Geographic variation in skull shape of the water rat Scapteromys tumidus (Cricetidae, Sigmodontinae): isolation-by-distance plus environmental and geographic barrier effects?

Quintela, Fernando Marques; Fornel, Rodrigo; Freitas, Thales Renato Ochotorena de

doi:10.1590/0001-3765201620140631

Cited by 13 publications

(5 citation statements)

References 37 publications

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“…Potentially, this could be explained by the isolation-by-distance model (Wright 1943), whereby the further the populations are from each other, the more limited the dispersal between them will be, and consequently the more differentiation. The association between skull morphometric and geographic distance is not a novel observation, and has been shown to occur in numerous previous rodent studies (Muñoz-Muñoz et al 2011;Cordero and Epps 2012;Quintela et al 2016;Alhajeri 2018;Alhajeri 2019). Other non-climatic spatial factors unexamined in this study could also explain the detected association with skull variation, such as environmental heterogeneity and geographic barriers (Quintela et al 2016).…”

Section: Discussionsupporting

confidence: 60%

“…The association between skull morphometric and geographic distance is not a novel observation, and has been shown to occur in numerous previous rodent studies (Muñoz-Muñoz et al 2011;Cordero and Epps 2012;Quintela et al 2016;Alhajeri 2018;Alhajeri 2019). Other non-climatic spatial factors unexamined in this study could also explain the detected association with skull variation, such as environmental heterogeneity and geographic barriers (Quintela et al 2016).…”

Section: Discussionsupporting

confidence: 60%

“…When these conspecific populations occupy widely different habitats, then selective pressures could potentially direct this differentiation (i.e., adaptive), otherwise, morphological differentiation could be neutral (i.e., when spatially separated populations occupy similar habitats). The effect of spatial separation and climate on skull differentiation is a widely studied topic in rodents, both within populations (Monteiro et al 2003;Tabatabaei Yazdi and Adriaens 2011;Cordero and Epps 2012;Renvoisé et al 2012;Tabatabaei Yazdi et al 2012;Nanova 2014;Quintela et al 2016;Alhajeri 2019;Alhajeri 2021a) and between species (Renaud and Millien 2001;Croft et al 2011;Martínez and Di Cola 2011;Alhajeri 2018;Alhajeri 2021c;Tabatabaei Yazdi and Alhajeri 2018;Yağcı and Gurbanov 2019;Álvarez et al 2021).…”

Section: Introductionmentioning

confidence: 99%

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Skull variation in populations of the Indian gerbil Tatera indica (Gerbillinae, Rodentia) sampled across its broad geographic range

Dashti¹,

Alhaddad²,

Alhajeri³

2022

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Populations of broadly distributed species often exhibit geographic structuring, which is sometimes reflected in phenotype. The monotypic Indian gerbil (Tatera indica) is an example of a widely distributed species, with its range encompassing much of Asia. This study aims to determine if T. indica populations exhibit marked variation in skull morphology—this structure is particularly adaptable and thus could be amenable to show such variation. Furthermore, the potential drivers of skull variation are examined, including the role of climate and geography. To achieve these goals, 21 linear measurements were measured on the skulls of 509 specimens, coming from 111 different localities, across this species wide range. The specimens were then assigned into one of four broad geographic groups (≈ populations) based on their geographic proximity, and the overall and the pairwise differences in the 21 skull measurements among these groups were assessed. Specimens from Pakistan significantly differed from those belonging to the West Iran, East Iran, and India populations, which in turn did not significantly differ from each other. Pairwise bioclimatic and geographic distances between the localities explained a significant, yet small amount of variation in the measurements. Thus, while the Pakistani T. indica population was distinct in skull measurements, both climatic and non-climatic spatial factors seem not to account largely for its distinctiveness (from the other populations).

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Section: Discussionsupporting

confidence: 60%

Section: Discussionsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

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Skull variation in populations of the Indian gerbil Tatera indica (Gerbillinae, Rodentia) sampled across its broad geographic range

Dashti¹,

Alhaddad²,

Alhajeri³

2022

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“…Similarly, studies on haplogroups of sympatric akodonts (e.g., Deltamys kempi [ 63 , 64 ] and Scapteromys spp. [ 65 , 66 ]). were also divergent in the geometric or linear morphometric analysis of the skull.…”

Section: Discussionmentioning

confidence: 99%

Pleistocene climatic oscillations in Neotropical open areas: Refuge isolation in the rodent Oxymycterus nasutus endemic to grasslands

et al. 2017

Self Cite

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Pleistocene climatic oscillations favoured the expansion of grassland ecosystems and open vegetation landscapes throughout the Neotropics, and influenced the evolutionary history of species adapted to such environments. In this study, we sampled populations of the rodent Oxymycterus nasutus endemic to open areas in the Pampas and Atlantic Forest biomes to assess the tempo and mode of population divergence using an integrative approach, including coalescence theory, ecological niche models, and morphometry. Our results indicated that these O. nasutus populations exhibited high levels of genetic structure. Six major mtDNA clades were found, structuring these biomes into distinct groups. Estimates of their divergence times was indicated to be 0.571 myr. The high degree of genetic structure is reflected in the analyses of geometric morphometric; skull differences between lineages in the two ecoregions were detected. During the last glacial maximum, there was a strong increase in suitable abiotic conditions for O. nasutus. Distinct molecular markers revealed a population expansion over time, with a possible demographic retraction during the post-glacial period. Considering that all clades coalesce with the last interglacial maximum, our results indicated that reduction in suitable conditions during this period may have resulted in a possible vicariance associated with refuge isolation.

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“…For instance, White and Searle examined the correlation between genetic diversity and fluctuating asymmetry (FA) in mandibles from island and mainland populations of common shrews on the west coast of Scotland using GM analysis 43 . Similarly, Quintela et al investigated the geographic variation in skull size and shape among populations of the swamp rat Scapteromys tumidus across eight geographic clusters in southern Brazil, utilizing dorsal, ventral, and lateral views of the skull 44 .…”

Section: Methodsmentioning

confidence: 99%

Functional data geometric morphometrics with machine learning for craniodental shape classification in shrews

Pillay,

Pathmanathan,

Dabo-Niang

et al. 2024

Sci Rep

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This work proposes a functional data analysis approach for morphometrics in classifying three shrew species (S. murinus, C. monticola, and C. malayana) from Peninsular Malaysia. Functional data geometric morphometrics (FDGM) for 2D landmark data is introduced and its performance is compared with classical geometric morphometrics (GM). The FDGM approach converts 2D landmark data into continuous curves, which are then represented as linear combinations of basis functions. The landmark data was obtained from 89 crania of shrew specimens based on three craniodental views (dorsal, jaw, and lateral). Principal component analysis and linear discriminant analysis were applied to both GM and FDGM methods to classify the three shrew species. This study also compared four machine learning approaches (naïve Bayes, support vector machine, random forest, and generalised linear model) using predicted PC scores obtained from both methods (a combination of all three craniodental views and individual views). The analyses favoured FDGM and the dorsal view was the best view for distinguishing the three species.

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Geographic variation in skull shape of the water rat Scapteromys tumidus (Cricetidae, Sigmodontinae): isolation-by-distance plus environmental and geographic barrier effects?

Cited by 13 publications

References 37 publications

Skull variation in populations of the Indian gerbil Tatera indica (Gerbillinae, Rodentia) sampled across its broad geographic range

Skull variation in populations of the Indian gerbil Tatera indica (Gerbillinae, Rodentia) sampled across its broad geographic range

Pleistocene climatic oscillations in Neotropical open areas: Refuge isolation in the rodent Oxymycterus nasutus endemic to grasslands

Functional data geometric morphometrics with machine learning for craniodental shape classification in shrews

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