The British Trust for Ornithology
RED-THROATED DIVER
Gavia stellata

Red-Throated Diver © Paul Doherty
Conservation listings

Table 4/Amber (European status)
Biodiversity Steering Group Conservation Concern List
Long-term trend
UK: Unknown
Shetland: Stable
 
Status summary
Increasing nest failure rates during the egg stage are a cause of concern for this species due to its unfavourable European conservation status. The increase represents a change from 16% to 34% of nests failing over the 27-day egg stage (26d incubation + 1d egg laying). It should be noted that, although many of the nest records come from Orkney, there are also reasonable numbers of records from Shetland, mainland Scotland and the Western Isles. Population trends are not monitored by the BTO, but the UK Seabird Monitoring Programme shows that numbers on Shetland fluctuated around a stable level during 1980-99 (Upton et al. 2000).
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 19 1980-1999 28 None       Small sample
Brood size 19 1980-1999 42 None        
Daily failure rate (eggs) 19 1980-1999 16 None       Small sample
Daily failure rate (chicks) 19 1980-1999 23 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., 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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