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BTO Blueline
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BTO Blueline
Turdus merula
Blackbird © Tommy Holden

• Population

• Productivity

• Additional

Conservation listings
Europe: no SPEC category (concentrated in Europe, conservation status favourable)
UK: green
Long-term trend 
UK, England: shallow decline

UK population size

4,935,000 territories in 2000 (1988–91 Atlas estimate updated using CBC/BBS trend: BiE04, APEP06)
Status summary
Both CBC/BBS and CES data show long-term declines in Blackbird abundance, but recent increases indicate that the population has begun to recover. The moderate-decline criteria for amber listing and for BTO alerts are no longer met, and the species has been listed in the green category since 2002. CBC results show that the decline began in the mid 1970s. It is likely that reduced survival drove the decline (Siriwardena et al. 1998a), although there has been no change in survival as recorded by CES since 1983. Fleglings per breeding attempt also show no change. Agricultural intensification is likely to have contributed (Fuller et al. 1995), but, since numbers fell in woodland as well as farmland, additional factors probably operated.
CBC/BBS UK graph

1967-2007: -14% (confidence interval -21% to -3%)

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., Joys, A.C., Noble, D.G., Barimore, C., Downie, I.S., Grantham, M.J., Risely, K. & Robinson, R.A. (2010). Breeding Birds in the Wider Countryside: their conservation status 2009.
BTO Research Report No. 541. BTO, Thetford. (http://www.bto.org/birdtrends)

Pages maintained by Iain Downie, Mandy T Andrews and Laura Smith: Last updated 19.02.2010