Tooth row allometry in domestic rabbits and nondomestic lagomorphs: Evidence for a decoupling of body and tooth row size changes in evolutionary time.

IF 2.1
Ursina L Fasciati, Christine Böhmer, Stefanie Ohlerth, Marcus Clauss
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Abstract

In various domestic mammals, smaller breeds tend to have proportionally larger teeth, whereas this is not a universal trend across mammals. This suggests that body size can evolve faster than tooth size, leading to the prediction that tooth-body size scaling differs among closely related versus distant taxa. Here, we test this pattern in a new computed tomography (CT)Skriffer Utgitt au det Norske Vidensk-Akad scan dataset on 302 adult domestic rabbits of various breeds (maxilla and mandible) and compare this to 198 literature data from 20 nondomestic lagomorph species (maxilla only). Skull or mandible length served as body size proxies. The allometric scaling of the length of the cheek tooth row and the diastema, as well as the jaw width, with these proxies and with each other was investigated. In domestic rabbits, there is a negative allometric scaling between tooth row length and body size, that is, smaller animals have relatively larger teeth. Similar patterns appear within some wild lagomorph species, while across species, tooth row length and body size scale isometrically. These findings add to reports on allometric growth in domestic species. As the seeming advantage of disproportionately more chewing surface in smaller species is apparently lost over time, the postulate of an optimal tooth row size for an organismal design emerges, for which there is currently no theory. Possibly, veterinary experiences that dental problems are particularly frequent in small domestic breeds with relatively larger teeth might provide leverage for such a concept. Studies on the physiological effects of differences in relative tooth size between breeds are warranted.

家兔和非家兔牙形动物的齿列异速发育:进化时间中身体和齿列大小变化解耦的证据。
在各种家养哺乳动物中,体型较小的品种往往有比例较大的牙齿,而这并不是哺乳动物的普遍趋势。这表明身体大小的进化速度比牙齿大小的进化速度快,从而预测在近亲和远亲分类群之间,牙齿-身体大小的比例是不同的。在这里,我们在新的计算机断层扫描(CT)Skriffer Utgitt au det Norske Vidensk-Akad扫描数据集中对302只不同品种的成年家兔(上颌骨和下颌骨)进行了测试,并将其与来自20种非家家兔(仅上颌骨)的198个文献数据进行了比较。颅骨或下颌骨的长度可以作为身体大小的替代指标。研究了颊齿排长度和牙间隙长度以及下颌宽度与这些指标之间的异速缩放关系。家兔的牙齿排长与体型呈负异速缩放关系,即体型较小的动物牙齿相对较大。在一些野生lagomorph物种中也出现了类似的模式,而在物种之间,牙排长度和身体大小是等距的。这些发现补充了关于家养物种异速生长的报道。随着时间的推移,体型较小的物种在咀嚼表面上不成比例地增加的优势明显消失了,因此,有机体设计的最佳牙齿排大小的假设出现了,目前尚无理论。可能,兽医的经验表明,牙齿相对较大的小型家养品种的牙齿问题特别频繁,这可能为这种概念提供了杠杆作用。对不同品种之间相对牙齿大小差异的生理影响的研究是有必要的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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