The biogeography of <i>Dromiciops</i> in southern South America: Middle Miocene transgressions, speciation and associations with <i>Nothofagus</i>

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dc.contributor.authorQuintero-Galvis, Julian F.
dc.contributor.authorSaenz-Agudelo, Pablo
dc.contributor.authorCelis-Diez, Juan L.
dc.contributor.authorAmico, Guillermo C.
dc.contributor.authorVazquez, Soledad
dc.contributor.authorShafer, Aaron B. A.
dc.contributor.authorNespolo, Roberto F.
dc.date.accessioned2025-01-20T22:09:49Z
dc.date.available2025-01-20T22:09:49Z
dc.date.issued2021
dc.description.abstractThe current distribution of the flora and fauna of southern South America is the result of drastic geological events that occurred during the last 20 million years, including marine transgressions, glaciations and active vulcanism. All these have been associated with fragmentation, isolation and subsequent expansion of the biota, south of 35 degrees S, such as the temperate rainforest. This forest is mostly dominated by Nothofagus trees and is the habitat of the relict marsupial monito del monte, genus Dromiciops, sole survivor of the order Microbiotheria. Preliminary analyses using mtDNA proposed the existence of three main Dromiciops lineages, distributed latitudinally, whose divergence was initially attributed to recent Pleistocene glaciations. Using fossil-calibrated dating on nuclear and mitochondrial genes, here we reevaluate this hypothesis and report an older (Miocene) biogeographic history for the genus. We performed phylogenetic reconstructions using sequences from two mitochondrial DNA and four nuclear DNA genes in 159 specimens from 31 sites across Chile and Argentina. Our phylogenetic analysis resolved three main clades with discrete geographic distributions. The oldest and most differentiated clade corresponds to that of the northern distribution (35.2 degrees S to 39.3 degrees S), which should be considered a distinct species (D. bozinovici, sensu D'Elia et al. 2016). According to our estimations, this species shared a common ancestor with D. gliroides (southern clades) about similar to 13 million years ago. Divergence time estimates for the southern clades (39.6 degrees S to 42.0 degrees S) ranged from 9.57 to 6.5 Mya. A strong genetic structure was also detected within and between clades. Demographic analyses suggest population size stability for the northern clade (D. bozinovici), and recent demographic expansions for the central and southern clades. All together, our results suggest that the diversification of Dromiciops were initiated by the Middle Miocene transgression (MMT), the massive marine flooding that covered several lowlands of the western face of Los Andes between 37 and 48 degrees S. The MMT resulted from an increase in global sea levels at the Miocene climatic optimum, which shaped the biogeographic origin of several species, including Nothofagus forests, the habitat of Dromiciops.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.ympev.2021.107234
dc.identifier.eissn1095-9513
dc.identifier.issn1055-7903
dc.identifier.urihttps://doi.org/10.1016/j.ympev.2021.107234
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94349
dc.identifier.wosidWOS:000687260600004
dc.language.isoen
dc.revistaMolecular phylogenetics and evolution
dc.rightsacceso restringido
dc.subjectMicrobiotheria
dc.subjectDromiciops gliroides
dc.subjectDromiciops bozinovici
dc.subjectMiddle Miocene Transgression
dc.subjectPhylogeography
dc.subjectNothofagus
dc.subject.ods15 Life on Land
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.titleThe biogeography of <i>Dromiciops</i> in southern South America: Middle Miocene transgressions, speciation and associations with <i>Nothofagus</i>
dc.typeartículo
dc.volumen163
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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