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Demographic processes, refugia and dispersal routes during the Pleistocene in a sigmodontine rodent assemblage from the South American Pampas.
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- Author(s): Ortiz, N1 (AUTHOR) ; Pinotti, J D1 (AUTHOR); Trimarchi, L I1 (AUTHOR); Gardenal, C N1,2 (AUTHOR); González-Ittig, R E1,2 (AUTHOR); Rivera, P C1,3 (AUTHOR)
- Source:
Biological Journal of the Linnean Society. Mar2024, Vol. 141 Issue 3, p419-434. 16p.- Subject Terms:
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- Subject Terms:
- Abstract: 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 during MIS 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. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Biological Journal of the Linnean Society is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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