Ontogenetic variation in occlusal shape of evergrowing molars in voles: An intravital study in Microtus gregalis (Arvicolinae, Rodentia)

Маркова, Е. А.; Смирнов, Н. Г.; Kourova, Tatyana P.; Kropacheva, Yuliya E.

doi:10.1016/j.mambio.2013.03.004

Cited by 14 publications

(10 citation statements)

References 17 publications

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“…Some of the withinpopulation variation in molar morphology may be due to variation in dental wear. For example, the complexity of the M 1 occlusal outline has been shown to correlate with wear in arvicoline rodents [41]. In this study, however, extreme stages of wear were removed from the sample, and the parallel crown walls of the M. savini hypselodont M 1 make wear unlikely to have a large influence on the length-width pattern of static allometry.…”

Section: Materials and Methods (A) Samplesmentioning

confidence: 87%

Walk the line: 600000 years of molar evolution constrained by allometry in the fossil rodent Mimomys savini

Firmat

Lózano-Fernández

Agustı́

et al. 2014

Phil. Trans. R. Soc. B

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The allometric-constraint hypothesis states that evolutionary divergence of morphological traits is restricted by integrated growth regulation. In this study, we test this hypothesis on a time-calibrated and well-documented palaeontological sequence of dental measurements on the Pleistocene arvicoline rodent species Mimomys savini from the Iberian Peninsula. Based on 507 specimens representing nine populations regularly spaced over 600 000 years, we compare static (within-population) and evolutionary (among-population) allometric slopes between the width and the length of the first lower molar. We find that the static allometric slope remains evolutionary stable and predicts the evolutionary allometry quite well. These results support the hypothesis that the macroevolutionary divergence of molar traits is constrained by static allometric relationships.

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Section: Materials and Methods (A) Samplesmentioning

confidence: 87%

Walk the line: 600000 years of molar evolution constrained by allometry in the fossil rodent Mimomys savini

Firmat

Lózano-Fernández

Agustı́

et al. 2014

Phil. Trans. R. Soc. B

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“…In hypselodont species, epithelial cells proliferate and differentiate into ameloblasts continuously, allowing for enamel extension and tooth growth throughout life to compensate for wear (Müller et al 2014;Rensberger 1986;Zuri et al 1999). In fact, the prismatic, hypselodont molars of arvicolines (including voles) are thought to have evolved specifically for grinding tough, abrasive vegetation (Markova et al 2013).…”

Section: Comparisons Of Results With Those From Previous Studies Of Rodent Tooth Wearmentioning

confidence: 99%

“…Data collected represent a modified subset of those developed by Kropacheva et al (2017), focused on the maxillary molar row, and especially the first maxillary molar (M1). Microtus gregalis has classic arvicoline prismatic molars and continuous eruption to compensate for rapid wear induced by propalinal grinding or milling of tough, abrasive vegetation (Markova et al 2013). The M1 occlusal surface has an anterior loop with staggered triangles formed on the lingual (T1, T3) and buccal sides (T2, T4), from front to back, with re-entrant angles separated by salient angles formed as the apices of the triangles (Fig.…”

Section: Data Acquisitionmentioning

confidence: 99%

Assessing molar wear in narrow-headed voles as a proxy for diet and habitat in a changing Arctic

et al. 2020

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This paper investigates the potential of mesoscale tooth wear (mesowear, chipping, facets, and other wear attributes) in rodents as a proxy for Arctic habitat. It presents a pilot study of narrow-headed voles, Microtus gregalis, at three sites along a latitudinal gradient of ecological subzones in the Yamal Peninsula of the Russian Arctic. These sites include Kharp in the forest-tundra ecotone, Erkuta in the low Arctic, and Sabetta at the border between the low and the high Arctic. A total of 117 specimens were included and eight variables were used to characterize mesoscale tooth wear. Results show significant differences between the sites, suggesting that these variables can distinguish populations from different subzones. Kharp has the flattest tooth wear, whereas Sabetta has the most M1 occlusal relief and dentin exposure. These results are consistent with and interpreted in the light of published experimental work on captive voles. In addition, the Kharp sample has the tallest M1 crowns, whereas Sabetta has the most vertically implanted M1s. The general directional trends toward separation of values by latitude of samples suggests that mesoscale wear in hypselodont rodents (those with open-rooted, ever-growing molar teeth) reflects variation in food abrasivity and, by extension, may be valuable for tracking habitat and ecological changes in the Arctic. Keywords Rodents • Teeth • Climate change • Habitat assessment Why mesoscale wear?Many mesoscale tooth wear studies have focused on dental mesowear. This technique was developed originally two Handling editor: Eva Bärmann.

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“…Microtus tooth shape develops very early in the life of the organism and changes very little throughout ontogeny (Markova, Smirnov, Kourova, & Kropacheva, 2013). Because morphology is established early and intraindividual variation far exceeds individual variation, it is unlikely that biomechanical differences in food processing result in phenotypically plastic jaw and tooth differences.…”

Section: Discussionmentioning

confidence: 99%

Linking patterns of intraspecific morphology to changing climates

McGuire

Lauer

2020

Journal of Biogeography

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Aim: This study examines how climate shaped Microtus californicus (Rodentia: Arvicolinae) ecomorphology throughout the Quaternary. It tests three hypotheses: (a) climate corresponds with consistent shape variation in M. californicus dentition; (b) Quaternary warming and drying trends caused M. californicus morphotypes to predictably shift in range through time and (c) Quaternary warming and drying led to predictable changes in tooth morphological variation. Finally, we discuss how shifts in climate-linked morphological variation may affect the potential of M. californicus to react to future climate change. Location: Western United States. Taxon: Microtus californicus (Peale, 1848). Methods: Geometric morphometrics and partial least squares analyses were used to discern how climate contributes to consistent variation in the shapes of the M. californicus lower first molar (m1), validated for the full toothrow. We further corroborate this relationship, reconstructing precipitation at fossil localities using m1 morphology and comparing those values to palaeoclimate-model-derived precipitations. Disparity analyses and a MANOVA were performed to examine changes in variation and whether a shift in tooth shape occurred through time. Results: Microtus californicus m1 and toothrow shapes are narrower and more curved in cooler, wetter climates. Morphology-based palaeoclimate reconstructions align with model-based palaeoclimate estimations. When time averaging is accounted for, M. californicus demonstrates a 12% reduction in variation from fossil to presentday specimens, and these changes in tooth shape correspond with climate-related morphotypes. Main conclusions: As California became drier and hotter since the late Pleistocene, M. californicus dental morphology generally tracked these changes by adapting to the consumption of rougher vegetation in drier environments. This resulted in the loss of some high-precipitation morphotypes, indicating that ecomorphology, often observed at the species and community levels, translates to intraspecific variation and dynamically changes in response to changing climates. The loss of climate-linked morphological variation since the late Pleistocene may limit the ability of M. californicus to respond to future changes in climate. These findings portend that other species may have experienced similar losses in adaptability.

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Ontogenetic variation in occlusal shape of evergrowing molars in voles: An intravital study in Microtus gregalis (Arvicolinae, Rodentia)

Cited by 14 publications

References 17 publications

Walk the line: 600000 years of molar evolution constrained by allometry in the fossil rodent Mimomys savini

Walk the line: 600000 years of molar evolution constrained by allometry in the fossil rodent Mimomys savini

Assessing molar wear in narrow-headed voles as a proxy for diet and habitat in a changing Arctic

Linking patterns of intraspecific morphology to changing climates

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