A comprehensive overview of the genetic diversity in Thylamys elegans (Didelphimorphia: Didelphidae): establishing the phylogeographic determinants

Boric-Bargetto, Dusan; Zuniga-Reinoso, Alvaro; Inostroza-Michel, Oscar; Rodriguez-Serrano, Enrique; Gonzalez-Acuna, Daniel; Eduardo Palma, R.; Hernandez, Cristian E.

Abstract

Background For the genus Thylamys, the rivers have been reported as barriers to dispersal, limiting current and historical distribution of its lineages. We hypothesized that the Maipo river has affected the genetic structure of northern and southern lineages of Thylamys elegans, recovering a phylogenetic relationships with reciprocally monophyletic sister groups on opposite river banks. We evaluated the role of other rivers in the Mediterranean zone of Chile as historical and recent modulators of the biogeographic processes of this species. Methods We applied a phylogeographic approach, using the cytochrome-b mitochondrial gene for 93 individuals of T. elegans, from 37 localities in a latitudinal gradient between 21 degrees 25' and 3556'S, encompassing a geographic area between the Atacama Desert and most of the Mediterranean Chilean zone. Results The phylogenetics results recovered six lineages within T. elegans: Thylamys elegans elegans, Thylamys elegans coquimbensis, the Loa lineage and three other lineages not described previously (Aconcagua, South 1 and South 2). We suggest that following rivers play a role like primary barrier: the Maipo river in the genetic differentiation of northern and southern ancestral lineages, and the Mataquito river and its tributary Teno river for the South 1 and South 2 lineages. On the other hand, the Quilimari river preserve the genetic divergence in T. e. coquimbensis and Aconcagua lineage and the Aconcagua river in Aconcagua lineage and T. e. elegans acting like secondary barriers. Conclusions We concluded that the genetic diversity and biogeographic history of T. elegans was shaped by mountain glaciers, changes in river water levels during the Pleistocene glaciations and hyperaridity, promoting the differentiation and persistance of the T. elegans lineages.

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Título según WOS: ID WOS:000717519700001 Not found in local WOS DB
Título de la Revista: Revista Chilena de Historia Natural
Volumen: 94
Número: 1
Editorial: SOC BIOLGIA CHILE
Fecha de publicación: 2021
DOI:

10.1186/s40693-021-00103-5

Notas: ISI