The British Trust for Ornithology

SHELDUCK
Tadorna tadorna

Shelduck © Tommy Holden
 
Conservation Listings

Table 4/Amber (important breeding and wintering populations)
Biodiversity Steering Group Conservation Concern List

  Long term trend
UK: Increase
 
Status Summary
The UK winter Shelduck population has shown a general increase since 1965 (Musgrove et al. 2001). The CBC shows a similar increase until the 1980s, after which numbers stabilised, although it is unlikely to be representative of the population as a whole. Recent declines shown by the BBS and by WeBS (Musgrove et al. 2001) may reveal emerging problems for the species.
 
 
Table of population changes for Shelduck
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC all habitats 31 1968-1999 18 300 94 787   Unrepresentative? small sample
  25 1974-1999 21 12 -40 118   Unrepresentative?
  10 1989-1999 21 3 -21 40   Unrepresentative?
  5 1994-1999 23 4 -18 39   Unrepresentative?
BBS UK 6 1994-2000 114 -47 -56 -35 (>25)  
BBS England 6 1994-2000 95 -19 -35 -1    
The Breeding Bird Survey is jointly funded by BTO, JNCC and RSPB
 
 
Productivity information is not currently 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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