Contents of report
Breeding Bird Survey
Common Birds Census
Constant Effort Sites
Nest Record Scheme
Waterways Bird Survey
Alerts
Summary
What the categories mean
Return to BTO Home Page
.
WOODLARK Lullula arborea
 
Conservation Listings Long term trend

Table 2/Red
(>=50% Distribution decline)
Biodiversity Steering Group
Priority Species List

UK: Increase

 
Status Summary
Sitters et al. (1996) report that the population of this rare breeding bird has increased from c.250 pairs in 1986 to c.600 pairs in 1993, probably helped by recent mild winters and increased habitat availability due to forest storm damage, forest restocking, and heathland management. A national survey in 1997 showed that the population had increased further to c.1550 pairs (Wotton & Gillings 2000; see http://www.bto.org/research/archive/arch3.htm). Strong trends are not generally evident in breeding performance, although failure rates at the egg stage (17 days, comprising 14 days incubation + 3 days laying) have declined from 45% to 20% between 1975 and 1998 (extrapolation before 1975 is not reliable because of paucity of data).
 
Annual breeding population changes for this species
are not currently monitored by BTO
Table of productivity information for Woodlark
Variable Period
(yrs)
Years Mean
annual
sample
Trend Predicted
in first year
Predicted
in last year
Change Comment
Clutch size 30 1968-1998 14 None       Small sample
Brood size 30 1968-1998 22 None       Small sample
Daily failure rate (eggs) 30 1968-1998 16 Linear decline 0.047 nests/day 0.0127 nests/day -0.0343 nests/day Small sample
Daily failure rate (chicks) 30 1968-1998 22 Curvilinear 0.0537 nests/day 0.0374 nests/day -0.0163 nests/day Small sample
Laying date 30 1968-1998 15 None       Small sample
 

 

Insufficient data on CES
available for this species

 

 

   



The report should be cited as: Baillie, S.R., Crick, H.Q.P., Balmer, D.E., Bashford, R.I., Beaven, L.P., Freeman, S.N., Marchant, J.H., Noble, D.G., Raven, M.J., Siriwardena, G.M., Thewlis, R. and Wernham, C.V. (2001) Breeding Birds in the Wider Countryside: their conservation status 2000. BTO Research Report No. 252. BTO, Thetford. (http://www.bto.org/birdtrends)

[ Welcome | Contents | Introduction | CBC | WBS | BBS | Heronries | CES | NRS | Alerts ]
[ Summary | Discussion | References | Help | BTO Home Page ]

© British Trust for Ornithology
BTO, The Nunnery, Thetford, Norfolk IP24 2PU
Tel: (+44) (0) 1842 750050 Fax: (+44) (0) 1842 750030 Email:

Last updated: 17 April, 2001

Page created by Susan Waghorn