Population overlap and habitat segregation in wintering Black-tailed Godwits Limosa limosa
Population overlap and habitat segregation in wintering Black-tailed Godwits Limosa limosa
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DOI：
10.1080/00063651003678475
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发表时间：
2010-01-01
期刊：
影响因子：
0.7
通讯作者：
Gill, Jennifer A.
中科院分区：
文献类型：
--
作者：
Alves, Jose A.;Lourenco, Pedro M.;Gill, Jennifer A.
迁徙物种的不同繁殖种群可能在空间和时间上重叠，但在栖息地利用模式上有所不同。这对种群监测和保护具有重要意义。目的量化的程度，两个不同的繁殖种群的迁徙滨鸟，黑尾Godwit Limosa limosa，重叠空间，时间和在冬季使用不同的栖息地。方法我们使用1990年和2001年之间的仲冬计数，以确定最重要的网站在伊比利亚的黑尾神。2005-2007年，葡萄牙特茹河口的一个主要地点的河口泥滩和稻田的每月调查，以及对彩色环纹个体的详细跟踪，被用来探索冰岛亚种L的栖息地利用和隔离模式。L. islandica和大陆亚种L. L.豪华轿车。结果1990-2001年1月，伊比利亚平均有66 000多只黑尾白颈长尾雉，其中80%发生在葡萄牙的Tejo和Sado下游盆地，西班牙的Coto Donana和埃布罗三角洲。冰岛黑尾鹬在整个冬季都出现，主要在河口栖息地觅食。大陆黑尾Godwits存在于12月至3月，主要使用稻田。结论伊比利亚支持约30%的冰岛人口在冬季和大部分的大陆人口在春季通过。虽然冰岛人口目前正在增加，但大陆人口正在迅速下降。虽然冰岛godwits使用的河口栖息地在很大程度上保护自然2000网站，栖息地隔离意味着，保护行动的数量减少的大陆godwits应侧重于保护稻田和重建淡水湿地。
Capsule Distinct breeding populations of migratory species may overlap both spatially and temporally, but differ in patterns of habitat use. This has important implications for population monitoring and conservation. Aims To quantify the extent to which two distinct breeding populations of a migratory shorebird, the Black-tailed Godwit Limosa limosa, overlap spatially, temporally and in their use of different habitats during winter. Methods We use mid-winter counts between 1990 and 2001 to identify the most important sites in Iberia for Black-tailed Godwits. Monthly surveys of estuarine mudflats and rice-fields at one major site, the Tejo estuary in Portugal in 2005-2007, together with detailed tracking of colour-ringed individuals, are used to explore patterns of habitat use and segregation of the Icelandic subspecies L. l. islandica and the nominate continental subspecies L. l. limosa. Results In the period 1990-2001, over 66 000 Black-tailed Godwits were counted on average in Iberia during mid-winter (January), of which 80% occurred at just four sites: Tejo and Sado lower basins in Portugal, and Coto Donana and Ebro Delta in Spain. Icelandic Black-tailed Godwits are present throughout the winter and forage primarily in estuarine habitats. Continental Black-tailed Godwits are present from December to March and primarily use rice-fields. Conclusions Iberia supports about 30% of the Icelandic population in winter and most of the continental population during spring passage. While the Icelandic population is currently increasing, the continental population is declining rapidly. Although the estuarine habitats used by Icelandic godwits are largely protected as Natura 2000 sites, the habitat segregation means that conservation actions for the decreasing numbers of continental godwits should focus on protection of rice-fields and re-establishment of freshwater wetlands.