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Title: Cryptic Population Structuring and the Role of the Isthmus of Tehuantepec as a Gene Flow Barrier in the Critically Endangered Central American River Turtle
Authors: González-Porter, Gracia P.
Maldonado, Jesus E.
Flores-Villela, Oscar A.
Vogt, Richard Carl
Janke, Axel
Fleischer, Robert C.
Hailer, Frank
Keywords: Cell Nucleus Dna
Dna, Mitochondrial
Central America
Controlled Study
Dermatemys Mawii
Dna Determination
Endangered Species
Evolutionary Developmental Biology
Gene Flow
Gene Frequency
Gene Locus
Gene Sequence
Genetic Conservation
Genetic Correlation
Genetic Variability
Genome Analysis
Geographic Distribution
Geographic Origin
Microsatellite Marker
Nucleotide Sequence
Population Structure
River Ecosystem
Central America
Dna, Mitochondrial
Endangered Species
Gene Flow
Genetic Variation
Population Dynamics
Issue Date: 2013
metadata.dc.publisher.journal: PLoS ONE
metadata.dc.relation.ispartof: Volume 8, Número 9
Abstract: The critically endangered Central American River Turtle (Dermatemys mawii) is the only remaining member of the Dermatemydidae family, yet little is known about its population structuring. In a previous study of mitochondrial (mt) DNA in the species, three main lineages were described. One lineage (Central) was dominant across most of the range, while two other lineages were restricted to Papaloapan (PAP; isolated by the Isthmus of Tehuantepec and the Sierra de Santa Marta) or the south-eastern part of the range (1D). Here we provide data from seven polymorphic microsatellite loci and the R35 intron to re-evaluate these findings using DNA from the nuclear genome. Based on a slightly expanded data set of a total of 253 samples from the same localities, we find that mtDNA and nuclear DNA markers yield a highly congruent picture of the evolutionary history and population structuring of D. mawii. While resolution provided by the R35 intron (sequenced for a subset of the samples) was very limited, the microsatellite data revealed pronounced population structuring. Within the Grijalva-Usumacinta drainage basin, however, many populations separated by more than 300 kilometers showed signals of high gene flow. Across the entire range, neither mitochondrial nor nuclear DNA show a significant isolation-by-distance pattern, but both genomes highlight that the D. mawii population in the Papaloapan basin is genetically distinctive. Further, both marker systems detect unique genomic signals in four individuals with mtDNA clade 1D sampled on the southeast edge of the Grijalva-Usumacinta basin. These individuals may represent a separate cryptic taxon that is likely impacted by recent admixture. © 2013.
metadata.dc.identifier.doi: 10.1371/journal.pone.0071668
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