Darroch Whitaker, I. Warkentin, K. Hobson, Peter W. Thomas, R. Boardman
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引用次数: 8
摘要
摘要灰颊鸫(Catharus minimus minimus)纽芬兰亚种自20世纪80年代以来数量减少,冬季栖息地的退化可能是其原因之一。然而,这一亚种的冬季活动范围尚不清楚,因此我们在2016年夏季为29只雄性安装了存档的GPS标签。2017年夏天,四只被贴上标签的画眉被重新捕获,尽管所有的标签都丢失了位置,天线也坏了,但检索到的数据显示,一只画眉在哥伦比亚北部的圣玛尔塔内华达山脉(SNSM)过冬,一只在委内瑞拉附近的佩里哈山脉(Sierra de Perija)过冬,第三只可能在同一地区定居。直到4月21日,一个标签提供了位置,整个冬季在1公顷的区域内始终检测到该画眉鸟。在秋季迁徙期间获得的位置表明,画眉鸟通过中美洲和可能直接穿越加勒比海到达南美洲。当代研究表明,SNSM是北方灰颊鸫(C. m. aliciae)重要的迁徙中转站,但一份历史报告与我们的观察相结合,表明冬季SNSM和南美洲北部邻近地区的数量最少,尽管数量可能低于20世纪初。
Fall and Winter Movements of Newfoundland Graycheeked Thrushes (Catharus Minimus Minimus)
Abstract The Newfoundland subspecies of Gray-cheeked Thrush (Catharus minimus minimus) has declined since the 1980s and degradation of winter habitat has been suggested as a contributing stressor. However, the winter range of this subspecies is not well understood, so we fitted 29 males with archival GPS tags during summer 2016. Four tagged thrushes were recaptured in summer 2017 and, though all tags had missing locations and broken antennae, the data retrieved showed that one thrush wintered in the Sierra Nevada de Santa Marta (SNSM) in northern Colombia, one in the nearby Sierra de Perija in Venezuela, and a third may have settled in the same region. One tag provided locations until April 21 and that thrush was consistently detected within a ~1 ha area through the winter. Locations obtained during fall migration indicated that thrushes travelled to South America via Central America and possibly by directly crossing the Caribbean. Contemporary research indicates that the SNSM is an important migratory stopover for Northern Gray-cheeked Thrushes (C. m. aliciae) but a historical report coupled with our observations suggest winter use of the SNSM and adjacent areas in northern South America by C. m. minimus, though numbers may be lower than during the 1900s.