A COMPARISON OF TOOTH WEAR AND BREAKAGE IN RANCHO LA BREA SABERTOOTH CATS AND DIRE WOLVES ACROSS TIME
A COMPARISON OF TOOTH WEAR AND BREAKAGE IN RANCHO LA BREA SABERTOOTH CATS AND DIRE WOLVES ACROSS TIME
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DOI：
10.1080/02724630903413016
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发表时间：
2010-01-01
影响因子：
1.4
通讯作者：
Van Valkenburgh, Blaire
中科院分区：
文献类型：
--
作者：
Binder, Wendy J.;Van Valkenburgh, Blaire
与现代物种相比，在更新世晚期兰乔拉布雷亚焦油渗漏沉积物中保存的食肉动物显示出非常高的牙齿断裂率。在先前的研究中，我们检查了不同时期大劣犬的牙齿断裂、牙齿磨损和个体年龄，发现13 C。dirus（距今约15，000年）的牙齿磨损较重，牙齿断裂的频率约为年轻的Pit 61/67（约12，000 ybp）的三倍。在种群的年龄结构中没有发现显著差异，这表明这来自这两个时间段的摄食行为差异，可能是骨骼消耗。在这项研究中，我们将这项工作扩展到兰乔拉布雷亚剑齿猫，剑齿虎，一个hypercarnivore更专门的牙齿和喂养行为。我们观察了牙齿断裂、牙齿磨损和个体年龄。fatalis与C.从相似的时间间隔。与先前的研究一样，剑齿虎样本的年龄结构在不同的时间间隔之间没有差异。有趣的是，S。fatalis有一致的和更高的水平的牙齿断裂和表观平均年龄比C。dirus在任一位置，和牙齿磨损是类似的，观察到的磨损坑13样本的C。dirus。这可以证明S. fatalis消耗更多的骨，和/或S.致命个体年龄较大，有不同的相对牙本质沉积速率，或者可能反映了剑齿虎狭窄的牙齿更容易磨损和断裂。
The carnivores preserved in the late Pleistocene Rancho La Brea tar seep deposits display a remarkably high incidence of teeth broken in life as compared with modern species. In a previous study examining tooth breakage, tooth wear and individual age of Canis dirus over different periods in time, we found that Pit 13 C. dirus (about 15,000 years before present [ybp]) exhibited heavier tooth wear and fractured their teeth about three times more often than those of the younger Pit 61/67 (about 12,000 ybp). No significant difference was found in the age structure of the population, suggesting this came from differences in feeding behavior, likely bone consumption, at these two times. In this study, we extend this work to the Rancho La Brea sabertooth cat, Smilodon fatalis, a hypercarnivore with more specialized teeth and feeding behavior. We looked at tooth breakage, tooth wear, and individual age of S. fatalis compared with C. dirus from similar time intervals. As in the previous study, the age structure of the Smilodon samples did not differ between different time intervals. Interestingly, S. fatalis had consistent and higher levels of tooth breakage and apparent average age than C. dirus in either location, and tooth wear was similar to that observed in the more worn Pit 13 sample of C. dirus. This may demonstrate that S. fatalis was consuming more bone, and/or that S. fatalis individuals were older, had different relative dentine deposition rates, or might reflect the greater vulnerability of the sabercats' narrow teeth to wear and fracture.