A contribution to the knowledge of the taxonomy of the subgenus Abrothrix (Angelomys) (Rodentia, Cricetidae) in southernmost South America

Sánchez, Julieta Morales; Poljak, Sebastián; Teta, Pablo; Lanusse, Lucas; Lizarralde, Marta Susana

doi:10.1007/s00300-022-03020-9

Cited by 2 publications

(5 citation statements)

References 47 publications

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“…The olive field mouse, Abrothrix olivacea (Family Cricetidae, Tribe Abrotrichini), matches with the second scheme described by Pardiñas et al 31 ; its mitochondrial diversity is structured in four main and mostly allopatric phylogroups originated during the last million years, which experienced independent demographic dynamics 37 ; see also 33 , 40 – 42 . However, no study has explicitly evaluated whether the identified patterns of genetic structure correlate with landscape features and their temporal dynamism.…”

Section: Introductionsupporting

confidence: 76%

Climate influences the genetic structure and niche differentiation among populations of the olive field mouse Abrothrix olivacea (Cricetidae: Abrotrichini)

Quiroga-Carmona

D’Elı́a

2022

Sci Rep

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Even when environmental variation over time and space is commonly considered as an important driver of population divergence, few evaluations of intraspecific genetic variation explicitly assess whether observed structure has been caused by or is correlated with landscape heterogeneity. Several phylogeographic studies have characterized the mitochondrial diversity of Abrothrix olivacea, but none has incorporated landscape genetics analyses and ecological niche modeling, leaving a gap in the understanding of the species evolutionary history. Here, these aspects were addressed based on 186 single nucleotide polymorphisms, extracted from sequences of 801 bp of Cytb gene, gathered from 416 individuals collected at 103 localities in Argentina and Chile. Employing multivariate statistical analyses (gPCA, Mantel and Partial Mantel Tests, Procrustes Analysis, and RDA), associations between genetic differences and geographic and climatic distances were evaluated. Presence data was employed to estimate the potential geographic distribution of this species during historical and contemporary climatic scenarios, and to address differences among the climatic niches of their main mitochondrial lineages. The significant influence of landscape features in structuring mitochondrial variability was evidenced at different spatial scales, as well as the role of past climatic dynamics in driving geographic range shifts, mostly associated to Quaternary glaciations. Overall, these results suggest that throughout geographic range gene flow is unevenly influenced by climatic dissimilarity and the geographic distancing, and that studied lineages do not exhibit distributional signals of climatic niche conservatism. Additionally, genetic differentiation occurred by more complex evolutionary processes than mere disruption of gene flow or drift.

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Section: Introductionsupporting

confidence: 76%

Climate influences the genetic structure and niche differentiation among populations of the olive field mouse Abrothrix olivacea (Cricetidae: Abrotrichini)

Quiroga-Carmona

D’Elı́a

2022

Sci Rep

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“…The cranial distinction exhibited by the analyzed island populations have implications that can help to clarify its taxonomic status, as these have been referred to distinct species or as subspecies of Abrothrix olivacea (see Patterson, Teta & Smith, 2015 ; Quiroga-Carmona et al, 2022 ; Sánchez et al, 2022 ). The mitochondrial differentiation of populations from the Wellington Island (locality 51; Fig.…”

Section: Discussionmentioning

confidence: 99%

“…o . llanoi , respectively, was recently advocated by Sánchez et al (2022) , based on cranial and mitochondrial differences. Quiroga-Carmona et al (2022) for hershkovitzi and Sánchez et al (2022) for hershkovitzi and llanoi , consistently describe that although the haplotypes present in both islands were unique and restricted to these places, their genetic differentiation from the Tierra del Fuego populations is low.…”

Section: Discussionmentioning

confidence: 99%

“…llanoi , respectively, was recently advocated by Sánchez et al (2022) , based on cranial and mitochondrial differences. Quiroga-Carmona et al (2022) for hershkovitzi and Sánchez et al (2022) for hershkovitzi and llanoi , consistently describe that although the haplotypes present in both islands were unique and restricted to these places, their genetic differentiation from the Tierra del Fuego populations is low. However, given its geographic isolation and phenotypic distinctiveness, these populations can be considered as evolutionary significant units (see Ryder, 1986 ; Moritz, 1994 ), and its recognition as subspecies of A .…”

Section: Discussionmentioning

confidence: 99%

“…The phenotypic variation of Abrothrix olivacea has been addressed by several studies, mainly focused on characterizing the anatomical variability of the digestive and excretory systems ( e.g ., Bozinovic et al, 2010 , 2011 ; Naya et al, 2014 ), as well as the shape and size of skull ( e.g ., Pine, 1973 ; Yáñez, Valencia & Jaksic, 1979 ; Patterson, Gallardo & Freas, 1984 ; Valladares-Gómez et al, 2020 ; Sánchez et al, 2022 ). These have demonstrated that variation of the assessed traits is correlated with environmental characteristics, such as water availability and the latitudinal distribution of populations.…”

Section: Introductionmentioning

confidence: 99%

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The skull variation of the olive field mouseAbrothrix olivacea(Cricetidae: Abrotrichini) is localized and correlated to the ecogeographic features of its geographic distribution

Quiroga-Carmona

Teta

D’Elı́a

2023

PeerJ

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The relationship between phenotypic variation and landscape heterogeneity has been extensively studied to understand how the environment influences patterns of morphological variation and differentiation of populations. Several studies had partially addressed intraspecific variation in the sigmodontine rodent Abrothrix olivacea, focusing on the characterization of physiological aspects and cranial variation. However, these had been conducted based on geographically restricted populational samples, and in most cases, the aspects characterized were not explicitly contextualized with the environmental configurations in which the populations occurred. Here, the cranial variation of A. olivacea was characterized by recording twenty cranial measurements in 235 individuals from 64 localities in Argentina and Chile, which widely cover the geographic and environmental distribution of this species. The morphological variation was analyzed and ecogeographically contextualized using multivariate statistical analyses, which also included climatic and ecological variation at the localities where the individuals were sampled. Results indicate that the cranial variation of this species is mostly clustered in localized patterns associated to the types of environments, and that the levels of cranial differentiation are higher among the populations from arid and treeless zones. Additionally, the ecogeographical association of cranial size variation indicate that this species does not follow Bergmann’s rule and that island populations exhibit larger cranial sizes compared to their continental counterparts distributed at the same latitudes. These results suggest that cranial differentiation among the populations of this species is not homogeneous throughout its geographic distribution, and that the patterns of morphological differentiation are also not completely consistent with the patterns of genetic structuring that have been described recently. Finally, the analyses performed to ponder morphological differentiation among populations suggest that the contribution of genetic drift in the formation of these patterns can be ruled out among Patagonian populations, and that the selective effect imposed by the environment could better explain them.

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A contribution to the knowledge of the taxonomy of the subgenus Abrothrix (Angelomys) (Rodentia, Cricetidae) in southernmost South America

Cited by 2 publications

References 47 publications

Climate influences the genetic structure and niche differentiation among populations of the olive field mouse Abrothrix olivacea (Cricetidae: Abrotrichini)

Climate influences the genetic structure and niche differentiation among populations of the olive field mouse Abrothrix olivacea (Cricetidae: Abrotrichini)

The skull variation of the olive field mouseAbrothrix olivacea(Cricetidae: Abrotrichini) is localized and correlated to the ecogeographic features of its geographic distribution

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