ORCID Profile
0000-0002-9811-2881
Current Organisations
Universidad de Concepción
,
Universidad de Concepcion
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Publisher: Public Library of Science (PLoS)
Date: 31-01-2011
Publisher: Cold Spring Harbor Laboratory
Date: 15-12-2019
DOI: 10.1101/2019.12.13.874883
Abstract: Investigating historical gene flow in species complexes can indicate how environmental and reproductive barriers shape genome ergence before speciation. The processes influencing species ersification under environmental change remain one of the central focal points of evolutionary biology, particularly for marine organisms with high dispersal potential. We investigated genome-wide ergence, introgression patterns and inferred demographic history between species pairs of all extant rock lobster species ( Jasus spp.), a complex with long larval duration, that has populated continental shelf and seamount habitats around the globe at approximately 40°S. Genetic differentiation patterns revealed the effects of the environment and geographic isolation. Species associated with the same habitat structure (either continental shelf or seamount/island) shared a common ancestry, even though the habitats were not adjacent. Differences in benthic temperature explained a significant proportion (41.3%) of the genetic differentiation. The Eastern Pacific species pair of J. caveorum and J. frontalis retained a signal of strict isolation following ancient migration, whereas species pairs from Australia and Africa and seamounts in the Indian and Atlantic oceans included events of introgression after secondary contact. Parameters estimated for time in isolation and gene flow were congruent with genetic differentiation metrics suggesting that the observed differentiation patterns are the product of migration and genetic drift. Our results reveal important effects of habitat and demographic processes on the ergence of species within the genus Jasus providing the first empirical study of genome-wide drivers of ersification that incorporates all extant species in a marine genus with long pelagic larval duration.
Publisher: Oxford University Press (OUP)
Date: 21-01-2013
Abstract: The genetic structure of present-day populations has been highly affected by glacial periods and physical oceanographic forcing, particularly with respect to species distributions and population gene-flow patterns. We assessed the current genetic composition of the Jasus frontalis population in the southeastern Pacific Islands off the coast of Chile to evaluate their connectivity modulated by contemporary and historic oceanographic processes. Population structure and demographical history for this species were assessed based on classic and Bayesian approaches using 84 sequences of cytochrome oxidase subunit I. In addition, we estimated the time of origin of J. frontalis in the different geographic zones. The analyses show a panmictic population with high gene flow between subcomponents and a lack of genetic structure (F (ST) < 0.008). This high gene flow is mainly modulated by mesoscale oceanographic factors such as eddies and meanders. In a historical spatial context, the most probable common ancestor of J. frontalis could have colonized the region around 0.258 million years before present (MYBP), first becoming established in the Juan Fernández Archipelago and then expanding toward the Desventuradas Islands. The demographic history shows a consistent increase in the effective population size (N ( e )) starting approximately 0.130 MYBP, which is highly correlated with sea-level changes during the last glacial maximum.
Publisher: Wiley
Date: 04-01-2021
DOI: 10.1111/MEC.15780
Location: No location found
No related grants have been discovered for Cristián E. Hernández.