The British Trust for Ornithology
WILLOW TIT
Parus montanus
Willow Tit © Rob Robinson
Conservation listings

Table 4/Amber (25-49% Population decline)
Biodiversity Steering Group Conservation Concern List

Long-term trend
UK: Rapid decline
Status summary
Willow Tits have been in decline since the mid-1970s and the continuing decline in the CBC index through the 1990s, following a brief period of stability during the late 1980s, is replicated in the trend in abundance calculated from CES data. The decline is unlikely to be due to nest predation and has only occurred in woodland and farmland, not in the wet woodland habitats preferred by the species (G.M. Siriwardena, unpubl.). Candidate causes for the decline include reductions in the availability of dead wood, woodland drainage and reductions in woodland shrub layer density (Vanhinsbergh et al. 2001).
 
 
Table of population changes for Willow Tit
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC all habitats 31 1968-1999 31 -76 -90 -61 >50  
  25 1974-1999 30 -80 -91 -66 >50  
  10 1989-1999 18 -64 -82 -46 >50 Small sample
  5 1994-1999 17 -43 -60 -29 >25 Small sample
CES adults 15 1984-1999 25 -40 . . [>25]  
  10 1989-1999 28 -51 . . [>50]  
  5 1994-1999 28 -41 . . [>25]  
CES juveniles 15 1984-1999 35 -31 . . [>25]  
  10 1989-1999 40 -49 . . [>25*]  
  5 1994-1999 38 -32 . . [>25]  
BBS UK 6 1994-2000 59 -54 -67 -35 (>50)  
BBS England 6 1994-2000 52 -49 -64 -27 (>25)  
The Breeding Bird Survey is jointly funded by BTO, JNCC and RSPB
 
 
Table of productivity information for Willow Tit
Variable Period
(yrs)
Years Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Percentage juveniles (CES) 15 1984-1999 40 Smoothed trend 122 productivity index 100 productivity index -18%  
Percentage juveniles (CES) 10 1989-1999 44 Smoothed trend 114 productivity index 100 productivity index -12%  
Percentage juveniles (CES) 5 1994-1999 42 Smoothed trend 99 productivity index 100 productivity index 1%  
 

 

Insufficient data on clutch size
available for this species

 

 

Insufficient data on brood 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




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This report should be cited as:
Baillie, S.R., Crick, H.Q.P., Balmer, D.E., Beaven, L.P., Downie, I.S., Freeman, S.N., Leech, D.I., Marchant, J.H.,
Noble, D.G., Raven, M.J., Simpkin, A.P., Thewlis, R.M. and Wernham, C.V.
(2002) Breeding Birds in the Wider
Countryside: their conservation status 2001. BTO Research Report No. 278. BTO, Thetford. (http://www.bto.org/birdtrends)

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