Artículo
Demographic processes, refugia and dispersal routes during the Pleistocene in a sigmodontine rodent assemblage from the South American Pampas
Ortiz, Natalia
; Pinotti, Juan Diego
; Trimarchi, Laura Inés
; Gardenal, Cristina Noemi
; González Ittig, Raúl Enrique
; Rivera, Paula Cecilia
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Fecha de publicación:
09/2023
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Biological Journal of The Linnean Society
ISSN:
0024-4066
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The Pampas of South America represents one of the most extended subtropical–temperate grasslands in the world. This ecoregion was influenced by Pleistocene climate oscillations. The sigmodontine rodent assemblage inhabiting this region is a good model system to analyse the impact of these climate changes on evolutionary histories. We performed a comparative phylogeographical study on seven species to evaluate the concordance of phylogeographical patterns among them, to assess if they experienced congruent and synchronous demographic changes, and posit putative centres of origin and dispersal routes. Four species (Calomys musculinus, Oligoryzomys flavescens, Oxymycterus nasutus and Oligoryzomys nigripes) showed evidence of demographic expansion. In the first three, population increases started during Marine Isotope Stage 5 (MIS 5) while in Ol. nigripes, the rise started duringMIS 7; this rise would have continued to the present in all cases. Necromys lasiurus, Scapteromys tumidus and Scapteromys aquaticus did not show a pattern of expansion. Four centres of origin were identified; in general, populations sharing the same putative refugium followed common dispersal routes. Our results indicate that the Pampas offered relatively stable habitats over time, mainly in areas associated with watercourses or coastlines, suggesting that recent Pleistocene climate oscillations have had a moderate impact on this ecoregion compared to other regions of South America.
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Articulos(IDEA)
Articulos de INSTITUTO DE DIVERSIDAD Y ECOLOGIA ANIMAL
Articulos de INSTITUTO DE DIVERSIDAD Y ECOLOGIA ANIMAL
Citación
Ortiz, Natalia; Pinotti, Juan Diego; Trimarchi, Laura Inés; Gardenal, Cristina Noemi; González Ittig, Raúl Enrique; et al.; Demographic processes, refugia and dispersal routes during the Pleistocene in a sigmodontine rodent assemblage from the South American Pampas; Wiley Blackwell Publishing, Inc; Biological Journal of The Linnean Society; 2023; 9-2023; 1-16
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