Signatures of local adaptation in the spatial genetic structure of the ascidian Pyura chilensis along the southeast Pacifc coast
Author
dc.contributor.author
Segovia, Nicolás I.
Author
dc.contributor.author
González Wevar, Claudio
Author
dc.contributor.author
Haye, Pilar A.
Admission date
dc.date.accessioned
2021-01-27T20:07:19Z
Available date
dc.date.available
2021-01-27T20:07:19Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
ScientIfic Reports Volumen: 10 Número: 1 AUG 24 2020
es_ES
Identifier
dc.identifier.other
10.1038/s41598-020-70798-1
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/178375
Abstract
dc.description.abstract
The highly heterogeneous Humboldt Current System (HCS) and the 30 degrees S transition zone on the southeast Pacific coast, represent an ideal scenario to test the influence of the environment on the spatial genomic structure in marine near-shore benthic organisms. In this study, we used seascape genomic tools to evaluate the genetic structure of the commercially important ascidian Pyura chilensis, a species that exhibits a low larval transport potential but high anthropogenic dispersal. A recent study in this species recorded significant genetic differentiation across a transition zone around 30 degrees S in putatively adaptive SNPs, but not in neutral ones, suggesting an important role of environmental heterogeneity in driving genetic structure. Here, we aim to understand genomic-oceanographic associations in P. chilensis along the Southeastern Pacific coast using two combined seascape genomic approaches. Using 149 individuals from five locations along the HCS, a total of 2,902 SNPs were obtained by Genotyping-By-Sequencing, of which 29-585 were putatively adaptive loci, depending on the method used for detection. In adaptive loci, spatial genetic structure was better correlated with environmental differences along the study area (mainly to Sea Surface Temperature, upwelling-associated variables and productivity) than to the geographic distance between sites. Additionally, results consistently showed the presence of two groups, located north and south of 30 degrees S, which suggest that local adaptation processes seem to allow the maintenance of genomic differentiation and the spatial genomic structure of the species across the 30 degrees S biogeographic transition zone of the Humboldt Current System, overriding the homogenizing effects of gene flow.
es_ES
Patrocinador
dc.description.sponsorship
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT
FONDECYT 1140862
FONDECYT 3190482