Artículo
Phylogenomic Discordance in the Eared Seals is best explained by Incomplete Lineage Sorting following Explosive Radiation in the Southern Hemisphere
Lopes, Fernando; Oliveira, Larissa R.; Kessler, Amanda; Beux, Yago; Crespo, Enrique Alberto
; Cárdenas-Alayza, Susana; Majluf, Patricia; Sepúlveda, Maritza; Brownell, Robert L.; Franco-Trecu, Valentina; Páez-Rosas, Diego; Chaves, Jaime; Loch, Carolina; Robertson, Bruce C.; Acevedo-Whitehouse, Karina; Elorriaga-Verplancken, Fernando R.; Kirkman, Stephen P.; Peart, Claire R.; Wolf, Jochen B W; Bonatto, Sandro Luis
![Icon](/themes/CONICETDigital/images/conicet.png)
Fecha de publicación:
06/2021
Editorial:
Oxford University Press
Revista:
Systematic Biology
ISSN:
1063-5157
e-ISSN:
1076-836X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The phylogeny and systematics of fur seals and sea lions (Otariidae) have long been studied with diverse data types, including an increasing amount of molecular data. However, only a few phylogenetic relationships have reached acceptance because of strong gene-tree species tree discordance. Divergence times estimates in the group also vary largely between studies. These uncertainties impeded the understanding of the biogeographical history of the group, such as when and how trans-equatorial dispersal and subsequent speciation events occurred. Here, we used high-coverage genome-wide sequencing for 14 of the 15 species of Otariidae to elucidate the phylogeny of the family and its bearing on the taxonomy and biogeographical history. Despite extreme topological discordance among gene trees, we found a fully supported species tree that agrees with the few well-accepted relationships and establishes monophyly of the genus Arctocephalus. Our data support a relatively recent trans-hemispheric dispersal at the base of a southern clade, which rapidly diversified into six major lineages between 3 and 2.5 Ma. Otaria diverged first, followed by Phocarctos and then four major lineages within Arctocephalus. However, we found Zalophus to be nonmonophyletic, with California (Zalophus californianus) and Steller sea lions (Eumetopias jubatus) grouping closer than the Galapagos sea lion (Zalophus wollebaeki) with evidence for introgression between the two genera. Overall, the high degree of genealogical discordance was best explained by incomplete lineage sorting resulting from quasi-simultaneous speciation within the southern clade with introgresssion playing a subordinate role in explaining the incongruence among and within prior phylogenetic studies of the family. [Hybridization; ILS; phylogenomics; Pleistocene; Pliocene; monophyly.].
Palabras clave:
PHYLOGENOMICS
,
ILS
,
HYBRIDIZATION
,
PLIOCENE
,
PLEISTOCENE
,
MONOPHYLY
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Licencia
Identificadores
Colecciones
Articulos(CESIMAR)
Articulos de CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Articulos de CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Citación
Lopes, Fernando; Oliveira, Larissa R.; Kessler, Amanda; Beux, Yago; Crespo, Enrique Alberto; et al.; Phylogenomic Discordance in the Eared Seals is best explained by Incomplete Lineage Sorting following Explosive Radiation in the Southern Hemisphere; Oxford University Press; Systematic Biology; 70; 4; 6-2021; 786-802
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