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
PIED WAGTAIL
Motacilla alba
Pied Wagtail © Tommy Holden
 
Conservation listings

Europe: no SPEC category, secure
UK: Green

Long-term trend
UK: uncertain
 
Status summary

Britain and Ireland together hold almost the entire population of the distinctive dark-backed race yarrellii, and so population changes in the UK are of special significance. Results of monitoring conflict somewhat since 1974: CBC/BBS and WBS trends fluctuate in parallel but, whereas little change is evident in the CBC/BBS index over this period, WBS has shown a moderate decline, perhaps suggesting the influence of factors specific to linear waterways. The CBC shows that a strong increase preceded 1974, such that populations have increased overall since 1966. 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). Changes in breeding performance measures have been conflicting and do not help explain the population trends. Although average clutch and brood sizes have declined a little, failure rates at the egg stage (17 days, comprising 13 days incubation and 4 days laying) have also fallen.

 
CBC/BBS UK graph
 
Table of population changes for Pied Wagtail
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC/BBS UK 33 1967-2000 278 89 34 155    
  25 1975-2000 342 -8 -32 21    
  10 1990-2000 681 10 1 25    
  5 1995-2000 1077 7 1 13    
CBC/BBS England 33 1967-2000 216 95 41 179    
  25 1975-2000 265 -10 -31 24    
  10 1990-2000 521 10 -3 28    
  5 1995-2000 822 9 4 16    
WBS waterways 25 1975-2000 66 -48 -59 -35 >25  
  10 1990-2000 69 -15 -26 -2    
  5 1995-2000 69 -12 -20 -3    
BBS UK 8 1994-2002 959 23 15 33    
BBS England 8 1994-2002 728 24 14 35    
BBS Scotland 8 1994-2002 114 30 5 61    
BBS Wales 8 1994-2002 91 0 -21 26    
BBS acknowledgement
 
CBC/BBS England graph
WBS UK graph
BBS UK graph
BBS England graph
BBS Scotland graph
BBS Wales graph
 
Table of productivity information for Pied Wagtail
Variable Period
(yrs)
Years Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Clutch size 33 1968-2001 60 Linear decline 5.12 eggs 4.96 eggs -0.16 eggs  
Brood size 33 1968-2001 113 Curvilinear 4.43 chicks 4.24 chicks -0.19 chicks  
Daily failure rate (eggs) 33 1968-2001 83 Curvilinear 0.0148 nests/day 0.008 nests/day -0.0068 nests/day  
Daily failure rate (chicks) 33 1968-2001 91 None        
Laying date 33 1968-2001 80 None        
 
Clutch size graph
Brood size graph
Egg nest failure graph
Chick nest failure graph
Laying date graph
Insufficient data on CES
available for this species
BTO blue divider
BirdWeb logo, click to go to BirdWeb

BTO Home | JNCC Home
BTO, The Nunnery, Thetford, Norfolk IP24 2PU, UK.
 © British Trust for Ornithology (Registered Charity Number 216652).
Terms and Conditions
| Privacy Statement          Email:


This report should be cited as:
Crick, H.Q.P., Marchant, J.H., Noble, D.G., Baillie, S.R., Balmer, D.E., Beaven, L.P., Coombes, R.H.,
Downie, I.S., Freeman, S.N., Joys, A.C., Leech, D.I., Raven, M.J., Robinson, R.A. and Thewlis, R.M. (2004)
Breeding Birds in the Wider Countryside: their conservation status 2003.
BTO Research Report No. 353. BTO, Thetford. (http://www.bto.org/birdtrends2003)

Pages maintained by Susan Waghorn and Iain Downie: Last updated 16 February, 2009