Phylogeography and genetic variation in the South American rodent Tympanoctomys barrerae (Rodentia: Octodontidae)

Ojeda, Agustina A.

doi:10.1644/09-mamm-a-177.1

Cited by 32 publications

(27 citation statements)

References 51 publications

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“…Consistent with the theoretical expectations of deme structure and small population size of octodontids (Opazo et al ., ) and ctenomyds rodents (Lacey, ; Mora et al ., ), high levels of haplotypic diversity but low levels of nucleotide substitutions were found within populations of T. barrerae ( H D and Pi, respectively; Table ). These results contrast with previous analyses based on the control region of T. barrerae (Ojeda, ), probably as a result of the different amplitude in both sampling sites and sample size with respect to the present study (i.e. Malargüe: 12 versus 21; Añelo Tero: 23 versus 49; Nihuil: 4 versus 11).…”

Section: Discussioncontrasting

confidence: 99%

“…A previous phylogeographical analysis of 60 specimens using a 800‐bp segment of the mitochondrial d ‐loop revealed moderate levels of population genetic structure and low haplotype and nucleotide diversities in central populations of T. barrerae (Ojeda, ). In the present study, we examine mitochondrial (mt)DNA sequences of seven populations, totalling 107 individuals of the red vizcacha rat using two slower evolving mitochondrial genes [cytochrome oxidase I (COI) and cytochrome b (cyt b )].…”

Section: Introductionmentioning

confidence: 84%

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Phylogenetic analysis and phylogeography of the tetraploid rodentTympanoctomys barrerae(Octodontidae): insights on its origin and the impact of Quaternary climate changes on population dynamics

Gallardo

Suárez-Villota

Núñez

et al. 2012

Biol J Linn Soc Lond

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The allotetraploid Tympanoctomys barrerae has a broad, patchy distribution around salt flats in western Argentina. To gain insights into its phylogenetic relationships, phylogeographical patterns, and origin, seven populations of T. barrerae and its allied taxa were studied through a 1075-bp fragment of cytochrome b and cytochrome oxidase I. Matrilineal phylogenetic relationships were explored with maximum likelihood and Bayesian approaches. The intraspecific genealogy was inferred by median-joining networks. The populational structure was assessed by molecular variance, and the demographic history through coalescence. The tree topology depicted sister-group relationship between Octomys mimax to the pair T. barrerae-Pipanacoctomys aureus, suggesting P. aureus belongs to the maternal lineage that gave rise to T. barrerae. High degrees of intrapopulational variation and the several instances of interpopulational polyphyly suggest range shifts and secondary contact. Consistent with the phylogenetic results, the network analysis revealed two haplotypic lineages depicting genetic admixtures unrelated to the current geographical distribution, and a deep split with the southernmost lineage of Chubut. The origin of T barrerae was estimated at approximately 2.52 Mya, whereas the divergence estimate for Chubut coincides with the end of largest Patagonian glaciation, at 1.47 Mya. Apparently, this population remained isolated during a northward Pleistocenic range shift. The historical demographic patterns of the lineages of T. barrerae fit with a contraction-expansion model coincident with Quaternary cycling events.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 84%

Phylogenetic analysis and phylogeography of the tetraploid rodentTympanoctomys barrerae(Octodontidae): insights on its origin and the impact of Quaternary climate changes on population dynamics

Gallardo

Suárez-Villota

Núñez

et al. 2012

Biol J Linn Soc Lond

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“…Octodontid rodents are highly diverse in eco-morphological aspects, including six genera with terrestrial, semi-fossorial, fossorial and subterranean forms (Ojeda et al 2013; Verzi et al 2015). Due to their broad ecological and geographical diversity at both sides of the Andean mountain range, these rodents represent a very interesting group in biogeographical and evolutionary aspects (Lessa et al 2008; Ojeda 2010; Ojeda et al 2013). …”

Section: Introductionmentioning

confidence: 99%

Morphology of the limbs in the semi-fossorial desert rodent species of Tympanoctomys (Octodontidae, Rodentia)

Perez¹,

Bárquez²,

Díaz³

2017

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Here, a detailed description of the forelimbs and hindlimbs of all living species of the genus Tympanoctomys are presented. These rodents, highly adapted to desert environments, are semi-fossorial with capacity to move on the surface as well as to build burrows. The shape, structure, and size of the limbs are described. Contrary to what was expected for scratch digging semi-fossorial species, Tympanoctomys have slender humerus, radius and ulna; with narrow epicondyles of the humerus and short olecranon of the ulna with poorly developed processes. Following our descriptions, no intrageneric morphological variation regarding to the configuration of the limbs was detected, probably due to phylogenetic proximity, and not related to specific variations in response to different use of substrates or habits. The obtained results constitute a source of previously unpublished information as well as an important base for future analysis in different studies, such as morphometric, morpho-functional, or phylogenetic researches.

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“…Phylogeographic studies in this region are scarce and have been conducted on rodents [19-21], lizards [22-24], amphibians [9,25], and a bird species [26]. Several of these studies suggested that the phylogeographic patterns observed, such as past fragmentation, range expansion, and secondary contact, could in part be understood in light of Pleistocene climate conditions.…”

Section: Introductionmentioning

confidence: 99%

The high Andes, gene flow and a stable hybrid zone shape the genetic structure of a wide-ranging South American parrot

et al. 2011

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BackgroundWhile the gene flow in some organisms is strongly affected by physical barriers and geographical distance, other highly mobile species are able to overcome such constraints. In southern South America, the Andes (here up to 6,900 m) may constitute a formidable barrier to dispersal. In addition, this region was affected by cycles of intercalating arid/moist periods during the Upper/Late Pleistocene and Holocene. These factors may have been crucial in driving the phylogeographic structure of the vertebrate fauna of the region. Here we test these hypotheses in the burrowing parrot Cyanoliseus patagonus (Aves, Psittaciformes) across its wide distributional range in Chile and Argentina.ResultsOur data show a Chilean origin for this species, with a single migration event across the Andes during the Upper/Late Pleistocene, which gave rise to all extant Argentinean mitochondrial lineages. Analyses suggest a complex population structure for burrowing parrots in Argentina, which includes a hybrid zone that has remained stable for several thousand years. Within this zone, introgression by expanding haplotypes has resulted in the evolution of an intermediate phenotype. Multivariate regressions show that present day climatic variables have a strong influence on the distribution of genetic heterogeneity, accounting for almost half of the variation in the data.ConclusionsHere we show how huge barriers like the Andes and the regional environmental conditions imposed constraints on the ability of a parrot species to colonise new habitats, affecting the way in which populations diverged and thus, genetic structure. When contact between divergent populations was re-established, a stable hybrid zone was formed, functioning as a channel for genetic exchange between populations.

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Phylogeography and genetic variation in the South American rodent Tympanoctomys barrerae (Rodentia: Octodontidae)

Cited by 32 publications

References 51 publications

Phylogenetic analysis and phylogeography of the tetraploid rodentTympanoctomys barrerae(Octodontidae): insights on its origin and the impact of Quaternary climate changes on population dynamics

Phylogenetic analysis and phylogeography of the tetraploid rodentTympanoctomys barrerae(Octodontidae): insights on its origin and the impact of Quaternary climate changes on population dynamics

Morphology of the limbs in the semi-fossorial desert rodent species of Tympanoctomys (Octodontidae, Rodentia)

The high Andes, gene flow and a stable hybrid zone shape the genetic structure of a wide-ranging South American parrot

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