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Mammalian Biology

, Volume 73, Issue 4, pp 309–317 | Cite as

A new record and an evaluation of the phylogenetic relationships of Abrothrix olivaceus markhami (Rodentia: Sigmodontinae)

  • Enrique Rodríguez-SerranoEmail author
  • Cristián E. Hernández
  • R. Eduardo Palma
Original Investigation

Abstract

Recent phylogenetic studies of the subfamily of cricetid rodents (Sigmodntinae) have validated the taxonomic classification at the tribal level of the Andean Clade. It is possible that some endemic species from Patagonian South America are part of this new tribe, but previous studies have not evaluated this hypothesis due to the difficulty of obtaining samples. In this study, we evaluate the phylogenetic relationships of Akodon markhami (Pine, 1973), a species endemic to the Chilean Patagonia, using individuals recently captured at the type locality of this taxon. Our results indicate that this form of Akodon corresponds to a subspecies of Abrothrix olivaceus, and should be incorporated into the Andean Clade as a geographic race of this widely distributed species on the South American continent. Based on a molecular clock calibration, we dated the origin of this geographic race during the last glacial cycles of the Quaternary, as the result of a vicariant process.

key words

Abrothrix olivaceus Akodon markhami Andean Clade Biogeography Chile 

Ein neuer Fund und eine Neubewertung der phylogenetischen Einstufung von Abrothrix olivaceus markhami (Rodentia: Sigmodontinae)

Zusammenfassung

Neue phylogenetische Studien an der Subfamilie von cricetiden Nagetieren (Sigmodontinae) erlauben eine Validierung der taxonomischen Klassifikation auf Tribusebene, die u.a. in einer neuen Gruppe resultiert: dem Andinen Kladus. Es ist möglich, dass einige endemische Arten aus dem südlichsten Teil Südamerikas diesem Kladus zuzurechnen sind, wobei frühere Studien diese Hypothese aufgrund der Schwierigkeit, Probenmaterial zu erhalten, nicht bewertet haben. In dieser Studie bewerten wir die phylogenetischen Beziehungen von Akodon markhami (Pine, 1973), einer im chilenischen Patagonien endemischen Art, basierend auf kürzlich an ihrer Typuslokalität gefangenen Individuen dieser Art. Unsere Ergebnisse zeigen, dass diese Form von Akodon einer Unterart von Abrothrix olivaceus entspricht und als eine geographische Rasse dieser auf dem südamerikanischen Kontinent weit verbreiteten Art dem Andinen Kladus zugeordnet werden sollte. Auf der Basis einer molekularen Uhr-Kalibrierung wird der Ursprung dieser geographischen Rasse auf die jüngsten Glazialzyklen im Quartär als das Ergebnis eines Vikarianz-Prozesses datiert.

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Copyright information

© Deutsche Gesellschaft für Säugetierkunde 2007

Authors and Affiliations

  • Enrique Rodríguez-Serrano
    • 1
    Email author
  • Cristián E. Hernández
    • 1
    • 2
  • R. Eduardo Palma
    • 1
  1. 1.Laboratorio de Biología Evolutiva, Departamento de Ecología, Facultad de Ciencias Biológicas and Center for Advanced Studies in Ecology & BiodiversityPontificia Universidad Católica de ChileSantiagoChile
  2. 2.Laboratorio de Diversidad Molecular y Filoinformática, Departamento de ZoologíaUniversidad de Concepción and Patagonian Ecosystems Research Center (CIEP)ConcepciónChile

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