Tooth wear patterns in black rats (<i>Rattus rattus</i>) of Madagascar differ more in relation to human impact than to differences in natural habitats

Winkler, Daniela; Andrianasolo, Tolona H.; Andriamandimbiarisoa, Laza N.; Ganzhorn, Jörg U.; Rakotondranary, S. Jacques; Kaiser, Thomas M.; Schulz‐Kornas, Ellen

doi:10.1002/ece3.2048

Cited by 24 publications

(30 citation statements)

References 45 publications

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“…In the case of individuals in the Wild (S) population, which also often invade cultivation areas, it is unsurprising that their tooth surface textures were similar to those of reared pigs (i.e., artificially fed on crops). Winkler et al [ 46 ] also reported that the tooth surface textures of modern small mammals were affected by forest cultivation. Some of the Wild (S) population may have consumed agricultural crops before being hunted, which resulted in the surface texture of their teeth being similar to that of the stall-fed population.…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional tooth surface texture analysis on stall-fed and wild boars (Sus scrofa)

Yamada

Kubo

et al. 2018

PLoS ONE

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Categorizing the archaeological remains of Sus scrofa as domesticated “pigs” or wild “boars” is often difficult because of their morphological and genetic similarities. For this purpose, we tested whether feeding ecological change of S. scrofa that accompanied their domestication can be detected based on the three-dimensional texture created on the tooth enamel surface by mastication. We scanned the lower tooth surface of one wild and one stall-fed populations of modern S. s. leucomystax and one wild population of S. s. riukiuanus by using a confocal laser microscope. The average body weight of S. s. leucomystax is twice as heavier as that of S. s. riukiuanus. The textures were quantified using the industrial “roughness” standard, ISO 25178, to prevent inter-observer errors and to distinguish small differences that were difficult to detect by two dimensional image observation. The values of parameters related to height and volume were significantly larger in the stall-fed population. Twenty parameters differed significantly between the stall-fed and wild population of S. s. leucomystax, which indicated that the feeding ecological difference affected the ISO parameters of the two boar populations. Six parameters also differed between the wild populations of S. s. leucomystax and S. s. riukiuanus. Surprisingly, no parameter differed between the populations of stall-fed S. s. leucomystax and wild S. s. riukiuanus. Consumption of hard nuts and/or agricultural fruits and crops by the wild population of S. s. riukiuanus may have produced a tooth surface texture similar to that of the stall-fed population of S. s. leucomystax. Further analysis of S. s. riukiuanus with a known diet is necessary to conclude whether ISO parameters reflect the dietary transition accompanying the domestication of Sus (e.g., wild, semi-domestic, and domestic). Until then, caution is needed in discriminating domesticated populations from wild populations that mainly feed on hard objects.

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Section: Discussionmentioning

confidence: 99%

Three-dimensional tooth surface texture analysis on stall-fed and wild boars (Sus scrofa)

Yamada

Kubo

et al. 2018

PLoS ONE

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“…Natural geographical variation in diet, particularly where species have large or heterogeneous ranges, is also likely to affect microwear. DMTA studies have considered differences between geographical regions in pigs [35], rodents [19,29,36,37], deer [18,38], primates [39], lemurs [17] and humans (e.g. [40][41][42]).…”

Section: Intraspecific Factorsmentioning

confidence: 99%

Incorporating intraspecific variation into dental microwear texture analysis

Arman

Prowse

Couzens

et al. 2019

J. R. Soc. Interface.

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Dental microwear texture analysis (DMTA) quantifies microscopic scar or wear patterns left on teeth by different foods or extraneous ingested items such as grit. It can be a powerful tool for deducing the diets of extinct mammals. Here we investigate how intraspecific variation in the dental microwear of macropodids (kangaroos and their close relatives) can be used to maximize the dietary signal inferable from an inherently limited fossil record. We demonstrate significant intraspecific variation for every factor considered here for both scale-sensitive fractal analysis and International Organization for Standardization surface texture analysis variables. Intraspecific factors were then incorporated into interspecific (dietary) analyses through the use of Linear Mixed Effects modelling, incorporating Akaike's Information Criterion to compare models, and testing models through independent cross-validation. This revealed that for each DMTA variable only a small number of intraspecific factors need to be included to improve differentiation between species. Including specimen as a random factor accounted for stochastic inter-individual variation, and facet , incorporated effects of sampling location. Intraspecific effects of ecoregion, microscope, tooth position and wear were often but not universally important. We conclude that models of microwear data that include intraspecific variation can improve the resolution of dietary reconstructions.

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“…Nevertheless, there are few studies on the intra-specific variations in chewing mechanics 31 32 and in diet 33 34 in mammals other than human populations. Moreover, the application of DMTA to rodents is still in its infancy (SSFA 34 35 36 , STA 37 ). Finally, DMTA has never been applied to reconstruct chewing movements, most likely because SSFA does not compute texture direction.…”

mentioning

confidence: 99%

Tooth wear as a means to quantify intra-specific variations in diet and chewing movements

Calandra

Labonne

Schulz‐Kornas

et al. 2016

Sci Rep

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In mammals, tooth function, and its efficiency, depends both on the mechanical properties of the food and on chewing dynamics. These aspects have rarely been studied in combination and/or at the intra-specific level. Here we applied 3D dental surface texture analysis to a sample of field voles (Microtus agrestis) trapped from Finnish Lapland at different seasons and localities to test for inter-population variations. We also explored intra-individual variation in chewing dynamics by analysing two facets on the second upper molars. Our results confirm that the two localities have similar environments and that the voles feed on the same items there. On the other hand, the texture data suggest that diets are seasonally variable, probably due to varying concentrations of abrasives. Lastly, the textures on the buccal facets are more isotropic and their direction deviates more from the mesial chewing direction than the lingual facets. We interpret these results as reflecting food, rather than chewing, movements, where food particles are more guided on the lingual side of the molars. This has implications for the application of dental microwear analysis to fossils: only homologous facets can be compared, even when the molar row seems to constitute a functional unit.

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Tooth wear patterns in black rats (Rattus rattus) of Madagascar differ more in relation to human impact than to differences in natural habitats

Cited by 24 publications

References 45 publications

Three-dimensional tooth surface texture analysis on stall-fed and wild boars (Sus scrofa)

Three-dimensional tooth surface texture analysis on stall-fed and wild boars (Sus scrofa)

Incorporating intraspecific variation into dental microwear texture analysis

Tooth wear as a means to quantify intra-specific variations in diet and chewing movements

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