BTO - Breeding Birds of the Wider Countryside

GARDEN WARBLER
Sylvia borin

• Population
changes

• Productivity
trends

• Additional
information

Conservation listings

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

Long-term trend

UK, England: probable shallow decline

UK population size

190,000 territories in 2000 (1988–91 Atlas estimate updated using CBC/BBS trend: BiE04, APEP06)

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, the CBC/BBS and CES both suggest that the population may be in long-term decline. There has been no change in fledglings per breeding attempt or in CES survival rates, but post-fledging productivity, as measured by the CES, has declined sharply since 1983. Numbers have shown widespread shallow decline across Europe since 1980 (PECBMS 2010).

1967-2008: -16% (confidence interval -43% to 28%)

Population changes in detail

Table of population changes for Garden Warbler

Source	Period (yrs)	Years	Plots (n)	Change (%)	Lower limit	Upper limit
CBC/BBS UK	41	1967-2008	211	-16	-43	28
	25	1983-2008	298	4	-18	32
	10	1998-2008	471	-15	-24	-5
	5	2003-2008	461	7	-3	18
CBC/BBS England	41	1967-2008	179	-22	-50	19
	25	1983-2008	249	-7	-26	22
	10	1998-2008	389	-22	-30	-15
	5	2003-2008	382	3	-5	12
CES adults	24	1984-2008	64	-8	-36	38
	10	1998-2008	68	-17	-30	-4
	5	2003-2008	62	15	1	31
CES juveniles	24	1984-2008	64	-34	-57	15
	10	1998-2008	68	-22	-39	-1
	5	2003-2008	64	7	-13	31
BBS UK	13	1995-2008	423	-13	-23	0
	10	1998-2008	444	-14	-23	-4
	5	2003-2008	461	7	-3	18
BBS England	13	1995-2008	348	-19	-27	-9
	10	1998-2008	363	-22	-30	-14
	5	2003-2008	379	2	-7	12
BBS Wales	13	1995-2008	54	-21	-44	7
	10	1998-2008	58	-16	-36	10
	5	2003-2008	57	12	-11	38

Demographic trends

More on demographic trends

Additional information


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This report should be cited as: Baillie, S.R., Marchant, J.H., Leech, D.I., Renwick, A.R., Joys, A.C., Noble, D.G., Barimore, C., Conway, G.J., Downie, I.S., Risely, K. & Robinson, R.A. (2010). Breeding Birds in the Wider Countryside: their conservation status 2010. BTO Research Report No. 565. BTO, Thetford. (http://www.bto.org/birdtrends) Pages maintained by Iain Downie, Mandy T Andrews and Laura Smith: Last updated 05.10.2010