Assessing molar wear in narrow-headed voles as a proxy for diet and habitat in a changing Arctic
Assessing molar wear in narrow-headed voles as a proxy for diet and habitat in a changing Arctic
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DOI：
10.1007/s42991-020-00079-x
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发表时间：
2020-11
影响因子：
1.6
通讯作者：
P. Ungar;N. Sokolova;Jacob Purifoy;Ivan A. Fufachev;A. Sokolov
中科院分区：
文献类型：
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作者：
P. Ungar;N. Sokolova;Jacob Purifoy;Ivan A. Fufachev;A. Sokolov
本文研究了啮齿动物中尺度牙齿磨损(中耳、碎屑、小平面和其他磨损属性)作为北极栖息地的替代指标的可能性。它介绍了一项对窄头田鼠的初步研究，这些田鼠在俄罗斯北极亚马尔半岛生态分区纬度梯度的三个地点进行。这些地点包括森林-冻土带交错带的哈尔普，低北极的埃尔库塔，以及低北极和高北极交界处的萨贝塔。共有117个样本被纳入，8个变量被用来表征中尺度牙齿磨损。结果表明，不同地点之间存在显著差异，表明这些变量可以区分不同亚区的种群。Kharp的牙齿磨损最平坦，而Sabetta的M1咬合减轻和牙本质暴露最多。这些结果与已发表的关于圈养田鼠的实验工作是一致的，并得到了解释。此外，Kharp样本的M1牙冠最高，而Sabetta的M1牙冠垂直植入最多。按样本纬度区分数值的总体方向趋势表明，准牙齿啮齿动物(那些拥有开放的、不断生长的磨牙的啮齿动物)的中尺度磨损反映了食物磨损性的变化，进而可能对跟踪北极的栖息地和生态变化有价值。
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.