Population history and genetic structure of a circumpolar species:: the arctic fox
Population history and genetic structure of a circumpolar species:: the arctic fox
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DOI：
10.1111/j.1095-8312.2005.00415.x
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发表时间：
2005-01-01
影响因子：
1.9
通讯作者：
Angerbjörn, A
中科院分区：
文献类型：
--
作者：
Dalén, L;Fuglei, E;Angerbjörn, A
极地极地狐狸Alopex lagopus在寒冷的气候中茁壮成长，有很高的迁移率，需要进行长距离的迁徙。因此，它不同于许多温带分类群，它们在冰河时代受到冰川避难所的周期性限制。我们通过线粒体控制区变异研究了191只北极狐的种群历史和遗传结构。一些单倍型具有全北极分布，没有发现系统地理结构。此外，居住在冰川区和非冰川区的种群之间的单倍型多样性没有差异。这表明目前在研究人群中的基因流动，除了冰岛的人群，冰岛被全年开放的水域包围。北极狐通常被分为两种生态型：旅鼠和沿海狐狸。分子变异分析表明，‘旅鼠’生态型种群之间的基因流动特别高。这可能是由于它们较高的迁移率和不同生态型之间的迁徙适应性降低所致。失配分析表明，种群规模在118000 BP左右突然扩大，与上一次间冰期重合。我们认为，冰川周期对北极狐的影响与其对温带物种的影响相反，间冰期导致北极狐狸在北部避难所短期隔离。(C)2005年伦敦林尼安协会。
The circumpolar arctic fox Alopex lagopus thrives in cold climates and has a high migration rate involving long-distance movements. Thus, it differs from many temperate taxa that were subjected to cyclical restriction in glacial refugia during the Ice Ages. We investigated population history and genetic structure through mitochondrial control region variation in 191 arctic foxes from throughout the arctic. Several haplotypes had a Holarctic distribution and no phylogeographical structure was found. Furthermore, there was no difference in haplotype diversity between populations inhabiting previously glaciated and unglaciated regions. This suggests current gene flow among the studied populations, with the exception of those in Iceland, which is surrounded by year-round open water. Arctic foxes have often been separated into two ecotypes: 'lemming' and 'coastal'. An analysis of molecular variance suggested particularly high gene flow among populations of the 'lemming' ecotype. This could be explained by their higher migration rate and reduced fitness in migrants between ecotypes. A mismatch analysis indicated a sudden expansion in population size around 118 000 BP, which coincides with the last interglacial. We propose that glacial cycles affected the arctic fox in a way opposite to their effect on temperate species, with interglacials leading to short-term isolation in northern refugia. (C) 2005 The Linnean Society of London.