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GREY HERON Ardea cinerea
 
Conservation Listings Long term trend

Unlisted/Green
Biodiversity Steering Group: Unlisted

UK: increasing
 
Status Summary
The Heronries Census, which has monitored Grey Herons since 1928, now shows the species to be more abundant than ever before as it has recovered from a crash caused by the cold winter of 1962-1963 and perhaps benefits from warmer winters, reduced persecution, falling pollution and increased stocking levels in freshwater fisheries (Gibbons et al. 1993, Marchant et al. in prep.).
 
 
Table of population changes for Grey Heron
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
Heronries Census 69 1929-1998 . 65 . .    
  25 1973-1998 . 16 . .    
  10 1988-1998 . 26 . .    
  5 1993-1998 . 8 . .    
BBS UK 5 1994-1999 441 14 1 28    
BBS England 5 1994-1999 357 0 -12 13    
BBS Scotland 5 1994-1999 40 83 17 186   Small sample
BBS Wales 5 1994-1999 31 -2 -37 53   Small sample

The Breeding Bird Survey is jointly funded by BTO, JNCC and RSPB

 
 
Table of productivity information for Grey Heron
Variable Period
(yrs)
Years Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Clutch size 30 1968-1998 12 None       Small sample
Brood size 30 1968-1998 75 None        
Daily failure rate (eggs) 30 1968-1998 14 None       Small sample
Daily failure rate (chicks) 30 1968-1998 26 Linear decline 0.0688 nests/day 0.0008 nests/day -0.068 nests/day Small sample
Laying date 30 1968-1998 15 Curvilinear day 99 day 110 11 days Small sample
 
Insufficient data on CES
available for this species

 

   



The report should be cited as: Baillie, S.R., Crick, H.Q.P., Balmer, D.E., Bashford, R.I., Beaven, L.P., Freeman, S.N., Marchant, J.H., Noble, D.G., Raven, M.J., Siriwardena, G.M., Thewlis, R. and Wernham, C.V. (2001) Breeding Birds in the Wider Countryside: their conservation status 2000. BTO Research Report No. 252. BTO, Thetford. (http://www.bto.org/birdtrends)

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Last updated: 19 April, 2001

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