A radiographic study of permanent molar development in wild Virunga mountain gorillas of known chronological age from Rwanda: KRALICK et al.
A radiographic study of permanent molar development in wild Virunga mountain gorillas of known chronological age from Rwanda: KRALICK et al.
复制标题
对卢旺达已知年龄的野生维龙加山地大猩猩永久磨牙发育的放射照相研究：KRALICK 等人。
DOI：
10.1002/ajpa.23192
复制
发表时间：
2017
影响因子：
2.8
通讯作者：
Bromage, Timothy G.
中科院分区：
文献类型：
--
作者：
Kralick, Alexandra E.;Loring Burgess, M.;Glowacka, Halszka;Arbenz-Smith, Keely;McGrath, Kate;Ruff, Christopher B.;Chan, King Chong;Cranfield, Michael R.;Stoinski, Tara S.;Bromage, Timothy G.
目标虽然牙齿发育对于生活史研究很重要，但来自野生已知年龄类人猿的数据却很少。我们使用在卢旺达发现的已知年龄的骨骼样本报告了野生维龙加山地大猩猩牙齿发育的首次射线照相检查。材料和方法在 43 个人（0.0-14.94 岁）中，我们收集了下颌磨牙的射线照片，并在可能的情况下进行了锥形束 CT 扫描。使用两个已建立的分期系统评估磨牙冠和牙根的钙化状态，并使用多项式回归生成年龄预测方程。将结果与已知年龄的圈养黑猩猩和野生黑猩猩的现有数据进行比较。结果山地大猩猩通常落在报告的圈养黑猩猩分布范围内或超过它们，在同等的放射照相发育阶段表现出较大的年龄。差异反映了与圈养黑猩猩相比，山地大猩猩的第二磨牙牙冠发育延迟启动和/或延长持续时间，以及第一和第二磨牙根发育延长。然而，与野生黑猩猩相比，磨牙根发育持续时间的差异不太明显。讨论尽管样本有限，我们的研究结果扩展了大猩猩磨牙形成时间的放射照相估计的已知变异范围，并提供了一种基于野生标本的新年龄预测技术。然而，与黑猩猩相比，山地大猩猩在磨牙形成的放射学评估中并没有出现加速，就像它们对其他生活史特征的评估一样。未来的研究应该旨在解决物种差异、野生与圈养环境和/或采样现象对此处观察到的模式的影响，更一般地说，它们与牙齿大小、萌出时间和发育生活史的变化之间的关系。
ObjectivesWhile dental development is important to life history investigations, data from wild known‐aged great apes are scarce. We report on the first radiographic examination of dental development in wild Virunga mountain gorillas, using known‐age skeletal samples recovered in Rwanda.Materials and methodsIn 43 individuals (0.0–14.94 years), we collected radiographs of mandibular molars, and where possible, cone beam CT scans. Molar crown and root calcification status was assessed using two established staging systems, and age prediction equations generated using polynomial regression. Results were compared to available data from known‐age captive and wild chimpanzees.ResultsMountain gorillas generally fell within reported captive chimpanzee distributions or exceeded them, exhibiting older ages at equivalent radiographic stages of development. Differences reflect delayed initiation and/or an extended duration of second molar crown development, and extended first and second molar root development, in mountain gorillas compared to captive chimpanzees. However, differences in the duration of molar root development were less evident compared to wild chimpanzees.DiscussionDespite sample limitations, our findings extend the known range of variation in radiographic estimates of molar formation timing in great apes, and provide a new age prediction technique based on wild specimens. However, mountain gorillas do not appear accelerated in radiographic assessment of molar formation compared to chimpanzees, as they are for other life history traits. Future studies should aim to resolve the influence of species differences, wild versus captive environments, and/or sampling phenomena on patterns observed here, and more generally, how they relate to variation in tooth size, eruption timing, and developmental life history.