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BTO Blueline
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BTO Blueline
Motacilla alba
Pied Wagtail © Tommy Holden

• Population

• Productivity

• Additional

Conservation listings
Europe: no SPEC category (favourable conservation status in Europe, not concentrated in Europe)
UK: green (species level); amber (race yarrellii, >20% of European breeders)
Long-term trend
UK: uncertain
UK population size
272,000–352,000 territories in 2000 (1988–91 Atlas estimate updated using CBC/BBS and WBS trends: BiE04, APEP06)
Status summary
Britain and Ireland together hold almost the entire population of the distinctive dark-backed race yarrellii, and for this reason population changes in the UK are of global conservation significance. The CBC shows that a strong increase occurred up to the mid 1970s, such that populations have shown moderate increase overall since 1966. Since 1974, however, the results of monitoring are somewhat conflicting: CBC/BBS and WBS/WBBS trends fluctuate in parallel but, whereas little overall change is evident in the CBC/BBS index, WBS/WBBS has shown a moderate decline, perhaps suggesting the influence of factors specific to linear waterways. The long-term trend in abundance is similar to those shown by Wren and Long-tailed Tit, two other resident insectivores (Siriwardena et al. 1998a). Average clutch and brood sizes have declined a little, raising NRS concern (Leech & Barimore 2008), but this has been counteracted by a large fall in nest failure rates. The number of fledglings per breeding attempt has shown a strong linear increase.
CBC/BBS UK graph

1967-2008: 72% (confidence interval 27% to 157%)

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 10.09.2010