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CETTI'S WARBLER
Cettia cetti
Cetti's Warbler © Moss Taylor
 

• Population
  changes

• Productivity
  trends

• Additional
  information
Conservation listings
Europe: no SPEC category (favourable conservation status in Europe, not concentrated in Europe)
UK: green
Long-term trend
England, Wales: rapid increase
UK population size
534 pairs in 1997–2001 (RBBP data: BiE04); mean of 645 pairs in 1998–2002 (RBBP data: APEP06); at least 1,331 singing males in 2005 (Holling & RBBP 2008)
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. For 2005, RBBP received reports of 1,331 singing males in 29 counties as far north as Anglesey and Norfolk (Holling & RBBP 2008). 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 widely in Europe since 1990 (PECBMS 2007).
 

Population changes
CES adult abundance graph
 
Table of population changes for Cetti's Warbler

Source Period
(yrs)		 Years Plots
(n)		 Change
(%)		 Lower
limit		 Upper
limit		 Alert Comment
CES adults 5 2001-2006 10 46 -18 192   Small sample
CES juveniles 5 2001-2006 11 56 -3 231   Small sample

 
CES juvenile abundance graph
 

Productivity trends
Productivity information is not currently available for this species
 

Additional information
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This report should be cited as:
Baillie, S.R., Marchant, J.H., Leech, D.I., Joys, A.C., Noble, D.G.,
Barimore, C., Grantham, M.J., Risely, K. & Robinson, R.A. (2009).
Breeding Birds in the Wider Countryside: their conservation status 2008.
BTO Research Report No. 516. BTO, Thetford. (http://www.bto.org/birdtrends)

Pages maintained by Iain Downie, Mandy T Andrews and Laura Smith: Last updated 18.02.2009