Arid
DOI10.1371/journal.pone.0038433
Molecular Phylogeny and Phylogeography of the Australian Freshwater Fish Genus Galaxiella, with an Emphasis on Dwarf Galaxias (G. pusilla)
Unmack, Peter J.1,2; Bagley, Justin C.2; Adams, Mark3,4; Hammer, Michael P.3,5; Johnson, Jerald B.2,6
通讯作者Unmack, Peter J.
来源期刊PLOS ONE
ISSN1932-6203
出版年2012
卷号7期号:6
英文摘要

The freshwater fauna of Southern Australia is primarily restricted to the southwestern and southeastern corners of the continent, and is separated by a large, arid region that is inhospitable to this biota. This geographic phenomenon has attracted considerable interest from biogeographers looking to explain evolutionary diversification in this region. Here, we employed phylogenetic and phylogeographic approaches to evaluate the effect of this barrier on a group of four galaxiid fish species (Galaxiella) endemic to temperate Southern Australia. We also tested if continental shelf width has influenced connectivity among populations during low sea levels when rivers, now isolated, could have been connected. We addressed these questions by sampling each species across its range using multiple molecular markers (mitochondrial cytochrome b sequences, nuclear S7 intron sequences, and 49 allozyme loci). These data also allowed us to assess species boundaries, to refine phylogenetic affinities, and to estimate species ages. Interestingly, we found compelling evidence for cryptic species in G. pusilla, manifesting as allopatric eastern and western taxa. Our combined phylogeny and dating analysis point to an origin for the genus dating to the early Cenozoic, with three of the four species originating during the Oligocene-Miocene. Each Galaxiella species showed high levels of genetic divergences between all but the most proximate populations. Despite extensive drainage connections during recent low sea levels in southeastern Australia, populations of both species within G. pusilla maintained high levels of genetic structure. All populations experienced Late Pleistocene-Holocene population growth, possibly in response to the relaxation of arid conditions after the last glacial maximum. High levels of genetic divergence and the discovery of new cryptic species have important implications for the conservation of this already threatened group of freshwater species.


类型Article
语种英语
国家USA ; Australia
收录类别SCI-E
WOS记录号WOS:000305343900043
WOS关键词SOUTH-EASTERN AUSTRALIA ; MITOCHONDRIAL-DNA ; TELEOSTEI PERCICHTHYIDAE ; SOUTHEASTERN AUSTRALIA ; MAXIMUM-LIKELIHOOD ; STATISTICAL-METHOD ; PISCES GALAXIIDAE ; POPULATION-GROWTH ; BASS BASIN ; BIODIVERSITY
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/174528
作者单位1.Natl Evolutionary Synth Ctr, Durham, NC USA;
2.Brigham Young Univ, Dept Biol, Evolutionary Ecol Labs, Provo, UT 84602 USA;
3.S Australian Museum, Evolutionary Biol Unit, Adelaide, SA 5000, Australia;
4.Univ Adelaide, Sch Earth & Environm Sci, Australian Ctr Evolutionary Biol & Biodivers, Adelaide, SA, Australia;
5.Museum & Art Gallery No Terr, Darwin, NT, Australia;
6.Brigham Young Univ, Monte L Bean Life Sci Museum, Provo, UT 84602 USA
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Unmack, Peter J.,Bagley, Justin C.,Adams, Mark,et al. Molecular Phylogeny and Phylogeography of the Australian Freshwater Fish Genus Galaxiella, with an Emphasis on Dwarf Galaxias (G. pusilla)[J],2012,7(6).
APA Unmack, Peter J.,Bagley, Justin C.,Adams, Mark,Hammer, Michael P.,&Johnson, Jerald B..(2012).Molecular Phylogeny and Phylogeography of the Australian Freshwater Fish Genus Galaxiella, with an Emphasis on Dwarf Galaxias (G. pusilla).PLOS ONE,7(6).
MLA Unmack, Peter J.,et al."Molecular Phylogeny and Phylogeography of the Australian Freshwater Fish Genus Galaxiella, with an Emphasis on Dwarf Galaxias (G. pusilla)".PLOS ONE 7.6(2012).
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