کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2833621 1570792 2016 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Filling phylogenetic gaps and the biogeographic relationships of the Octodontidae (Mammalia: Hystricognathi)
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Filling phylogenetic gaps and the biogeographic relationships of the Octodontidae (Mammalia: Hystricognathi)
چکیده انگلیسی


• The molecularly-based clades of Octodontidae coincide with the Andean uplift.
• The validity of Octodon pacificus is supported by three independent analyses.
• Nominal genera Salinoctomys and Pipanacoctomys are species of Tympanoctomys.
• Divergence patterns are linked to the Andean uplift and Pleistocene glaciations.

Endemic to South America, octodontid rodents are remarkable by being the only mammal taxa where allotetraploidy has been documented. The taxon’s extensive morpho-physiological radiation associated to niche shifts has allowed testing phylogeographic hypotheses. Using maximum likelihood and Bayesian inference analyses, applied to all nominal species of octodontids, phylogenetic reconstructions based on sequences of 12S rRNA and growth hormone receptor gene are presented. Species boundaries were determined by coalescent analyses and divergence times among taxa were estimated based on mutation rates. Two main clades associated to the Andean orogenesis were recognized. The essentially western clade comprises genera Aconaemys, Octodon, Spalacopus, and Octodontomys whereas the eastern one included genera Octomys, Pipanacoctomys, Salinoctomys, and Tympanoctomys. Genetic relationships, coalescent analyses, and genetic distance supported the specific status given to Octodon pacificus and that given to Pipanacoctomys aureus as a species of Tympanoctomys. However, these analyses failed to recognize Salinoctomys loschalchalerosorum as a valid taxon considering its position within the diversity of Tympanoctomys barrerae. Although the origin of genome duplication remains contentious, the coincidence of the basal clade split with distinctive modes of karyotypic evolution across the Andes emphasizes the role of physiographic barriers and westerlies in shaping different edaphological conditions, selective grounds, and concomitantly distinct adaptations within the octodontids.

Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Molecular Phylogenetics and Evolution - Volume 105, December 2016, Pages 96–101
نویسندگان
, , , , ,