The British Trust for Ornithology
NIGHTJAR
Caprimulgus europaeus

Nightjar © Derek Belsey
 
Conservation Listings

Table 2/Red (>=50% Distribution decline)
Biodiversity Steering Group Priority Species List
Long term trend
UK: Increase 
 
Status Summary
Having suffered a decline in range of more than 50% between breeding atlases, the 1992 national survey revealed a welcome increase of 50% in population size since 1981, probably due to increased availability of young forest habitat as plantations have been felled and replanted (Morris et al. 1994). The apparent increase in nest failure rates at the chick stage are probably an artefact of very small sample sizes in the early years. (Nest Record Scheme data for 1996-99 will soon be added to this dataset.)
 
Annual breeding population estimates for this species
are not currently monitored by BTO
Table of productivity information for Nightjar
Variable Period
(yrs)		 Years Mean
annual
sample		 Trend Predicted
in first year		 Predicted
in last year		 Change Comment
Clutch size 27 1968-1995 16 Linear decline 1.99 eggs 1.91 eggs -0.08 eggs Small sample
Brood size 27 1968-1995 24 None       Small sample
Daily failure rate (eggs) 27 1968-1995 20 None       Small sample
Daily failure rate (chicks) 27 1968-1995 20 Linear increase 0.0019 nests/day 0.0167 nests/day 0.0148 nests/day Small sample
Laying date 27 1968-1995 18 None       Small sample
 

 

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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