BTO - Breeding Birds of the Wider Countryside

GARDEN WARBLER
Sylvia borin

Conservation listings

Europe: no SPEC category (concentrated in Europe, conservation status favourable)
UK: Green

Long-term trend

UK, England: fluctuating, with no long-term trend

Distribution maps

Maps and statistics from British and Irish
atlases can be viewed here.

Status summary

Garden Warbler abundance has varied alongside that of other trans-Saharan migrant warblers (Siriwardena et al. 1998b), probably reflecting the influence of changes in their winter environment. Despite large short-term fluctuations in abundance, and a current downturn, the CBC/BBS and CES both suggest long-term population stability. Productivity, as measured by the CES, has declined since 1983.

Table of population changes for Garden Warbler

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

CBC/BBS UK 35 1967-2002 167 -21 -46 29

25 1977-2002 207 33 -1 104

10 1992-2002 382 -13 -22 1

5 1997-2002 484 -21 -26 -14

CBC/BBS England 35 1967-2002 143 -22 -49 16

25 1977-2002 176 22 -6 80

10 1992-2002 318 -14 -22 -4

5 1997-2002 399 -22 -27 -15

CES adults 18 1984-2002 64 -21 . .

10 1992-2002 75 -20 . .

5 1997-2002 72 -25 . .

CES juveniles 18 1984-2002 63 -46 . . [>25*]

10 1992-2002 73 -38 . . [>25*]

5 1997-2002 69 -35 . . [>25*]

BBS UK 9 1994-2003 366 -17 -27 -6

BBS England 9 1994-2003 298 -21 -31 -9

BBS Wales 9 1994-2003 51 -29 -48 -3 (>25)

Table of productivity information

Variable	Period (yrs)	Years	Mean annual sample	Trend	Predicted in first year	Predicted in last year	Change	Comment
Clutch size	34	1968-2002	16	None				Small sample
Brood size	34	1968-2002	25	None				Small sample
Daily failure rate (eggs)	34	1968-2002	22	None				Small sample
Daily failure rate (chicks)	34	1968-2002	19	None				Small sample
Laying date	34	1968-2002	21	None				Small sample
Percentage juveniles (CES)	18	1984-2002	77	Smoothed trend	185 productivity index	102 productivity index	-46%[>25]
Percentage juveniles (CES)	10	1992-2002	88	Smoothed trend	149 productivity index	102 productivity index	-33%[>25]
Percentage juveniles (CES)	5	1997-2002	84	Smoothed trend	126 productivity index	102 productivity index	-20%


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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