BTO - Breeding Birds of the Wider Countryside: Appendix 7.4a

BBWC Home > Contents > Appendix > Tables of population declines or increases from BBS

7.1

Tables of population declines or increases from BBS

BBS - UK - population increases of >50%

BBS - England - population increases of >50%

BBS - Scotland - population increases of >50%

BBS - Wales - population increases of >50%

BBS - Northern Ireland - population increases of >50%

Table of declines >25% for BBS UK 1994-2003

Species	Period (yrs)	Plots (n)	Change (%)	Lower limit	Upper limit	Alert	Comment
Wood Warbler	9	54	-68	-78	-55	(>50)
Willow Tit	9	54	-55	-68	-37	(>50)
Sand Martin	9	96	-46	-59	-29	(>25)
Turtle Dove	9	184	-44	-53	-33	(>25)
Pied Flycatcher	9	41	-43	-59	-20	(>25)
Spotted Flycatcher	9	190	-42	-51	-31	(>25)
Shelduck	9	114	-39	-49	-26	(>25)
Grey Partridge	9	210	-39	-49	-27	(>25)
Lesser Whitethroat	9	202	-39	-48	-27	(>25)
Cuckoo	9	707	-36	-41	-30	(>25)
Corn Bunting	9	139	-35	-45	-22	(>25)
Siskin	9	112	-33	-46	-16	(>25)
Tawny Owl	9	76	-32	-49	-10	(>25)	Nocturnal species
Great Crested Grebe	9	56	-28	-47	-1	(>25)
Swift	9	852	-28	-34	-22	(>25)
Starling	9	1469	-28	-33	-23	(>25)
Curlew	9	429	-27	-33	-21	(>25)

This table does not use formal alerts methods due to the small number of years of data.
Population changes are based on an annual population index with no smoothing or truncation of end points.

Table of declines >25% for BBS England 1994-2003

Species	Period (yrs)	Plots (n)	Change (%)	Lower limit	Upper limit	Alert	Comment
Willow Tit	9	48	-62	-74	-45	(>50)
Lesser Redpoll	9	47	-51	-67	-26	(>50)
Cuckoo	9	572	-48	-53	-43	(>25)
Turtle Dove	9	181	-44	-54	-33	(>25)
Lesser Whitethroat	9	193	-39	-49	-27	(>25)
Spotted Flycatcher	9	139	-38	-49	-24	(>25)
Willow Warbler	9	823	-37	-41	-33	(>25)
Starling	9	1210	-36	-40	-31	(>25)
Great Crested Grebe	9	49	-33	-51	-7	(>25)
Grey Partridge	9	184	-32	-43	-19	(>25)
Corn Bunting	9	132	-31	-42	-18	(>25)
Swift	9	737	-29	-35	-23	(>25)
Sand Martin	9	64	-29	-47	-5	(>25)
Tree Pipit	9	63	-26	-43	-4	(>25)

This table does not use formal alerts methods due to the small number of years of data.
Population changes are based on an annual population index with no smoothing or truncation of end points.

Table of declines >25% for BBS Scotland 1994-2003

Species	Period (yrs)	Plots (n)	Change (%)	Lower limit	Upper limit	Alert	Comment
Swift	9	40	-62	-74	-44	(>50)
Lapwing	9	84	-42	-53	-28	(>25)
Siskin	9	56	-40	-58	-16	(>25)
Curlew	9	120	-36	-45	-25	(>25)
Hooded Crow	9	50	-36	-53	-13	(>25)

This table does not use formal alerts methods due to the small number of years of data.
Population changes are based on an annual population index with no smoothing or truncation of end points.

Table of declines >25% for BBS Wales 1994-2003

Species	Period (yrs)	Plots (n)	Change (%)	Lower limit	Upper limit	Alert	Comment
Starling	9	78	-62	-72	-49	(>50)
Cuckoo	9	54	-49	-63	-28	(>25)
Tree Pipit	9	30	-45	-64	-15	(>25)
Yellowhammer	9	37	-39	-56	-16	(>25)
Mallard	9	53	-37	-54	-13	(>25)
Willow Warbler	9	136	-34	-42	-25	(>25)
Garden Warbler	9	51	-29	-48	-3	(>25)
Bullfinch	9	49	-28	-48	-1	(>25)
Coal Tit	9	60	-27	-45	-4	(>25)

This table does not use formal alerts methods due to the small number of years of data.
Population changes are based on an annual population index with no smoothing or truncation of end points.

Appendix 7.4 continued


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This report should be cited as: Baillie, S.R., Marchant, J.H., Crick, H.Q.P., Noble, D.G., Balmer, D.E., Beaven, L.P., Coombes, R.H., Downie, I.S., Freeman, S.N., Joys, A.C., Leech, D.I., Raven, M.J., Robinson, R.A. and Thewlis, R.M. (2005) Breeding Birds in the Wider Countryside: their conservation status 2004. BTO Research Report No. 385. BTO, Thetford. (http://www.bto.org/birdtrends) Pages maintained by Susan Waghorn and Iain Downie: Last updated 18 January, 2006