Mammalian Biology

, Volume 97, Issue 1, pp 41–49 | Cite as

Genetic diversity of Oecomys (Rodentia, Sigmodontinae) from the Tapajós River basin and the role of rivers as barriers for the genus in the region

  • Juliane Saldanha
  • Daniela Cristina Ferreira
  • Victor Fonsêca da Silva
  • Manoel Santos-Filho
  • Ana Cristina Mendes-Oliveira
  • Rogério Vieira RossiEmail author
Original investigation


The genus Oecomys is one of the most speciose within the subfamily Sigmodontinae, with most species found in the Amazon region. Recent studies have shown that the diversity, recognition of specific boundaries and geographical distribution is still imprecise for the genus. Herein, we investigate the genetic diversity of Oecomys in the Tapajós River basin and determine whether its rivers (Tapajós, Teles Pires, and Juruena) act as barriers for some species or populations in this genus based on phylogenetic analyzes with the mitochondrial marker cytochrome b (cytb) and the nuclear marker intron 7 ß-fibrinogen, and on populational analysis with cytb. The phylogenetic relationships showed the presence of seven species in the region, namely O. bicolor, Oecomys aff. catherinae, O. catherinae, O. cleberi, O. paricola, O. roberti, and O. tapajinus. The geographic distributions of O. bicolor and O. cleberi seem to be shaped by the Tapajós and Teles Pires Rivers, with the former species occurring on the right bank and the latter species on the left bank of both rivers. Moreover, O. cleberi was the only Oecomys species to be recorded on the left bank of the Tapajós River. Our results also indicate that gene flow occurs between O. cleberi populations from the west Juruena and Tapajós Rivers and is absent between opposite banks of the Juruena River. The isolation by distance was discarded for this species. No evidence of gene flow was found for O. bicolor populations, and the isolation by distance was positive for this species. The spatial distribution of specimens and hap-lotypes of O. paricola indicates that the Teles Pires River does not act as a barrier for this species. Finally, Fs test significant results for O. cleberi and O. paricola showed that species population expansion cannot be discarded for these species.


Phylogeny Geographic distribution Gene flow Teles Pires River Juruena River 


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Copyright information

© Deutsche Gesellschaft für Säugetierkunde 2019

Authors and Affiliations

  • Juliane Saldanha
    • 1
    • 2
  • Daniela Cristina Ferreira
    • 2
  • Victor Fonsêca da Silva
    • 1
  • Manoel Santos-Filho
    • 3
  • Ana Cristina Mendes-Oliveira
    • 4
  • Rogério Vieira Rossi
    • 1
    Email author
  1. 1.Laboratório de Mastozoologia, Instituto de BiociênciasUniversidade Federal do Mato GrossoCuiabáBrazil
  2. 2.Laboratório de Citogenética e Genética Animal, Instituto de BiociênciasUniversidade Federal do Mato GrossoCuiabáBrazil
  3. 3.Laboratório de MastozoologiaUniversidade do Estado de Mato GrossoCáceresBrazil
  4. 4.Laboratório de Ecologia e Zoologia de Vertebrados - MastozoologiaICB, Universidade Federal do ParáBelémBrazil

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