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RED-THROATED DIVER
Gavia stellata

Red-Throated Diver © Paul Doherty
 

• Population
  changes

• Productivity
  trends

• Additional
  information
Conservation listings
Europe: SPEC category 3 (depleted)
UK: amber (25–50% population decline)
Long-term trend
Shetland: moderate decline
UK population size
935–1,500 pairs in 1994 (Gibbons et al. 1997: BiE04, APEP06)
Status summary
Population trends are not monitored by the BTO, but JNCC's Seabird Monitoring Programme shows that numbers at sample study areas in Shetland fluctuated without long-term change during 1980–2005, with low points in 1980, 2000 and 2004 (Mavor et al. 2006). 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. Since the 1980s, there may have been some tendency for more pairs to hatch a second chick, although two-chick broods are only occasional in Orkney and the proportion of nest records from there could have changed over time.
 

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

Productivity trends
Clutch size graph
Brood size graph
Egg nest failure graph
Chick nest failure graph

 

Insufficient data on laying date
available for this species

 

 

Insufficient data on CES
available for this species

 
 

Additional information
BTO blue divider
 

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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., Barimore, C., Coombes, R.H.,
Downie, I.S., Freeman, S.N., Joys, A.C., Leech, D.I., Raven, M.J., Robinson, R.A. & Thewlis, R.M. (2007)
Breeding Birds in the Wider Countryside: their conservation status 2007.
BTO Research Report No. 487. BTO, Thetford. (http://www.bto.org/birdtrends)

Pages maintained by Susan Waghorn and Iain Downie: Last updated 7 November, 2008