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BTO Blueline
WOOD WARBLER
Phylloscopus sibilatrix
Wood Warbler © Adrian Cawthorne
 
Conservation listings
Europe: SPEC category 2 (declining)
UK: amber (25-50% population decline)
Long-term trend
UK: decline
Distribution maps
Maps and statistics from British and Irish
atlases can be viewed here.
Status summary
Wood Warblers, which have a westerly distribution in Britain, were not monitored well until the inception of the BBS. Little change was apparent at the few CBC plots on which the species occurred (Crick et al. 1998). The species' range varied little between the two breeding atlas periods (Gibbons et al. 1993), but has subsequently shown further retreat from southeast England. BBS shows a rapid and significant decline since 1994, and accordingly the species has recently been moved from the green to the amber list. A decrease has been observed in nest failure rates at the egg stage. With declines evident across north and west Europe, this previously 'secure' species is now provisionally categorised as 'declining'.
 
CBC/BBS UK graph
 
Table of population changes for Wood Warbler
Source Period
(yrs)		 Years Plots
(n)		 Change
(%)		 Lower
limit		 Upper
limit		 Alert Comment
BBS UK 9 1994-2003 54 -68 -78 -55 (>50)  
BBS acknowledgement
 
Table of productivity information
Variable Period
(yrs)		 Years Mean
annual
sample		 Trend Predicted
in first year		 Predicted
in last year		 Change Comment
Clutch size 34 1968-2002 17 None       Small sample
Brood size 34 1968-2002 37 None        
Daily failure rate (eggs) 34 1968-2002 21 Linear decline 0.0197 nests/day 0.0081 nests/day -0.0116 nests/day Small sample
Daily failure rate (chicks) 34 1968-2002 27 None       Small sample
Laying date 34 1968-2002 32 None        
 
Clutch size graph
Brood size graph
Egg nest failure graph
Chick nest failure graph
Laying date graph
Insufficient data on CES
available for this species
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This report should be cited as:
Baillie, S.R., Marchant, J.H., Crick, H.Q.P., Noble, D.G., 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. (2005)
Breeding Birds in the Wider Countryside: their conservation status 2004.
BTO Research Report No. 385. BTO, Thetford. (http://www.bto.org/birdtrends)

Pages maintained by Susan Waghorn and Iain Downie: Last updated 18 January, 2006