Australia's arid-adapted butcherbirds experienced range expansions during Pleistocene glacial maxima
Australia's arid-adapted butcherbirds experienced range expansions during Pleistocene glacial maxima
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DOI：
10.1038/ncomms4994
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发表时间：
2014-05-01
影响因子：
16.6
通讯作者：
Cook, Lyn G.
中科院分区：
文献类型：
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作者：
Kearns, Anna M.;Joseph, Leo;Cook, Lyn G.
在北半球，普遍接受的是一种冰期极大期冷适应物种活动范围扩大的模式。考虑到澳大利亚的转基因在很大程度上导致了干旱地区的扩张，而不是冰川作用，可以预期，干旱适应物种可能在转基因地区扩大了活动范围，就像北半球的冷适应物种一样。然而，对于澳大利亚的生物群来说，干旱适应物种在转基因下收缩为避难所仍然是典型的。在这里，我们使用多位点数据和生态位模型（ENMs）来测试屠宰鸟的替代转基因模型。ENMs、mtDNA以及对核渗透和过去种群规模的估计都支持了一种模型，即在耐旱的灰牛头鸟身上进行转基因扩张，从而与它的近亲——生活在稀树草原的银背牛头鸟——产生了二次接触，后者的当代分布范围很广。总之，这些数据否定了对澳大利亚干旱林地和干旱生物群普遍使用转基因收缩模型。
A model of range expansions during glacial maxima (GM) for cold-adapted species is generally accepted for the Northern Hemisphere. Given that GM in Australia largely resulted in the expansion of arid zones, rather than glaciation, it could be expected that arid-adapted species might have had expanded ranges at GM, as cold-adapted species did in the Northern Hemisphere. For Australian biota, however, it remains paradigmatic that arid-adapted species contracted to refugia at GM. Here we use multilocus data and ecological niche models (ENMs) to test alternative GM models for butcherbirds. ENMs, mtDNA and estimates of nuclear introgression and past population sizes support a model of GM expansion in the arid-tolerant Grey Butcherbird that resulted in secondary contact with its close relative-the savanna-inhabiting Silver-backed Butcherbird-whose contemporary distribution is widely separated. Together, these data reject the universal use of a GM contraction model for Australia's dry woodland and arid biota.