Overcoming sampling issues in dental tribology: Insights from an experimentation on sheep

Ramdarshan, Anusha; Blondel, Cécile; Gautier, Denis; Surault, Jérôme; Merceron, Gildas

doi:10.26879/762

Cited by 30 publications

(53 citation statements)

References 49 publications

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“…Given recent results by Ramdarshan et al . (), we performed microwear analysis using three options for tooth type (i.e. combination of upper and lower molars, only lower molars and only upper molars) (Table ) and note that most of our results are not sensitive to tooth type, and the fact of grouping upper + lower teeth does not inflate the guild of mixed feeder species (contrary to the observations of Ramdarshan et al .…”

Section: Methodscontrasting

confidence: 72%

“…combination of upper and lower molars, only lower molars and only upper molars) (Table ) and note that most of our results are not sensitive to tooth type, and the fact of grouping upper + lower teeth does not inflate the guild of mixed feeder species (contrary to the observations of Ramdarshan et al . ). Because Ramdarshan et al .…”

Section: Methodsmentioning

confidence: 97%

“…Because Ramdarshan et al . () based their analyses on microwear texture, a possible explanation may be that traditional microwear variables (scratches and pits) are more robust than texture variables (complexity, anisotropy, heterogeneity, etc.) and do not show as much dependence on the type of tooth (upper vs lower) selected for study.…”

Section: Methodsmentioning

confidence: 99%

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Regional impacts of global climate change: a local humid phase in central Iberia in a late Miocene drying world

2018

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The end of the Miocene was an eventful period of changes in climate and geography, and a restructuring of terrestrial plant and mammals. The tendency towards global aridification has attracted much recent interest, making the late Miocene a striking case-study for testing current and near-future scenarios involving global warming. Little is known about the consequences of global changes in temperature and precipitation at regional or local scales. Given its geographical position and extraordinary fossil record, the Iberian Peninsula offers many insights into short-and longterm shifts in climate, and the local response. Here, we explore the diet and ecology of large-mammals through tooth-wear patterns, and examine changes in local climate and habitat conditions in central Spain in a period (9.1-6.3 Ma) for which there exists a dearth of palaeoenvironmental information. Relatively dry climates and open-woodland landscapes evolved locally during the late Vallesian and early Turolian (9.0-7.7 Ma). Unexpectedly, we detect a period of high precipitation and a peak of humidity at the end of the Turolian (7.0 Ma) that prompted the development of wetter, more forested habitats, suggesting that the traditional view of the late Miocene as a steppe landscape is a misconception. We also find a period of relatively drier and warmer conditions from the early Ventian onwards. Overall, our finding that a local episode of increased humidity in central Spain was synchronous with a global warming trend in Europe provides evidence that the greatest climatic changes may have an opposite impact at regional and local scales.

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Section: Methodscontrasting

confidence: 72%

Section: Methodsmentioning

confidence: 97%

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Regional impacts of global climate change: a local humid phase in central Iberia in a late Miocene drying world

2018

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“…Here, the reliability of new developments in describing dental microwear textures, as introduced in Francisco et al [26], is tested. To do so, the choice was made to select six sets composed of modern wild species or samples of domesticated animals fed on different diets, issued by the ANR TRIDENT Project [27][28][29]. The reader will find in the Electronic Supplementary Material (ESM) some illustrations of the different species.…”

Section: Methodsmentioning

confidence: 99%

Gathering and Analyzing Surface Parameters for Diet Identification Purposes

2018

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Modern surface acquisition devices, such as interferometers and confocal microscopes, make it possible to have accurate three-dimensional (3D) numerical representations of real surfaces. The numerical dental surfaces hold details that are related to the microwear that is caused by food processing. As there are numerous surface parameters that describe surface properties and knowing that a lot more can be built, is it possible to identify the ones that can separate taxa based on their diets? Until now, the candidates were chosen from among those provided by metrology software, which often implements International Organization for Standardization (ISO) parameters. Moreover, the way that a parameter is declared as diet-discriminative differs from one researcher to another. The aim of the present work is to propose a framework to broaden the investigation of relevant parameters and subsequently a procedure that is based on statistical tests to highlight the best of them. Many parameters were tested in a previous study. Here, some were dropped and others added to the classical ones. The resulting set is doubled while considering two derived surfaces: the initial one minus a second order and an eighth order polynomial. The resulting surfaces are then sampled-256 samples per surface-making it possible to build new derived parameters that are based on statistics. The studied dental surfaces belong to seven sets of three or more groups with known differences in diet. In almost all cases, the statistical procedure succeeds in identifying the most relevant parameters to reflect the group differences. Surprisingly, the widely used Area-scale fractal complexity (Asfc) parameter-despite some improvements-cannot differentiate the groups as accurately. The present work can be used as a standalone procedure, but it can also be seen as a first step towards machine learning where a lot of training data is necessary, thus making the human intervention prohibitive.

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“…This historical paucity of in vivo studies of dental microwear has been recently alleviated to some degree by postmortem studies of animals either recovered in the wild or obtained in laboratory settings (e.g., Calandra, Labonne, Schulz‐Kornas, Kaiser, & Montuire, ; Calandra, Zub, Sazafranska, Zalewski, & Merceron, ; Daegling et al, ; Merceron, Escarguel, Angibault, Verheyden‐Tixier, , Merceron et al, , ; Ramdarshan et al, , ; Schulz et al, ). As the diets of these animals were either known or controlled by the investigators, this work has allowed researchers to gain new insights into topics like seasonal differences in diet/dental microwear and the microwear patterns caused by foods with specific properties.…”

Section: Introductionmentioning

confidence: 99%

The dental microwear of hard‐object feeding in laboratory Sapajus apella and its implications for dental microwear formation

Teaford

Ungar

Taylor

et al. 2020

American J Phys Anthropol

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Objectives: This study seeks to determine if (a) consumption of hard food items or a mixture of food items leads to the formation of premolar or molar microwear in laboratory capuchin monkeys (Sapajus apella) in one feeding session and (b) rates of microwear formation are associated with the number of food items consumed.Materials and methods: Five adult male capuchins were used in two experiments, one where they were fed unshelled Brazil nuts, and the other where they were fed a mixture of food items. Dental impressions were taken before and after each feeding session. Epoxy casts made from those impressions then were used in SEM analyses of rates of microwear formation. Upper and lower premolars and molars were analyzed. Qualitative comparisons were made and Spearman's rank-order correlations used to examine the relationship between rates of microwear formation and number of Brazil nuts consumed.Results: Premolars and molars generally showed new microwear in the form of pits and scratches. However, the incidence of those features was low (0-6%). Rates of microwear formation were highest during the consumption of Brazil nuts.Discussion: Variations in the rate of microwear formation on the premolars likely reflected patterns of ingestion whereas consistency in the rate of microwear on the molars likely reflected patterns of chewing. While dental microwear formation seemed to be correlated with the number of hard objects consumed, rates did differ between individuals. Differences in results between the two experiments demonstrate some of the limitations in our knowledge of dental microwear formation.

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Overcoming sampling issues in dental tribology: Insights from an experimentation on sheep

Cited by 30 publications

References 49 publications

Regional impacts of global climate change: a local humid phase in central Iberia in a late Miocene drying world

Regional impacts of global climate change: a local humid phase in central Iberia in a late Miocene drying world

Gathering and Analyzing Surface Parameters for Diet Identification Purposes

The dental microwear of hard‐object feeding in laboratory Sapajus apella and its implications for dental microwear formation

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