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Title: In the wake of invasion: Tracing the historical biogeography of the South American cricetid radiation (Rodentia, Sigmodontinae)
Authors: Leite, Rafael N.
Kolokotronis, Sergios-Orestis
Almeida, Francisca Cunha
Werneck, F. P.
Rogers, Duke S.
Weksler, Marcelo
Keywords: Cell Nucleus Dna
Dna, Mitochondrial
Dna, Mitochondrial
Central America
Comparative Study
Dna Sequence
Geographic Distribution
Middle Miocene
Molecular Phylogeny
South America
Species Distribution
Species Diversity
Species Invasion
Species Richness
Upper Miocene
Cell Nucleus
Environmental Aspects And Related Phenomena
Introduced Species
Evolution, Molecular
Cell Nucleus
Dna, Mitochondrial
Ecological And Environmental Processes
Evolution, Molecular
Introduced Species
Sequence Analysis, Dna
South America
Time Factors
Issue Date: 2014
metadata.dc.publisher.journal: PLoS ONE
metadata.dc.relation.ispartof: Volume 9, Número 6
Abstract: The Great American Biotic Interchange (GABI) was greatly influenced by the completion of the Isthmus of Panama and impacted the composition of modern faunal assemblages in the Americas. However, the contribution of preceding events has been comparatively less explored, even though early immigrants in the fossil records are evidence for waif dispersals. The cricetid rodents of the subfamily Sigmodontinae are a classic example of a species-rich South American radiation resulting from an early episode of North American invasion. Here, we provide a temporal and spatial framework to address key aspects of the historical biogeography and diversification of this diverse mammal group by using mitochondrial and nuclear DNA datasets coupled with methods of divergence time estimation, ancestral area reconstruction and comparative phylogenetics. Relaxed-clock time estimates indicate that divergence of the Sigmodontinae began in the middle-late Miocene (ca. 12-9 Ma). Dispersal-vicariance analyses point to the arrival of a single lineage of northern invaders with a widespread ancestral distribution and imply that the initial differentiation between Central and South America gave rise to the most basal groups within the subfamily. These two major clades diversified in the late Miocene followed by the radiation of main tribes until the early Pliocene. Within the Oryzomyalia, tribes diverged initially in eastern South America whereas multiple dispersals into the Andes promoted further diversification of the majority of modern genera. A comparatively uniform background tempo of diversification explains the species richness of sigmodontines across most nodes, except for two akodontine genera with recent increases in diversification rates. The bridging of the Central American seaway and episodes of low sea levels likely facilitated the invasion of South America long before the onset of the post-Isthmian phase of the GABI. © 2014 Leite et al.
metadata.dc.identifier.doi: 10.1371/journal.pone.0100687
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