Red Knots (Calidris canutus piersmai and C. c. rogersi) depend on a small threatened staging area in Bohai Bay, China
Red Knots (Calidris canutus piersmai and C. c. rogersi) depend on a small threatened staging area in Bohai Bay, China
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DOI：
10.1071/mu10024
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发表时间：
2010-12
期刊：
影响因子：
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通讯作者：
D. Rogers;Hong-yan Yang;C. Hassell;A. Boyle;K. Rogers;Bing Chen;Zhengwang Zhang;T. Piersma
中科院分区：
文献类型：
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作者：
D. Rogers;Hong-yan Yang;C. Hassell;A. Boyle;K. Rogers;Bing Chen;Zhengwang Zhang;T. Piersma
摘要对中国渤海湾(39°02‘N，118°15’E)赤结向北迁徙的分期进行了监测。结被鉴定为亚种，我们系统地搜索非繁殖地的彩带鸟类。我们模拟了迁徙的周转率，并使用最近公布的非繁殖地的统计数据修正了飞行种群的估计。在我们的研究地点出现了两个俄罗斯繁殖亚种：C.C.rogersi(迁徙到楚科塔)和C.C.piersmai(迁徙到新西伯利亚群岛)；它们共同出现在澳大利亚和新西兰的非繁殖地，但在迁徙的时间上有明显的差异。我们保守地估计，我们的研究地点只有20公里长的海岸线，使用了超过45%的世界成年罗格尔西和皮尔斯迈成年种群-这一结论得到了来自澳大利亚西北部和新西兰的彩带鸟类重视频率的独立数据的支持。这一重要集结区的大部分现在正被曹妃甸工业区的建设和更西边的开发所摧毁，这些开发只包括该地区许多潮滩填海工程中的一部分。保护渤海湾剩余的潮滩对于保护东亚-澳大拉西亚航道的红结是必不可少的。
Abstract We monitored numbers of Red Knots (Calidris canutus) staging in Bohai Bay, China (39°02'N, 118°15'E) on northward migration. Knots were identified to subspecies, and we systematically searched for colour-banded birds from the non-breeding grounds. We modelled migratory turnover, and revised estimates of flyway population using recently published counts from the non-breeding grounds. Two Russian-breeding subspecies occurred at our study site: C. c. rogersi (migrating to Chukotka), and C. c. piersmai (migrating to the New Siberian Islands); they co-occur on non-breeding grounds in Australia and New Zealand, but differ markedly in timing of migration. We conservatively estimate that our study site, comprising only 20 km of coastline, was used by over 45% of the combined world population of adult C. c. rogersi and C. c. piersmai—a conclusion supported by the independent data on frequency of resighting of colour-banded birds from north-western Australia and New Zealand. Much of this vital staging area is now being destroyed through construction of the Caofedian Industrial Zone and more westerly developments, which comprise only some of the many tidal flat ‘reclamation’ projects in the region. Preservation of the remaining tidal flats of Bohai Bay is essential to the conservation of Red Knots in the East Asian-Australasian Flyway.