10.5061/DRYAD.93JS1254
Barber, Brian R.
Brigham Young University
Xu, Jiawu
Brigham Young University
PĂ©rez-Losada, Marcos
University of Porto
Jara, Carlos G.
University Austral de Chile
Crandall, Keith A.
Brigham Young University
Data from: Conflicting evolutionary patterns due to mitochondrial
introgression and multilocus phylogeography of the Patagonian freshwater
crab Aegla neuquensis
Dryad
dataset
2012
Aeglidae
Quaternary
Decopoda
natural history
Holocene
crab
Aegla neuquensis
2012-11-12T19:33:50Z
2012-11-12T19:33:50Z
en
https://doi.org/10.1371/journal.pone.0037105
694569 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
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.
mitochondrial 16SSequence data from the mitochondrial 16S gene obtained
from samples of Aegla neuquensis. Sequences names are sampleID/population
name/major river(abbreviation).Aneu16S_295.nexmitochondrial COISequence
data from the mitochondrial COI gene obtained from samples of Aegla
neuquensis. Sequences names are sampleID/population name/major
river(abbreviation).AneuCOI_295.nexmitochondrial COIISequence data from
the mitochondrial COII gene obtained from samples of Aegla neuquensis.
Sequences names are sampleID/population name/major
river(abbreviation).AneuCOII_295.nexANTintronSequence data from the
nuclear ANT intron gene obtained from samples of Aegla neuquensis.
Sequences names are sampleID/population name/major
river(abbreviation).AneuANTintron104.nexEF1intronSequence data from the
nuclear EF1 Intron gene obtained from samples of Aegla neuquensis.
Sequences names are sampleID/population name/major
river(abbreviation).AneuEF1intron101.nexEF1exon122Sequence data from the
nuclear EF1 exon gene obtained from samples of Aegla neuquensis. Sequences
names are sampleID/population name/major
river(abbreviation).AneuEF1exon122.nex
South America
Argentina
Rio Negro
Patagonia
Rio Chubut