The British Trust for Ornithology
MALLARD
Anas platyrhynchos
Conservation Listings

Unlisted/Green
Biodiversity Steering Group Conservation Concern List

  Long term trend
UK: 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).
Table of population changes for Mallard
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC all habitats 31 1968-1999 112 110 61 166    
  25 1974-1999 118 58 29 89    
  10 1989-1999 110 17 1 34    
  5 1994-1999 116 9 -3 23    
CBC farmland 31 1968-1999 62 78 45 136    
  25 1974-1999 64 33 10 72    
  10 1989-1999 65 11 -3 29    
  5 1994-1999 66 3 -7 17    
WBS waterways 24 1975-1999 93 192 116 294    
  10 1989-1999 108 59 33 91    
  5 1994-1999 112 15 6 24    
BBS UK 6 1994-2000 914 25 17 33    
BBS England 6 1994-2000 762 26 17 35    
BBS Scotland 6 1994-2000 85 41 10 79    
BBS Wales 6 1994-2000 49 -40 -57 -15 (>25) Small sample
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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