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Phylogenomic Discordance in the Eared Seals is best explained by Incomplete Lineage Sorting following Explosive Radiation in the Southern Hemisphere

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dc.contributor.author Lopes, F.
dc.contributor.author Oliveira, L.R.
dc.contributor.author Kessler, A.
dc.contributor.author Beux, Y.
dc.contributor.author Crespo, E.
dc.contributor.author Cardenas Alayza, Susana
dc.contributor.author Majluf, P.
dc.contributor.author Sepúlveda, M.
dc.contributor.author Brownell, R.L.
dc.contributor.author Franco-Trecu, V.
dc.contributor.author Páez-Rosas, D.
dc.contributor.author Chaves, J.
dc.contributor.author Loch, C.
dc.contributor.author Robertson, B.C.
dc.contributor.author Acevedo-Whitehouse, K.
dc.contributor.author Elorriaga-Verplancken, F.R.
dc.contributor.author Kirkman, S.P.
dc.contributor.author Peart, C.R.
dc.contributor.author Wolf, J.B.W.
dc.contributor.author Bonatto, S.L.
dc.date.accessioned 2021-10-04T23:00:59Z
dc.date.available 2021-10-04T23:00:59Z
dc.date.issued 2021
dc.identifier.uri https://hdl.handle.net/20.500.12866/9870
dc.description.abstract 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.] en_US
dc.language.iso eng
dc.publisher Oxford University Press
dc.relation.ispartofseries Systematic Biology
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Arctocephalus en_US
dc.subject article en_US
dc.subject California en_US
dc.subject cladistics en_US
dc.subject Eumetopias jubatus en_US
dc.subject introgression en_US
dc.subject monophyly en_US
dc.subject nonhuman en_US
dc.subject phylogenomics en_US
dc.subject Pleistocene en_US
dc.subject Pliocene en_US
dc.subject Southern Hemisphere en_US
dc.subject species differentiation en_US
dc.subject uncertainty en_US
dc.subject Zalophus en_US
dc.title Phylogenomic Discordance in the Eared Seals is best explained by Incomplete Lineage Sorting following Explosive Radiation in the Southern Hemisphere en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1093/sysbio/syaa099
dc.relation.issn 1076-836X


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