Streaked Reed Warbler
Acrocephalus sorghophilus
A mysterious and secretive reed warbler; formerly fairly common but now increasingly rare and possibly near extinction. The only Asian reed warbler with a streaked crown and back. Adults bear a passing resemblance to the much more common Black-browed Reed Warbler but have prominent striping all along the back and crown, a less contrasting brow pattern, and are noticeably paler in color. Recorded in marshes and wet fields on passage and during the winter, but breeding grounds remain unknown. Gives a rattling, grating song akin to a Oriental Reed Warbler, but reportedly quieter.
识别特征
EBird describes the bird as "A mysterious and secretive reed warbler; formerly fairly common but now increasingly rare and possibly near extinction. The only Asian reed warbler with a streaked crown and back. Adults bear a passing resemblance to the much more common Black-browed Reed Warbler but have prominent striping all along the back and crown, a less contrasting brow pattern, and are noticeably paler in color. Recorded in marshes and wet fields on passage and during the winter, but breeding grounds remain unknown. Gives a rattling, grating song akin to an Oriental Reed Warbler, but reportedly quieter."
分类信息
- 学名
- Acrocephalus sorghophilus
- 命名信息
- (Swinhoe, 1863)
- 目
- Passeriformes
- 科
- Acrocephalidae
- 属
- Acrocephalus
分布与栖息地
On passage, it has been recorded in marshland and millet crops, and it occurs near the water in reed and grass marshes in the winter. It possibly uses willow scrub and reedbeds in its breeding range. It probably feeds largely on invertebrates and may consume seeds but more research is needed. Spring passage in China is from late May to early June, with autumn passage from late August to early September. All Philippine records are from September to June.<p>IUCN has assessed this bird as critically endangered with the population estimated at just 250 to 999 mature individuals and continuing to decline. This species' main threat is habitat loss with wholesale clearance of wetland habitats particularly the only known wintering ground in Candaba Swamp which has been converted into agricultural lands, particularly for rice. <p>The Candaba Swamp is a Ramsar site; however, habitat conversion and hunting still continues.<p>Conservation actions proposed include attempting to locate the breeding areas in China and Russia; surveying wetlands in the Philippines to try and locate further wintering sites; and initiating a new ringing programme at Dalton Pass and other migrant trapping locations. Investigation of the potential for stable isotope analysis of museum specimens could identify areas in which the species breeds. Finally, it should be listed as a protected species in China.
- 繁殖区
- PAL : ne China
- 非繁殖区
- se China, Philippines (rare)
- 迁徙
- Complete migrants
保护状况
- 种群趋势
- declining
照片
分布
其他鸟类
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