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BTO Blueline
MALLARD
Anas platyrhynchos
Conservation listings

Europe: no SPEC category, secure
UK: Green

Long-term trend
UK, England: rapid increase
Status summary
Mallards have increased steadily in the UK since the 1960s, an increase that may have been contributed to by large-scale releases for shooting (Marchant et al. 1990). Winter populations have declined since the late 1980s (Musgrove et al. 2001), linked apparently to a decrease in continental immigration (Wernham et al. in press). Substantial and increasing numbers of Mallards, especially on WBS plots, originate from domesticated birds and do not resemble wild-type birds in plumage or behaviour.
CBC/BBS UK graph
Table of population changes for Mallard
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC/BBS UK 33 1967-2000 299 171 113 243    
  25 1975-2000 365 67 45 99    
  10 1990-2000 693 25 14 40    
  5 1995-2000 1073 19 13 27    
CBC/BBS England 33 1967-2000 253 188 128 269    
  25 1975-2000 307 69 44 100    
  10 1990-2000 582 25 10 39    
  5 1995-2000 897 22 14 30    
WBS waterways 25 1975-2000 58 196 125 296    
  10 1990-2000 25 51 28 78    
  5 1995-2000 25 11 4 19    
BBS UK 8 1994-2002 926 39 30 48    
BBS England 8 1994-2002 773 35 26 45    
BBS Scotland 8 1994-2002 82 50 17 93    
BBS Wales 8 1994-2002 52 -8 -32 25    
BBS acknowledgement
CBC/BBS England graph
WBS UK graph
BBS UK graph
BBS England graph
BBS Scotland graph
BBS Wales graph
Productivity information is not currently available for this species
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This report should be cited as:
Crick, H.Q.P., Marchant, J.H., Noble, D.G., Baillie, S.R., 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. (2004)
Breeding Birds in the Wider Countryside: their conservation status 2003.
BTO Research Report No. 353. BTO, Thetford. (http://www.bto.org/birdtrends2003)

Pages maintained by Susan Waghorn and Iain Downie: Last updated 16 February, 2009