The first record of a trans-oceanic sister-group relationship between obligate vertebrate troglobites.

The first record of a trans-oceanic sister-group relationship between obligate vertebrate troglobites.
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DOI:
10.1371/journal.pone.0044083
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Sparks JS
Sparks JS
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Chakrabarty P;Davis MP;Sparks JS

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我们使用物种最丰富的脊椎动物目(Gobiiformes)的最完整的系统发育,并从丰富的硬骨鱼化石记录中进行校准,表明马达加斯加西南部地下喀斯特栖息地特有的Typhleotris属是Milyeringa的姐妹群,Milyeringa是澳大利亚西北部类似地下系统的特有物种。这两个种群都没有眼睛,我们的系统发育和生物地理学结果表明,现在在印度洋两端(相距近7000公里)发现的这些专门的洞穴鱼彼此是最近的亲戚,它们的起源要归功于白垩纪末期南部超大陆冈瓦纳大陆的分裂。在失明的穴居脊椎动物之间的跨洋姐妹群关系是未知的,我们的研究结果提供了冈瓦纳人变异的一个特殊案例。
We show using the most complete phylogeny of one of the most species-rich orders of vertebrates (Gobiiformes), and calibrations from the rich fossil record of teleost fishes, that the genus Typhleotris, endemic to subterranean karst habitats in southwestern Madagascar, is the sister group to Milyeringa, endemic to similar subterranean systems in northwestern Australia. Both groups are eyeless, and our phylogenetic and biogeographic results show that these obligate cave fishes now found on opposite ends of the Indian Ocean (separated by nearly 7,000 km) are each others closest relatives and owe their origins to the break up of the southern supercontinent, Gondwana, at the end of the Cretaceous period. Trans-oceanic sister-group relationships are otherwise unknown between blind, cave-adapted vertebrates and our results provide an extraordinary case of Gondwanan vicariance.
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