds. Declines in chick-stage failure rates (14 days) from 28% to 8% may have occurred as the species retreats 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
(yrs) Years Mean
annual
sample Trend Predicted
in first year Predicted
in last year Change Comment

Brood size 31 1968-1999 25 None Small sample

Daily failure rate (eggs) 31 1968-1999 12 None Small sample

Daily failure rate (chicks) 31 1968-1999 16 Linear decline 0.0229 nests/day 0.0062 nests/day -0.0167 nests/day Small sample

Laying date 31 1968-1999 27 Linear decline day 135 day 128 -7 days Small sample

Insufficient data on clutch size
available for this species

Insufficient data on CES
available for this species

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This report should be cited as:
Baillie, S.R., Crick, H.Q.P., Balmer, D.E., Beaven, L.P., Downie, I.S., Freeman, S.N., Leech, D.I., Marchant, J.H.,
Noble, D.G., Raven, M.J., Simpkin, A.P., Thewlis, R.M. and Wernham, C.V. (2002) Breeding Birds in the Wider
Countryside: their conservation status 2001. BTO Research Report No. 278. BTO, Thetford. (http://www.bto.org/birdtrends)

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This page last updated: 21 April, 2008

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