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BTO Blueline
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BTO Blueline
Phylloscopus collybita
Chiffchaff © Tommy Holden

• Population

• Productivity

• Additional

Conservation listings
Europe: no SPEC category (favourable conservation status in Europe, not concentrated in Europe)
UK: green
Long-term trend
UK, England: shallow increase
UK population size
807,000 territories in 2000 (1988–91 Atlas estimate updated using CBC/BBS trend: BiE04, APEP06)
Status summary
Chiffchaff abundance crashed in the late 1960s/early 1970s in common with that of other trans-Saharan warblers (Siriwardena et al. 1998a). After remaining stable for a decade, the population recovered strongly, and has continued to increase. This recovery is evident from both CBC/BBS and CES data. Climate change may partly explain the strong trend towards earlier laying (Crick & Sparks 1999). Overwinter survival may be the critical factor responsible for changes in abundance, as it is for Whitethroat and Sedge Warbler. Productivity as measured by CES has decreased as the population has risen, but there has been no change in fledglings per breeding attempt or in CES survival. Numbers have shown widespread moderate increase across Europe since 1980 (PECBMS 2010).
CBC/BBS UK graph

1967-2008: 42% (confidence interval 17% to 77%)

Population changes in detail

 Demographic trends

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

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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 23.09.2010