BTO - Breeding Birds of the Wider Countryside

WOOD WARBLER
Phylloscopus sibilatrix

Conservation listings

Unlisted/Green
Biodiversity Steering Group Conservation Concern List

Long-term trend

UK: Unknown

Status summary

Wood Warblers have a westernly distribution in Britain and were not monitored well before the inception of the BBS. The species' range varied little between the two breeding atlas projects (Gibbons et al. 1993) and little change has been apparent at the few CBC plots on which the species occurs (Crick et al. 1998). In addition, no significant trends in breeding performance have been observed. The BBS shows a significant decline since 1994 that should be monitored carefully to assess the need for conservation action.

Table of population changes for Wood Warbler

Source Period
(yrs) Years Plots
(n) Change
(%) Lower
limit Upper
limit Alert Comment

BBS UK 6 1994-2000 58 -43 -58 -24 (>25)

BBS England 6 1994-2000 27 -69 -80 -51 (>50) Small sample

BBS Wales 6 1994-2000 23 22 -25 98 Small sample

The Breeding Bird Survey is jointly funded by BTO, JNCC and RSPB

Table of productivity information

Variable Period
(yrs) Years Mean
annual
sample Trend Predicted
in first year Predicted
in last year Change Comment

Clutch size 31 1968-1999 18 None Small sample

Brood size 31 1968-1999 39 None

Daily failure rate (eggs) 31 1968-1999 22 None Small sample

Daily failure rate (chicks) 31 1968-1999 28 None Small sample

Laying date 31 1968-1999 33 None

Insufficient data on CES
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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