Wider Countryside Report Header
BTO Blueline
Main WCR menu image Site navigation menu item Results overview menu item Other info menu item BTO website menu item
BTO Blueline


Phylloscopus sibilatrix
Wood Warbler © www.grayimages.co.uk

• Population

• Productivity

• Additional

Conservation listings
Europe: SPEC category 2 (declining)
UK: red (breeding decline, European status)
UK Biodiversity Action Plan: priority species
Long-term trend
UK: decline
UK population size
17,200 (15,830–18,570) males in 1984–85 (Bibby 1989: APEP06); 9,000–10,500 pairs in 2000 (updated using BBS trend: BiE04)
Status summary
Wood Warblers, which have a westerly distribution in Britain, were monitored relatively poorly until BBS began. Little change was evident at the few CBC plots on which the species occurred (Marchant et al. 1990, Crick et al. 1998). The species' breeding range varied little between the two atlas periods (Gibbons et al. 1993), but has subsequently retreated heavily from lowland England. BBS shows a rapid and significant decline since 1994, and accordingly the species was moved from the green to the amber list in 2002; continued decline has now warranted a further shift to the red list. Nest success has apparently improved considerably at the egg stage, although nest record samples are small. There has been no trend in the number of fledglings per breeding attempt. With declines evident across northern and western Europe, this previously 'secure' species is now provisionally categorised as 'declining' (BirdLife International 2004). Numbers have shown widespread moderate decrease across Europe since 1980 (PECBMS 2010).
CBC/BBS UK graph

1995-2008: -61% (confidence interval -73% to -47%)

Population changes in detail

 Demographic trends

Fledglings per breeding attempt graph
Laying date graph
More on demographic trends
Additional information

BTO blue divider

BTO Home | JNCC Home
 © British Trust for Ornithology. Charity No 216652 (England and Wales).Charity No SC039193 (Scotland)
Company Limited by Guarantee No 357284 (England and Wales).
Registered Office: The Nunnery, Thetford, Norfolk IP24 2PU, UK.
Terms and Conditions
| Privacy Statement          Email:

This report should be cited as: Baillie, S.R., Marchant, J.H., Leech, D.I., Renwick, A.R., Joys, A.C., Noble, D.G., Barimore, C., Conway, G.J., Downie, I.S., Risely, K. & Robinson, R.A. (2010). Breeding Birds in the Wider Countryside: their conservation status 2010. BTO Research Report No. 565. BTO, Thetford. (http://www.bto.org/birdtrends)

Pages maintained by Iain Downie, Mandy T Andrews and Laura Smith: Last updated 06.10.2010