The role of historical barriers in the diversification processes in open vegetation formations during the Miocene/Pliocene using an ancient rodent lineage as a model

PloS One
F F NascimentoC R Bonvicino

Abstract

The Neotropics harbors a high diversity of species and several hypotheses have been proposed to account for this pattern. However, while species of forested domains are frequently studied, less is known of species from open vegetation formations occupying, altogether, a larger area than the Amazon Forest. Here we evaluate the role of historical barriers and the riverine hypothesis in the speciation patterns of small mammals by analyzing an ancient rodent lineage (Thrichomys, Hystricomorpha). Phylogenetic and biogeographic analyses were carried out with mitochondrial and nuclear DNA markers to analyze the evolutionary relationships between Thrichomys lineages occurring in dry domains along both banks of the Rio São Francisco. This river is one of the longest of South America whose course and water flow have been modified by inland tectonic activities and climate changes. Molecular data showed a higher number of lineages than previously described. The T. inermis species complex with 2n = 26, FN = 48 was observed in both banks of the river showing a paraphyletic arrangement, suggesting that river crossing had occurred, from east to west. A similar pattern was also observed for the T. apereoides complex. Thrichomys speciation occur...Continue Reading

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Citations

Aug 8, 2015·The Journal of Heredity·Rita Gomes RochaLeonora Pires Costa
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Jun 16, 2018·Molecular Phylogenetics and Evolution·Flávia M LannaAdrian A Garda

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Datasets Mentioned

BETA
JX459849
AY083334

Methods Mentioned

BETA
PCR

Software Mentioned

Mega
Bioedit
hy ML
DIVA ( Statistical DIVA )
r B ayes
aLRT
Google Earth
Spread
BioNJ
TreeAnnotator

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