Spatial and temporal divergence of the torquatus species group of the subterranean rodent Ctenomys
Subterranean rodents of the genus Ctenomys have experienced an explosive radiation and rapidly colonized the southern cone of South America. The torquatus group, one of the main groups of the genus, comprises several species and species complexes which inhabit the eastern part of the distribution of...
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todo:paper_13834517_v87_n1_p11_Caraballo2023-10-03T16:11:54Z Spatial and temporal divergence of the torquatus species group of the subterranean rodent Ctenomys Caraballo, D.A. Rossi, M.S. Bayesian phylodynamics Ctenomys Divergence times Multi-calibrated timetree Torquatus group Tuco-tucos Subterranean rodents of the genus Ctenomys have experienced an explosive radiation and rapidly colonized the southern cone of South America. The torquatus group, one of the main groups of the genus, comprises several species and species complexes which inhabit the eastern part of the distribution of Ctenomys including southern Brazil, northern and central Uruguay and north-eastern Argentina. This group has undergone a high chromosomal diversification with diploid numbers varying from 41 to 70. The aim of this study was to investigate the origins of the torquatus group as well as its diversification patterns in relation to geography and cladogenesis. Based on mitochondrial cytochrome b nucleotide sequences we conducted a Bayesian multi-calibrated relaxed clock analysis to estimate the ages of the torquatus group and its main lineages. Using the estimated evolutionary rate we performed a continuous phylogeographic analysis, using a relaxed random walk model to reconstruct the geographic diffusion of the torquatus group in a temporal frame. The torquatus group originated during the early Pleistocene between 1.25 and 2.32 million years from the present in a region that includes the northwest of Uruguay and the southeast of the Brazilian state of Río Grande do Sul. Most lineages have dispersed early towards their present distribution areas going through subsequent range expansions in the last 800,000 - 700,000 years. Ctenomys torquatus went through a rapid range expansion for the last 200,000 years, becoming the most widespread species of the group. The colonization of the Corrientes and Entre Ríos Argentinean provinces supposes at least two crossing events across the Uruguay River between 1.0 and 0.5 million years before the present, in the context of a cold and dry paleoenvironment. The resulting temporal and geographic frame enables the comprehension of the incidence of both, the amplitude of distribution areas and divergence times into the patterns of chromosomal diversification found in the group. © 2018, SPB Academic Publishing bv. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_13834517_v87_n1_p11_Caraballo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Bayesian phylodynamics Ctenomys Divergence times Multi-calibrated timetree Torquatus group Tuco-tucos |
| spellingShingle |
Bayesian phylodynamics Ctenomys Divergence times Multi-calibrated timetree Torquatus group Tuco-tucos Caraballo, D.A. Rossi, M.S. Spatial and temporal divergence of the torquatus species group of the subterranean rodent Ctenomys |
| topic_facet |
Bayesian phylodynamics Ctenomys Divergence times Multi-calibrated timetree Torquatus group Tuco-tucos |
| description |
Subterranean rodents of the genus Ctenomys have experienced an explosive radiation and rapidly colonized the southern cone of South America. The torquatus group, one of the main groups of the genus, comprises several species and species complexes which inhabit the eastern part of the distribution of Ctenomys including southern Brazil, northern and central Uruguay and north-eastern Argentina. This group has undergone a high chromosomal diversification with diploid numbers varying from 41 to 70. The aim of this study was to investigate the origins of the torquatus group as well as its diversification patterns in relation to geography and cladogenesis. Based on mitochondrial cytochrome b nucleotide sequences we conducted a Bayesian multi-calibrated relaxed clock analysis to estimate the ages of the torquatus group and its main lineages. Using the estimated evolutionary rate we performed a continuous phylogeographic analysis, using a relaxed random walk model to reconstruct the geographic diffusion of the torquatus group in a temporal frame. The torquatus group originated during the early Pleistocene between 1.25 and 2.32 million years from the present in a region that includes the northwest of Uruguay and the southeast of the Brazilian state of Río Grande do Sul. Most lineages have dispersed early towards their present distribution areas going through subsequent range expansions in the last 800,000 - 700,000 years. Ctenomys torquatus went through a rapid range expansion for the last 200,000 years, becoming the most widespread species of the group. The colonization of the Corrientes and Entre Ríos Argentinean provinces supposes at least two crossing events across the Uruguay River between 1.0 and 0.5 million years before the present, in the context of a cold and dry paleoenvironment. The resulting temporal and geographic frame enables the comprehension of the incidence of both, the amplitude of distribution areas and divergence times into the patterns of chromosomal diversification found in the group. © 2018, SPB Academic Publishing bv. |
| format |
JOUR |
| author |
Caraballo, D.A. Rossi, M.S. |
| author_facet |
Caraballo, D.A. Rossi, M.S. |
| author_sort |
Caraballo, D.A. |
| title |
Spatial and temporal divergence of the torquatus species group of the subterranean rodent Ctenomys |
| title_short |
Spatial and temporal divergence of the torquatus species group of the subterranean rodent Ctenomys |
| title_full |
Spatial and temporal divergence of the torquatus species group of the subterranean rodent Ctenomys |
| title_fullStr |
Spatial and temporal divergence of the torquatus species group of the subterranean rodent Ctenomys |
| title_full_unstemmed |
Spatial and temporal divergence of the torquatus species group of the subterranean rodent Ctenomys |
| title_sort |
spatial and temporal divergence of the torquatus species group of the subterranean rodent ctenomys |
| url |
http://hdl.handle.net/20.500.12110/paper_13834517_v87_n1_p11_Caraballo |
| work_keys_str_mv |
AT caraballoda spatialandtemporaldivergenceofthetorquatusspeciesgroupofthesubterraneanrodentctenomys AT rossims spatialandtemporaldivergenceofthetorquatusspeciesgroupofthesubterraneanrodentctenomys |
| _version_ |
1782026032954474496 |