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Hume's whitethroat ''Sylvia althaea'' is a species of typical warbler. Until recently, it was considered conspecific with the lesser whitethroat; today these are seen as members of a superspecies which also includes the desert whitethroat. The present species together with the aridland desert whitethroat(s) seems to form an Asian lineage in the superspecies.〔Del Hoyo, J., Elliot, A., & Christie, D. (editors). (2006). ''Handbook of the Birds of the World''. Volume 11: Old World Flycatchers to Old World Warblers. Lynx Edicions. ISBN 84-96553-06-X.〕〔Helbig, A. J. (2001). The characteristics of the genus: Phylogeny and biogeography of the genus ''Sylvia''. Pages 24–28 in: Shirihai, H., Gargallo, G., Helbig, A. J., & Harris, A. ''Sylvia Warblers''. Helm Identification Guides ISBN 0-7136-3984-9〕〔Jønsson, K. A., & Fjeldså, J. (2006). A phylogenetic supertree of oscine passerine birds (Aves: Passeri). ''Zool. Scripta'' 35 (2): 149–186. (HTML abstract).〕 It is distinguished from the lesser whitethroat by its slightly larger size (13–14 cm), slightly stouter bill, and the darker top of the head and darker grey-brown back, which gives it less contrast between its upper head to back region than in lesser whitethroat. The throat is white, and the rest of the underparts pale greyish-white. Their breeding ranges do not overlap; Hume's whitethroat inhabits upland regions from eastern Iran eastwards to the Tian Shan mountains of central Asia and the western ranges of the Himalaya. Hume's whitethroat breeds at altitudes of 2,000–3,600 m in open scrub, often with juniper, and in cultivated areas such as almond orchards. It migrates south to southern Pakistan and India in the winter, where it does overlap with wintering lesser whitethroats in some areas.〔〔Svensson, L., Mullarney, K. & Zetterström, D. (2009). ''Collins Bird Guide'', second edition. HarperCollins, London ISBN 978-0-00-726726-2.〕 Two subspecies are accepted:〔(IOC World Bird List )〕 * ''Sylvia althaea althaea'' – mountains of southwestern Asia. * ''Sylvia althaea monticola'' – Alai, Pamir and Tian Shan mountains, in central Asia. Birds breeding in the Caucasus Mountains and northwestern Iran have sometimes been considered intermediate between lesser and Hume's whitethroats,〔Snow, D. W., Perrins, C. M., Doherty, P., & Cramp, S. (1998). ''The complete birds of the western Palaearctic on CD-ROM''. Oxford University Press. ISBN 0-19-268579-1〕 but are now more clearly assigned to lesser whitethroat, as the subspecies ''Sylvia curruca caucasica''〔 or even not separated from typical European ''S. c. curruca''.〔 The name commemorates the British naturalist Allan Octavian Hume who worked in India. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hume's whitethroat」の詳細全文を読む スポンサード リンク
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