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YELLOW WAGTAIL Motacilla flava
 
Conservation Listings Long term trend

Unlisted/Green
Biodiversity Steering Group
Conservation Concern List

UK: Probable decline
Waterways: Rapid decline
 
Status Summary
Yellow Wagtails appear to have been in decline since the early 1980s, but the reduction in the CBC index is not significant and that in the WBS index may not be representative of the population as a whole. Gibbons et al. (1993) identified a concurrent range contraction towards a core area in central England. BBS results suggest that the decline is continuing; farmland drainage and the conversion of pasture to arable land have been cited as potential causes (Gibbons et al. 1993). Although sample sizes are small, there has been a significant reduction in brood size over the past 30 years.
 
 
Table of population changes for Yellow Wagtail
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC all habitats 30 1968-1998 27 -40 -70 36    
  25 1973-1998 26 -25 -63 60    
  10 1988-1998 19 -20 -51 8   Small sample
  5 1993-1998 17 19 -20 55   Small sample
WBS waterways 23 1975-1998 22 -81 -94 -70 >50  
  10 1988-1998 18 -68 -83 -55 >50 Small sample
  5 1993-1998 17 -46 -65 -26 >25 Small sample
BBS UK 5 1994-1999 155 -29 -41 -14 (>25)  
BBS England 5 1994-1999 153 -27 -39 -12 (>25)  
The Breeding Bird Survey is jointly funded by BTO, JNCC and RSPB
 
 
Table of productivity information for Yellow Wagtail
Variable Period
(yrs)
Years Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Brood size 30 1968-1998 13 Linear decline 4.85 chicks 4.4 chicks -0.45 chicks Small sample
 
Insufficient data on clutch size
available for this species

 

Insufficient data on nest failure
available for this species

 

 

Insufficient data on nestling failure available for this species

 

Insufficient data on laying date
available for this species
Insufficient data on CES
available for this species
   




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Last updated: 7 February, 2001

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