BTO - Breeding Birds of the Wider Countryside: Red-throated Diver

RED-THROATED DIVER
Gavia stellata

Red-Throated Diver © Paul Doherty

Conservation listings

Europe: SPEC category 3 (depleted)
UK: amber (25-50% population decline)

Long-term trend

Shetland: moderate decline

Distribution maps

Distribution maps for this species are not currently available online (see Atlases species help)

Status summary

Population trends are not monitored by the BTO, but the UK Seabird Monitoring Programme shows that numbers at sample study areas in Shetland fluctuated during 1980-2003, with low points in 1980 and 2000 (Mavor et al. 2004). Complete surveys of Shetland indicated a decrease of 36% there between 1983 and 1994, however (Gibbons et al. 1997). Since in 1994 Shetland held 28-45% of the total UK population, this warrants amber listing for Red-throated Diver, in addition to its depleted status in Europe as a whole.

Annual breeding population changes are not currently monitored by BTO for this species

Table of productivity information for Red-throated Diver

Variable Period
(yrs) Years Mean
annual
sample Trend Predicted
in first year Predicted
in last year Change Comment

Clutch size 22 1980-2002 25 None Small sample

Brood size 22 1980-2002 40 None

Daily failure rate (eggs) 22 1980-2002 15 None Small sample

Daily failure rate (chicks) 22 1980-2002 21 None Small sample

Insufficient data on laying date
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., Marchant, J.H., Crick, H.Q.P., Noble, D.G., 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. (2005) Breeding Birds in the Wider Countryside: their conservation status 2004. BTO Research Report No. 385. BTO, Thetford. (http://www.bto.org/birdtrends) Pages maintained by Susan Waghorn and Iain Downie: Last updated 18 January, 2006