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LC
Marmora's Warbler Sylvia sarda

Justification
This species has a very large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is very large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Taxonomic source(s)
Cramp, S.; Perrins, C. M. 1977-1994. Handbook of the birds of Europe, the Middle East and Africa. The birds of the western Palearctic. Oxford University Press, Oxford.

Taxonomic note
Sylvia balearica has been split from S. sarda on the basis of size, shape (structure), coloration, song, calls, migratory behaviour and mitochondrial DNA (Shirihai et al. 2001, Baerlein et al. 2006). However, the size and structural differences are negligible, the colour differences are minor, the vocal differences are not particularly strong (and not properly assessed or presented), the migratory behaviour is difficult to evaluate taxonomically, and the molecular evidence remains unpublished after at least six years. Therefore this split is not accepted until better evidence is provided.

Population justification
The breeding population, which is confined to Europe, is estimated to number 29,000-75,000 breeding pairs, equating to 87,000-225,000 individuals (BirdLife International 2004).

Trend justification
The population is suspected to be stable in the absence of evidence for any current declines or substantial threats.

Related state of the world's birds case studies

References
BirdLife International. 2004. Birds in Europe: population estimates, trends and conservation status. BirdLife International, Cambridge, U.K.

Further web sources of information
Detailed species account from Birds in Europe: population estimates trends and conservation status (BirdLife International 2004)

Detailed species account from Birds in Europe: population estimates, trends and conservation status (BirdLife International 2004)

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Text account compilers
Ekstrom, J., Butchart, S.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2014) Species factsheet: Sylvia sarda. Downloaded from http://www.birdlife.org on 21/09/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 21/09/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Least Concern
Family Sylviidae (Old World warblers)
Species name author Temminck, 1820
Population size mature individuals
Population trend Stable
Distribution size (breeding/resident) 37,600 km2
Country endemic? No
Links to further information
- Additional Information on this species