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
Cettia cetti
Cetti's Warbler © Moss Taylor

• Population

• Productivity

• Additional

Conservation listings
Europe: no SPEC category (favourable conservation status in Europe, not concentrated in Europe)
UK: green
Long-term trend
England, Wales: increase
UK population size
534 pairs in 1997–2001 (RBBP data: BiE04); mean of 645 pairs in 1998–2002 (RBBP data: APEP06); at least 2,257 singing males or territories in 2008 (Holling & RBBP 2010b)
Status summary
Cetti's Warblers were first recorded in Britain as recently as 1961. Colonisation, which began in Kent in 1972 or 1973, continues to be monitored annually by RBBP. Numbers and breeding range increased spectacularly during the first 12 years, with Norfolk and Dorset gradually overtaking Kent as the main host counties (Gibbons et al. 1993, Wotton et al. 1998). Severe winters after 1978 led to the temporary extinction of the Kent population in 1988. Populations in milder regions continued to grow, but overall the UK population fell by over a third between 1984 and 1986. In the absence of severe winters since 1986, increase and range expansion have continued. The first breeding records north of the Humber were made in 2006 (Holling & RBBP 2009). Much constant-effort ringing takes place in prime Cetti's Warbler habitat; despite the comparative rarity of this species, therefore, CES population and productivity indices are already available (Robinson et al. 2007). CES data confirm the species' sensitivity to cold winters, which appears to have become more evident as the breeding range has expanded into more testing climates. Numbers have risen steeply across Europe since 1990 (PECBMS 2010).
CES adult abundance graph

1998-2008: 244% (confidence interval 94% to 775%)

Population changes in detail
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 05.10.2010