RT Journal Article
T1 Population Genomics in Rhamdia quelen (Heptapteridae, Siluriformes) Reveals Deep Divergence and Adaptation in the Neotropical Region
A1 Ríos, Néstor
A1 Casanova Chiclana, Adrián
A1 Hermida Prieto, Miguel
A1 Gómez Pardo, María Belén
A1 Martínez Portela, Paulino
A1 Bouza Fernández, María Carmen
A1 García, Graciela
K1 Genomic Divergence
K1 Environmental Adaptation
K1 Rhamdia Quelen
K1 Rad-Seq
AB Rhamdia quelen, a Neotropical fish with hybridization between highly divergent mitochondrial DNA (mtDNA) lineages, represents an interesting evolutionary model. Previous studies suggested that there might be demographic differences between coastal lagoons and riverine environments, as well as divergent populations that could be reproductively isolated. Here, we investigated the genetic diversity pattern of this taxon in the Southern Neotropical Basin system that includes the La Plata Basin, Patos-Merin lagoon basin and the coastal lagoons draining to the SW Atlantic Ocean, through a population genomics approach using 2b-RAD-sequencing-derived single nucleotide polymorphisms (SNPs). The genomic scan identified selection footprints associated with divergence and suggested local adaptation environmental drivers. Two major genomic clusters latitudinally distributed in the Northern and Southern basins were identified, along with consistent signatures of divergent selection between them. Population structure based on the whole set of loci and on the presumptive neutral vs. adaptive loci showed deep genomic divergence between the two major clusters. Annotation of the most consistent SNPs under divergent selection revealed some interesting candidate genes for further functional studies. Moreover, signals of adaptation to a coastal lagoon environment mediated by purifying selection were found. These new insights provide a better understanding of the complex evolutionary history of R. quelen in the southernmost basin of the Neotropical region
PB MDPI
YR 2020
FD 2020
LK http://hdl.handle.net/10347/21785
UL http://hdl.handle.net/10347/21785
LA eng
NO Ríos, N.; Casanova, A.; Hermida, M.; Pardo, B.G.; Martínez, P.; Bouza, C.; García, G. Population Genomics in Rhamdia quelen (Heptapteridae, Siluriformes) Reveals Deep Divergence and Adaptation in the Neotropical Region. Genes 2020, 11, 109.
NO This research was funded by Agencia Nacional de Investigación e Innovación grant numberFMV_2014_104718.We would like to thank Fondo María Viñas—Agencia Nacional de Investigación e Innovación(FMV_2014_104718) for financial support. The research of Néstor Ríos andGraciela García was also supported by Sistema Nacional de Investigadores—Agencia Nacional de Investigacióne Innovación (SNI-ANII)
DS Minerva
RD 29 abr 2026