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dc.contributor.author Barber, Brian R.
dc.contributor.author Xu, Jiawu
dc.contributor.author Pérez-Losada, Marcos
dc.contributor.author Jara, Carlos G.
dc.contributor.author Crandall, Keith A.
dc.coverage.spatial South America
dc.coverage.spatial Argentina
dc.coverage.spatial Patagonia
dc.coverage.spatial Rio Negro
dc.coverage.spatial Rio Chubut
dc.coverage.temporal Quaternary
dc.coverage.temporal Holocene
dc.coverage.temporal Pleistocene
dc.date.accessioned 2012-11-12T19:34:21Z
dc.date.available 2012-11-12T19:34:21Z
dc.date.issued 2012-06-07
dc.identifier doi:10.5061/dryad.93js1254
dc.identifier.citation Barber BR, Xu J, Pérez-Losada M, Jara CG, Crandall KA (2012) Conflicting evolutionary patterns due to mitochondrial introgression and multilocus phylogeography of the Patagonian freshwater crab Aegla neuquensis. PLoS ONE, 7(6): e37105.
dc.identifier.uri http://hdl.handle.net/10255/dryad.38518
dc.description BACKGROUND: Multiple loci and population genetic methods were employed to study the phylogeographic history of the Patagonian freshwater crab Aegla neuquensis (Aeglidae: Decopoda). This taxon occurs in two large river systems in the Patagonian Steppe, from the foothills of the Andes Mountains east to the Atlantic Ocean. METHODOLOGY/PRINCIPAL FINDINGS: A nuclear phylogeny and multilocus nested clade phylogeographic analysis detected a fragmentation event between the Negro and Chico-Chubut river systems. This event occurred approximately 137 thousand years ago. An isolation-with-migration analysis and maximum-likelihood estimates of gene flow showed asymmetrical exchange of genetic material between these two river systems exclusively in their headwaters. We used information theory to determine the best-fit demographic history between these two river systems under an isolation-with-migration model. The best-fit model suggests that the Negro and the ancestral populations have the same effective population sizes; whereas the Chico-Chubut population is smaller and shows that gene flow from the Chico-Chubut into the Negro is four times higher than in the reverse direction. Much of the Chico-Chubut system appears to have only been recently colonized while the Negro populations appear to have been in place for most of the evolutionary history of this taxon. CONCLUSIONS/SIGNIFICANCE: Due to mitochondrial introgression, three nuclear loci provided different phylogeographic resolution than the three mitochondrial genes for an ancient fragmentation event observed in the nuclear phylogeny. However, the mitochondrial locus provided greater resolution on more recent evolutionary events. Our study, therefore, demonstrates the need to include both nuclear and mitochondrial loci for a more complete understanding of evolutionary histories and associated phylogeographic events. Our results suggest that gene flow between these systems, before and after fragmentation was through periodic paleolakes that formed in the headwaters region. Fragmentation between the Negro and Chico-Chubut systems was driven by the disappearance of these paleolakes during the Patagonian Glaciation.
dc.relation.haspart doi:10.5061/dryad.93js1254/1
dc.relation.haspart doi:10.5061/dryad.93js1254/2
dc.relation.haspart doi:10.5061/dryad.93js1254/3
dc.relation.haspart doi:10.5061/dryad.93js1254/4
dc.relation.haspart doi:10.5061/dryad.93js1254/5
dc.relation.haspart doi:10.5061/dryad.93js1254/6
dc.relation.isreferencedby doi:10.1371/journal.pone.0037105
dc.relation.isreferencedby PMID:22685541
dc.subject phylogeography
dc.subject introgression
dc.subject gene flow
dc.subject evolution
dc.subject crab
dc.subject natural history
dc.title Data from: Conflicting evolutionary patterns due to mitochondrial introgression and multilocus phylogeography of the Patagonian freshwater crab Aegla neuquensis
dc.type Article *
dwc.ScientificName Decopoda
dwc.ScientificName Aeglidae
dwc.ScientificName Aegla neuquensis
dc.contributor.correspondingAuthor Barber, Brian R.
prism.publicationName PLoS ONE

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Title mitochondrial 16S
Downloaded 83 times
Description Sequence data from the mitochondrial 16S gene obtained from samples of Aegla neuquensis. Sequences names are sampleID/population name/major river(abbreviation).
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Title mitochondrial COI
Downloaded 76 times
Description Sequence data from the mitochondrial COI gene obtained from samples of Aegla neuquensis. Sequences names are sampleID/population name/major river(abbreviation).
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Title mitochondrial COII
Downloaded 84 times
Description Sequence data from the mitochondrial COII gene obtained from samples of Aegla neuquensis. Sequences names are sampleID/population name/major river(abbreviation).
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Title ANTintron
Downloaded 78 times
Description Sequence data from the nuclear ANT intron gene obtained from samples of Aegla neuquensis. Sequences names are sampleID/population name/major river(abbreviation).
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Title EF1intron
Downloaded 69 times
Description Sequence data from the nuclear EF1 Intron gene obtained from samples of Aegla neuquensis. Sequences names are sampleID/population name/major river(abbreviation).
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Title EF1exon122
Downloaded 81 times
Description Sequence data from the nuclear EF1 exon gene obtained from samples of Aegla neuquensis. Sequences names are sampleID/population name/major river(abbreviation).
Download AneuEF1exon122.nex (81.89Kb)
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